西南三江临沧地体澜沧岩群火山岩成因与构造意义

doi:10.19657/j.geoscience.1000-8527.2024.032

摘要/Abstract

摘要：

临沧地体是重建西南三江原特提斯构造演化的关键,但其构造属性存在争议,作为地体基底的澜沧岩群是解决该问题的关键。本文选择临沧地体澜沧岩群正层型剖面为研究对象,对其中惠民岩组的变中基性火山岩进行锆石U-Pb年代学和全岩元素地球化学组成分析。2件钠长绿泥片岩的岩浆锆石²⁰⁶Pb/²³⁸U加权平均年龄为(457±2) Ma和(455±2) Ma,指示晚奥陶世岩浆作用。岩石地球化学特征显示,22件绿泥石片岩的原岩为低K拉斑玄武岩系列,6件钠长绿泥片岩的原岩为高K钙碱-钾玄岩系列的玄武安山岩,两者都表现出大离子亲石元素的强烈富集和高场强元素的亏损,为典型弧火山岩。上述证据指示惠民岩浆弧形成于奥陶纪—志留纪期间原特提斯洋向思茅地块的俯冲消减。综合分析认为,临沧地体可能不是一个具有前寒武纪基底的独立地块,而是代表了原—古特提斯洋在思茅地块大陆边缘俯冲形成的陆缘弧地体。

关键词: 原特提斯, 岩浆弧, 临沧地体, 澜沧岩群

Abstract:

Studying the Lincang terrane is essential to understand the tectonic evolution of the Proto-Tethys in the Sanjiang region of Southwest China.However, there have been ongoing debates about its tectonic characte-ristics.This study focuses on the Lancang Group, which serves as the basement of the terrane.Our study presents zircon U-Pb chronology and whole-rock elemental composition of altered metavolcanic rocks in the area.The zircon U-Pb dating results indicate that these rocks formed during the Late Ordovician period, specifically at (457±2) Ma and (455±2) Ma.The protoliths of the 22 chlorite schists are from the low-potassium tholeiite series, while the protoliths of the six albite chlorite schists are basaltic-andesites from the high-potassium calc-alkaline-potassium basalt series.These rocks share similar characteristics with typical arc volcanic features, such as strong enrichment of light rare earth elements (LREEs), large-ion lithophile elements (LILEs), and negative anomalies of high field strength elements (HFSE).This evidence supports the idea that the Huimin magmatism was formed through the subduction of the Proto-Tethys Ocean to the Simao Block during the Ordovician-Silurian period.Therefore, we propose that the Lincang terrane may not be a distinct block with Precambrian basement, but rather a continental arc that formed through the subduction of the Proto- and Paleo-Tethys at the margin of the Simao Block.

Key words: Proto-Tethys, magmatic arc, Lincang terrane, Lancang Group

中图分类号:

P542
P597.3

张斌辉, 王宏, 牛浩斌, 于远山, 陈敏华. 西南三江临沧地体澜沧岩群火山岩成因与构造意义[J]. 现代地质, 2024, 38(04): 1162-1176.

ZHANG Binhui, WANG Hong, NIU Haobin, YU Yuanshan, CHEN Minhua. Genesis and Tectonic Significance of Volcanic Rocks from the Lancang Group in the Lincang Terrane, Sanjiang Region, Southwest China[J]. Geoscience, 2024, 38(04): 1162-1176.

图/表 12

图1 昌宁—孟连带地质简图(a)、勐海西定地区地质简图(b)及澜沧岩群含铁建造柱状示意图(c)

Fig.1 Simplified geological maps of Changning-Menglian belt(a), simplified geological maps of Xiding area in Menghai (b)and schematic graphic of the iron formation stratigraphy for the Lancang Group(c)

图2 西定地区澜沧岩群的露头和镜下照相 (a)条带状铁建造;(b)绿泥片岩和磁铁石英岩伴生;(c)炭质片岩;(d)大理岩;(e)条带状磁铁石英岩;(f)绿泥石片岩;(g)钠长绿泥片岩;(h) 绿泥石片岩镜下照片(-)单偏光(+)正交;(i) 钠长绿泥片岩镜下照片(-)单偏光(+)正交;(j)PM03剖面及采样位置; Chl.绿泥石; Ab.钠长石

Fig.2 Outcrops and micrographs of the Lancang Group in Xiding area

表1 西定地区澜沧岩群变火山岩的LA-ICP-MS锆石U-Pb年龄数据

Table 1 LA-ICP-MS zircon U-Pb age data for the metavolcanic rocks of the Lancang Group in Xiding area

测点号	含量(10^-6)			Th /U	同位素比值			年龄(Ma)			谐和度 (%)
测点号	Pb	Th	U	Th /U	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	谐和度 (%)
D210-1	66	189	345	0.5	0.0539(0.0022)	0.5170(0.0204)	0.0698(0.0010)	365(91)	423(14)	435(6)	97
D210-2	44	142	154	0.9	0.0600(0.0029)	0.6839(0.0327)	0.0831(0.0015)	611(106)	529(20)	514(9)	97
D210-3	292	1178	960	1.2	0.0574(0.0015)	0.5743(0.0161)	0.0723(0.0009)	506(55)	461(10)	450(6)	97
D210-4	234	850	863	1.0	0.0573(0.0016)	0.5837(0.0154)	0.0742(0.0010)	502(59)	467(10)	461(6)	98
D210-5	73	200	211	0.9	0.0715(0.0032)	0.7159(0.0345)	0.0729(0.0015)	972(91)	548(20)	453(9)	81
D210-6	307	456	523	0.9	0.0743(0.0018)	1.6540(0.0454)	0.1610(0.0024)	1050(44)	991(17)	962(13)	97
D210-7	59	215	216	1.0	0.0542(0.0025)	0.5452(0.0246)	0.0738(0.0011)	376(73)	442(16)	459(7)	96
D210-8	208	716	875	0.8	0.0552(0.0016)	0.5555(0.0161)	0.0730(0.0009)	420(65)	449(11)	454(6)	98
D210-9	231	1066	449	2.4	0.0584(0.0019)	0.5997(0.0203)	0.0743(0.0010)	546(72)	477(13)	462(6)	96
D210-10	98	431	239	1.8	0.0549(0.0024)	0.5600(0.0235)	0.0746(0.0011)	409(100)	452(15)	464(6)	97
D210-11	165	619	564	1.1	0.0630(0.0022)	0.6221(0.0211)	0.0717(0.0011)	709(77)	491(13)	446(6)	90
D210-12	57	197	213	0.9	0.0564(0.0025)	0.5578(0.0235)	0.0724(0.0011)	478(98)	450(15)	451(7)	99
D210-13	138	589	294	2.0	0.0547(0.0021)	0.5603(0.0217)	0.0749(0.0012)	398(87)	452(14)	466(7)	96
D210-14	210	734	821	0.9	0.0593(0.0015)	0.6019(0.0153)	0.0737(0.0009)	576(52)	478(10)	458(5)	95
D210-15	135	294	163	1.8	0.0691(0.0025)	1.4443(0.0553)	0.1517(0.0025)	902(71)	907(23)	911(14)	99
D210-16	70	273	239	1.1	0.0832(0.0038)	0.8502(0.0404)	0.0742(0.0011)	1273(86)	625(22)	461(7)	69
D210-17	71	263	278	0.9	0.0570(0.0022)	0.5797(0.0221)	0.0742(0.0011)	500(53)	464(14)	462(7)	99
D210-18	93	352	349	1.0	0.0615(0.0024)	0.5804(0.0205)	0.0694(0.0010)	657(83)	465(13)	432(6)	92
D210-19	87	309	335	0.9	0.0619(0.0020)	0.6280(0.0204)	0.0739(0.0011)	672(70)	495(13)	460(6)	92
D210-20	149	544	557	1.0	0.0618(0.0019)	0.6057(0.0193)	0.0713(0.0009)	665(67)	481(12)	444(5)	92
D210-21	89	109	331	0.3	0.0636(0.0020)	1.1534(0.0365)	0.1320(0.0018)	728(67)	779(17)	799(11)	97
D210-22	90	266	444	0.6	0.0572(0.0020)	0.5816(0.0202)	0.0745(0.0012)	502(78)	465(13)	463(7)	99
D210-23	193	733	644	1.1	0.0566(0.0019)	0.5923(0.0202)	0.0753(0.0011)	476(40)	472(13)	468(7)	99
D210-24	123	596	325	1.8	0.0549(0.0021)	0.5495(0.0205)	0.0732(0.0011)	409(90)	445(13)	455(7)	97
D210-25	60	156	184	0.9	0.0930(0.0046)	0.9237(0.0514)	0.0711(0.0013)	1489(98)	664(27)	442(8)	59
D280-1	98	224	380	0.6	0.0657(0.0023)	0.9694(0.0342)	0.1075(0.0019)	798(79)	688(18)	658(11)	95
D280-2	46	96	240	0.4	0.0599(0.0032)	0.6000(0.0292)	0.0744(0.0014)	598(115)	477(19)	462(8)	96
D280-3	96	230	408	0.6	0.0541(0.0021)	0.6121(0.0249)	0.0816(0.0013)	376(89)	485(16)	505(8)	95
D280-4	173	430	804	0.5	0.0564(0.0018)	0.5837(0.0185)	0.0748(0.0011)	478(70)	467(12)	465(6)	99
D280-5	35	68	130	0.5	0.0593(0.0043)	0.6391(0.0396)	0.0818(0.0019)	589(157)	502(25)	507(11)	99
D280-6	129	344	654	0.5	0.0537(0.0020)	0.5379(0.0203)	0.0723(0.0011)	367(83)	437(13)	450(6)	97
D280-7	77	188	375	0.5	0.0632(0.0031)	0.6872(0.0355)	0.0786(0.0016)	715(102)	531(21)	488(10)	91
D280-8	290	700	1008	0.7	0.0799(0.0040)	0.8107(0.0466)	0.0714(0.0011)	1194(104)	603(26)	445(7)	69
D280-9	170	436	738	0.6	0.0584(0.0017)	0.5856(0.0182)	0.0727(0.0010)	543(63)	468(12)	452(6)	96
D280-10	92	252	252	1.0	0.0500(0.0030)	0.4299(0.0271)	0.0629(0.0022)	195(136)	363(19)	393(13)	92
D280-11	134	343	586	0.6	0.0579(0.0019)	0.5914(0.0207)	0.0737(0.0010)	524(72)	472(13)	459(6)	97
D280-12	67	160	316	0.5	0.0610(0.0026)	0.6605(0.0274)	0.0791(0.0012)	639(91)	515(17)	491(7)	95
D280-13	127	193	407	0.5	0.1254(0.0090)	1.3451(0.1098)	0.0737(0.0013)	2035(132)	865(48)	458(8)	38
D280-14	133	342	672	0.5	0.0586(0.0020)	0.5756(0.0186)	0.0716(0.0011)	554(77)	462(12)	446(7)	96
D280-15	49	115	197	0.6	0.0537(0.0039)	0.4541(0.0256)	0.0623(0.0023)	367(168)	380(18)	390(14)	97
D280-16	98	264	388	0.7	0.0597(0.0028)	0.6115(0.0255)	0.0752(0.0013)	591(101)	484(16)	467(8)	96
D280-17	149	393	699	0.6	0.0561(0.0018)	0.5782(0.0201)	0.0747(0.0010)	454(69)	463(13)	464(6)	99
D280-18	21	44	88	0.5	0.0573(0.0051)	0.5729(0.0390)	0.0806(0.0019)	502(196)	460(25)	500(11)	91
测点号	含量(10^-6)			Th /U	同位素比值			年龄(Ma)			谐和度 (%)
测点号	Pb	Th	U	Th /U	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	谐和度 (%)
D280-19	122	307	477	0.6	0.0560(0.0023)	0.5651(0.0220)	0.0729(0.0012)	454(89)	455(14)	454(7)	99
D280-20	157	271	1159	0.2	0.0585(0.0016)	0.5818(0.0176)	0.0717(0.0010)	546(61)	466(11)	447(6)	95
D280-21	188	483	602	0.8	0.0625(0.0025)	0.6369(0.0257)	0.0736(0.0011)	700(82)	500(16)	458(6)	91
D280-22	101	199	544	0.4	0.0655(0.0029)	0.6994(0.0374)	0.0752(0.0012)	791(94)	538(22)	467(7)	85
D280-23	129	314	687	0.5	0.0568(0.0021)	0.5568(0.0203)	0.0710(0.0012)	487(49)	449(13)	442(7)	98
D280-24	176	495	743	0.7	0.0576(0.0019)	0.5631(0.0189)	0.0714(0.0011)	517(72)	454(12)	444(7)	97
D280-25	119	278	570	0.5	0.0641(0.0024)	0.6244(0.0219)	0.0711(0.0010)	746(79)	493(14)	443(6)	89

表1 西定地区澜沧岩群变火山岩的LA-ICP-MS锆石U-Pb年龄数据

Table 1 LA-ICP-MS zircon U-Pb age data for the metavolcanic rocks of the Lancang Group in Xiding area

测点号	含量(10^-6)			Th /U	同位素比值			年龄(Ma)			谐和度 (%)
测点号	Pb	Th	U	Th /U	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	谐和度 (%)
D210-1	66	189	345	0.5	0.0539(0.0022)	0.5170(0.0204)	0.0698(0.0010)	365(91)	423(14)	435(6)	97
D210-2	44	142	154	0.9	0.0600(0.0029)	0.6839(0.0327)	0.0831(0.0015)	611(106)	529(20)	514(9)	97
D210-3	292	1178	960	1.2	0.0574(0.0015)	0.5743(0.0161)	0.0723(0.0009)	506(55)	461(10)	450(6)	97
D210-4	234	850	863	1.0	0.0573(0.0016)	0.5837(0.0154)	0.0742(0.0010)	502(59)	467(10)	461(6)	98
D210-5	73	200	211	0.9	0.0715(0.0032)	0.7159(0.0345)	0.0729(0.0015)	972(91)	548(20)	453(9)	81
D210-6	307	456	523	0.9	0.0743(0.0018)	1.6540(0.0454)	0.1610(0.0024)	1050(44)	991(17)	962(13)	97
D210-7	59	215	216	1.0	0.0542(0.0025)	0.5452(0.0246)	0.0738(0.0011)	376(73)	442(16)	459(7)	96
D210-8	208	716	875	0.8	0.0552(0.0016)	0.5555(0.0161)	0.0730(0.0009)	420(65)	449(11)	454(6)	98
D210-9	231	1066	449	2.4	0.0584(0.0019)	0.5997(0.0203)	0.0743(0.0010)	546(72)	477(13)	462(6)	96
D210-10	98	431	239	1.8	0.0549(0.0024)	0.5600(0.0235)	0.0746(0.0011)	409(100)	452(15)	464(6)	97
D210-11	165	619	564	1.1	0.0630(0.0022)	0.6221(0.0211)	0.0717(0.0011)	709(77)	491(13)	446(6)	90
D210-12	57	197	213	0.9	0.0564(0.0025)	0.5578(0.0235)	0.0724(0.0011)	478(98)	450(15)	451(7)	99
D210-13	138	589	294	2.0	0.0547(0.0021)	0.5603(0.0217)	0.0749(0.0012)	398(87)	452(14)	466(7)	96
D210-14	210	734	821	0.9	0.0593(0.0015)	0.6019(0.0153)	0.0737(0.0009)	576(52)	478(10)	458(5)	95
D210-15	135	294	163	1.8	0.0691(0.0025)	1.4443(0.0553)	0.1517(0.0025)	902(71)	907(23)	911(14)	99
D210-16	70	273	239	1.1	0.0832(0.0038)	0.8502(0.0404)	0.0742(0.0011)	1273(86)	625(22)	461(7)	69
D210-17	71	263	278	0.9	0.0570(0.0022)	0.5797(0.0221)	0.0742(0.0011)	500(53)	464(14)	462(7)	99
D210-18	93	352	349	1.0	0.0615(0.0024)	0.5804(0.0205)	0.0694(0.0010)	657(83)	465(13)	432(6)	92
D210-19	87	309	335	0.9	0.0619(0.0020)	0.6280(0.0204)	0.0739(0.0011)	672(70)	495(13)	460(6)	92
D210-20	149	544	557	1.0	0.0618(0.0019)	0.6057(0.0193)	0.0713(0.0009)	665(67)	481(12)	444(5)	92
D210-21	89	109	331	0.3	0.0636(0.0020)	1.1534(0.0365)	0.1320(0.0018)	728(67)	779(17)	799(11)	97
D210-22	90	266	444	0.6	0.0572(0.0020)	0.5816(0.0202)	0.0745(0.0012)	502(78)	465(13)	463(7)	99
D210-23	193	733	644	1.1	0.0566(0.0019)	0.5923(0.0202)	0.0753(0.0011)	476(40)	472(13)	468(7)	99
D210-24	123	596	325	1.8	0.0549(0.0021)	0.5495(0.0205)	0.0732(0.0011)	409(90)	445(13)	455(7)	97
D210-25	60	156	184	0.9	0.0930(0.0046)	0.9237(0.0514)	0.0711(0.0013)	1489(98)	664(27)	442(8)	59
D280-1	98	224	380	0.6	0.0657(0.0023)	0.9694(0.0342)	0.1075(0.0019)	798(79)	688(18)	658(11)	95
D280-2	46	96	240	0.4	0.0599(0.0032)	0.6000(0.0292)	0.0744(0.0014)	598(115)	477(19)	462(8)	96
D280-3	96	230	408	0.6	0.0541(0.0021)	0.6121(0.0249)	0.0816(0.0013)	376(89)	485(16)	505(8)	95
D280-4	173	430	804	0.5	0.0564(0.0018)	0.5837(0.0185)	0.0748(0.0011)	478(70)	467(12)	465(6)	99
D280-5	35	68	130	0.5	0.0593(0.0043)	0.6391(0.0396)	0.0818(0.0019)	589(157)	502(25)	507(11)	99
D280-6	129	344	654	0.5	0.0537(0.0020)	0.5379(0.0203)	0.0723(0.0011)	367(83)	437(13)	450(6)	97
D280-7	77	188	375	0.5	0.0632(0.0031)	0.6872(0.0355)	0.0786(0.0016)	715(102)	531(21)	488(10)	91
D280-8	290	700	1008	0.7	0.0799(0.0040)	0.8107(0.0466)	0.0714(0.0011)	1194(104)	603(26)	445(7)	69
D280-9	170	436	738	0.6	0.0584(0.0017)	0.5856(0.0182)	0.0727(0.0010)	543(63)	468(12)	452(6)	96
D280-10	92	252	252	1.0	0.0500(0.0030)	0.4299(0.0271)	0.0629(0.0022)	195(136)	363(19)	393(13)	92
D280-11	134	343	586	0.6	0.0579(0.0019)	0.5914(0.0207)	0.0737(0.0010)	524(72)	472(13)	459(6)	97
D280-12	67	160	316	0.5	0.0610(0.0026)	0.6605(0.0274)	0.0791(0.0012)	639(91)	515(17)	491(7)	95
D280-13	127	193	407	0.5	0.1254(0.0090)	1.3451(0.1098)	0.0737(0.0013)	2035(132)	865(48)	458(8)	38
D280-14	133	342	672	0.5	0.0586(0.0020)	0.5756(0.0186)	0.0716(0.0011)	554(77)	462(12)	446(7)	96
D280-15	49	115	197	0.6	0.0537(0.0039)	0.4541(0.0256)	0.0623(0.0023)	367(168)	380(18)	390(14)	97
D280-16	98	264	388	0.7	0.0597(0.0028)	0.6115(0.0255)	0.0752(0.0013)	591(101)	484(16)	467(8)	96
D280-17	149	393	699	0.6	0.0561(0.0018)	0.5782(0.0201)	0.0747(0.0010)	454(69)	463(13)	464(6)	99
D280-18	21	44	88	0.5	0.0573(0.0051)	0.5729(0.0390)	0.0806(0.0019)	502(196)	460(25)	500(11)	91
测点号	含量(10^-6)			Th /U	同位素比值			年龄(Ma)			谐和度 (%)
测点号	Pb	Th	U	Th /U	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	谐和度 (%)
D280-19	122	307	477	0.6	0.0560(0.0023)	0.5651(0.0220)	0.0729(0.0012)	454(89)	455(14)	454(7)	99
D280-20	157	271	1159	0.2	0.0585(0.0016)	0.5818(0.0176)	0.0717(0.0010)	546(61)	466(11)	447(6)	95
D280-21	188	483	602	0.8	0.0625(0.0025)	0.6369(0.0257)	0.0736(0.0011)	700(82)	500(16)	458(6)	91
D280-22	101	199	544	0.4	0.0655(0.0029)	0.6994(0.0374)	0.0752(0.0012)	791(94)	538(22)	467(7)	85
D280-23	129	314	687	0.5	0.0568(0.0021)	0.5568(0.0203)	0.0710(0.0012)	487(49)	449(13)	442(7)	98
D280-24	176	495	743	0.7	0.0576(0.0019)	0.5631(0.0189)	0.0714(0.0011)	517(72)	454(12)	444(7)	97
D280-25	119	278	570	0.5	0.0641(0.0024)	0.6244(0.0219)	0.0711(0.0010)	746(79)	493(14)	443(6)	89

图3 西定地区澜沧岩群变火山岩的锆石阴极发光图像

Fig.3 Cathodoluminescence (CL) images of zircons for the metavolcanic rocks of the Lancang Group in Xiding area

图4 西定地区澜沧岩群变火山岩的锆石U-Pb年龄谐和图(a—d)和加权平均年龄图(e)(f)

Fig.4 Zircon U-Pb concordia (a—d) and weighted mean age plots (e)(f) for the metavolcanic rocks of the Lancang Group in Xiding area

表2 西定地区澜沧岩群变火山岩的主量(%)和微量元素(10-6)测试数据

Table 2 Major elements (%) and trace elements (10-6) abundances for the metavolcanic rocks of the Lancang Group in Xiding area

岩性	样品编号	SiO₂	TiO₂		Al₂O₃		Fe₂ $O 3 T$		MnO		MgO		CaO		Na₂O		K₂O		P₂O₅		LOI		Mg^#		Sc		V		Cr			Co			Ni			Rb			Ba			Th			U
绿泥片岩	PM003-16YQ2	50.4	0.75		14.60		16.4		0.59		14.10		2.92		0.02		0.08		0.06		8.71		64.7		27.4		94		616			69.0			311			1.89			33.6			0.15			0.04
	PM003-17YQ1	47.9	0.91		17.4		11.2		0.24		9.47		10.00		2.72		0.12		0.07		6.26		64.9		40.1		211		316			51.7			161			3.61			76.0			0.26			0.06
	PM003-17YQ2	47.9	0.87		17.3		11.1		0.25		9.68		9.93		2.65		0.16		0.07		6.54		65.4		38.1		203		295			50.8			159			4.99			94.1			0.26			0.06
	PM003-18YQ1	49.5	1.14		16.2		11.7		0.35		8.25		9.47		0.16		3.01		0.11		14.60		58.2		35.3		213		225			39.5			111			76.10			1012			0.37			0.09
	PM003-18YQ2	48.4	1.14		17.1		12.6		0.31		7.90		9.09		0.20		3.16		0.11		14.60		55.3		38.6		223		239			50.9			119			79.00			1045			0.39			0.08
	D0270YQ1	47.4	1.45		18.3		14.0		0.34		9.43		4.44		3.30		1.28		0.12		7.41		59.2		53.1		311		293			68.3			154			26.70			292			0.43			0.14
	D0270YQ2	45.1	1.59		19.0		16.5		0.37		10.90		2.37		2.43		1.55		0.16		6.78		58.8		60.0		332		309			68.6			147			33.80			364			0.86			0.16
	D0270YQ3	49.5	1.42		18.5		9.7		0.26		7.76		7.50		5.29		0.04		0.09		7.40		63.2		51.0		275		301			49.6			138			0.97			14.3			0.66			0.13
	D0270YQ4	49.5	1.37		17.8		11.1		0.23		8.12		7.51		4.00		0.34		0.09		7.10		61.2		49.0		275		293			50.3			143			21.70			721			0.62			0.14
	D0270YQ5	51.0	1.37		17.9		11.2		0.23		7.12		7.70		3.28		0.10		0.09		6.29		58.2		47.8		259		296			49.3			143			5.91			23.0			0.62			0.15
	D0270YQ6	51.2	1.39		17.9		11.1		0.20		10.40		3.18		4.40		0.16		0.09		6.91		66.9		49.1		262		294			47.0			142			9.30			224			0.62			0.15
	D0282YQ1	47.3	1.34		17.2		12.5		0.20		10.50		7.87		2.92		0.03		0.11		4.26		65.3		46.6		284		255			51.8			132			0.76			57.1			0.70			0.17
	D0282YQ2	45.1	1.42		18.3		12.8		0.21		10.70		8.79		2.57		0.04		0.11		4.48		65.0		48.9		319		286			49.6			157			0.95			62.6			0.74			0.17
	D0283YQ1	46.7	1.75		14.8		14.7		0.21		9.66		9.76		2.14		0.11		0.17		3.26		59.6		54.9		332		282			35.6			59.0			2.06			658			0.57			0.12
	D0283YQ2	48.0	1.81		14.8		14.1		0.22		9.60		8.34		2.89		0.11		0.17		3.47		60.6		55.5		339		284			42.5			63.5			1.93			488			0.56			0.12
	D0283YQ3	48.5	1.68		14.7		13.7		0.21		9.36		8.53		3.03		0.11		0.18		3.35		60.8		53.5		320		307			38.8			64.4			1.95			513			0.61			0.13
	D0283YQ4	48.5	1.38		16.0		12.1		0.21		8.92		10.10		2.42		0.14		0.19		3.36		62.4		43.6		244		231			32.8			95.6			2.85			516			0.65			0.13
	D0283YQ5	49.3	1.84		13.7		14.4		0.21		8.68		9.29		2.40		0.07		0.17		3.22		57.7		52.3		335		209			32.4			48.3			1.16			314			0.53			0.12
	D0283YQ6	46.3	1.93		14.9		15.3		0.23		9.92		8.73		2.49		0.07		0.17		3.73		59.3		58.7		376		243			44.0			57.9			1.28			478			0.59			0.13
	L0001-YQ2	47.3	1.65		29.8		8.5		0.04		2.19		0.37		0.30		9.31		0.49		5.49		36.2		20.9		238		54			18.7			43.1			359.00			2361			27.60			5.07
	D0280YQ5	45.4	1.70		16.9		14.5		0.21		10.30		8.31		2.51		0.06		0.15		4.56		61.3		52.9		335		287			39.6			101.0			1.18			266			0.51			0.12
	D0280YQ6	50.1	2.03		19.1		15.0		0.15		11.30		0.22		1.58		0.30		0.21		6.45		62.1		54.4		327		268			56.4			140.0			10.8			80.1			0.71			0.23
钠长绿泥片岩	PM003-16YQ1	61.7	0.51		9.6		15.8		0.41		9.02		2.75		0.02		0.01		0.16		6.48		55.4		21.8		100			354			56.2			201			0.55			13			0.2		0.04
	L0001-YQ1	61.6	1.14		19.7		9.3		0.10		2.13		0.13		0.16		5.52		0.19		4.05		33.8		16.6		167			49			22.0			69.0			215			1763			17.4		3.54
	D0210YQ1	59.8	0.73		19.1		9.9		0.09		2.25		1.45		3.10		3.28		0.26		3.76		33.6		26.0		113			476			15.1			148.0			151			1637			26.6		4.00
	D0210YQ2	66.0	0.64		15.7		6.6		0.13		2.74		1.42		3.56		3.09		0.19		2.86		48.4		14.8		61			202			15.9			65.7			115			1110			21.5		3.44
	D0280YQ1	60.4	0.90		19.2		7.6		0.07		5.08		0.04		0.07		6.56		0.09		4.42		59.7		20.3		138			325			21.7			88.6			242			1399			13.8		2.70
	D0280YQ2	58.0	0.90		19.8		8.6		0.09		6.00		0.11		0.65		5.69		0.18		4.84		60.7		20.5		133			303			19.1			73.5			214			1186			18.2		3.28
岩性	样品编号	Nb		Ta		La		Ce		Pb		Pr		Sr		Nd		Zr		Hf		Sm		Eu		Gd		Tb			Dy			Y			Ho			Er			Tm			Yb		Lu
绿泥片岩	PM003-16YQ2	1.32		0.08		1.18		2.99		0.77		0.40		50.9		1.79		47.6		1.15		0.61		0.27		0.78		0.14			1.00			5.9			0.22			0.65			0.10			0.76		0.13
	PM003-17YQ1	1.25		0.08		2.24		6.50		14.80		1.11		284.0		6.07		45.9		1.26		1.89		0.76		2.49		0.44			2.84			15.8			0.59			1.74			0.25			1.65		0.25
	PM003-17YQ2	1.23		0.08		2.19		6.38		13.00		1.08		274.0		5.66		44.5		1.16		1.84		0.79		2.35		0.42			2.69			15.3			0.56			1.74			0.24			1.61		0.23
	PM003-18YQ1	1.61		0.10		3.25		9.31		2.88		1.62		82.0		8.09		61.5		1.49		2.43		0.95		3.21		0.53			3.30			17.6			0.66			1.88			0.27			1.71		0.26
	PM003-18YQ2	1.88		0.13		3.34		9.53		2.61		1.62		75.2		8.45		63.7		1.53		2.64		0.99		3.43		0.62			4.06			23.2			0.86			2.50			0.36			2.28		0.33
	D0270YQ1	1.67		0.10		2.90		9.16		1.57		1.59		51.2		8.10		79.9		2.12		2.53		0.99		3.44		0.59			3.68			20.4			0.73			2.28			0.33			2.18		0.31
	D0270YQ2	2.07		0.14		3.23		9.99		1.94		1.68		32.1		8.50		94.5		2.32		2.71		0.96		3.50		0.61			4.00			22.1			0.83			2.58			0.38			2.74		0.42
	D0270YQ3	1.65		0.11		3.77		11.50		1.76		1.95		96.8		10.40		78.6		2.05		3.23		1.16		4.05		0.67			4.48			23.0			0.89			2.52			0.37			2.37		0.35
	D0270YQ4	1.62		0.11		2.77		8.98		4.71		1.71		223.0		8.72		78.0		2.03		2.98		1.22		3.97		0.66			4.56			24.7			0.95			2.84			0.43			2.79		0.43
	D0270YQ5	1.61		0.11		2.63		8.38		4.99		1.58		224.0		8.57		77.9		2.04		2.87		1.09		3.70		0.73			4.52			27.0			0.91			2.83			0.42			2.67		0.40
	D0270YQ6	1.69		0.12		1.61		5.31		3.33		0.93		39.3		5.07		81.0		2.13		1.74		0.78		2.75		0.50			3.57			19.6			0.75			2.33			0.35			2.33		0.34
	D0282YQ1	2.23		0.14		4.43		12.40		43.10		2.14		249.0		10.70		90.3		2.07		3.22		1.30		4.33		0.74			4.65			28.0			0.95			2.91			0.41			2.63		0.38
	D0282YQ2	2.17		0.15		4.19		12.00		7.94		2.05		291.0		10.70		94.4		2.13		3.21		1.28		4.51		0.77			4.95			30.0			1.00			3.02			0.44			2.75		0.41
	D0283YQ1	2.91		0.19		5.00		15.20		1.74		2.61		336.0		13.50		126.0		2.93		4.32		1.55		5.65		0.99			6.01			35.2			1.17			3.54			0.51			3.20		0.48
	D0283YQ2	3.10		0.20		5.01		15.20		2.44		2.68		238.0		14.00		129.0		3.04		4.31		1.54		5.79		0.99			6.19			36.2			1.30			3.75			0.55			3.51		0.51
	D0283YQ3	3.05		0.20		4.96		15.20		1.95		2.75		236.0		13.60		134.0		3.00		4.17		1.48		5.81		0.93			6.05			35.7			1.23			3.68			0.54			3.41		0.52
	D0283YQ4	3.14		0.22		5.48		16.70		2.35		2.84		319.0		14.70		136.0		3.09		4.44		1.58		5.95		1.04			6.36			37.2			1.25			3.77			0.55			3.42		0.52
	D0283YQ5	3.11		0.23		5.01		14.90		2.05		2.73		261.0		14.10		124.0		2.84		4.20		1.52		5.75		1.00			6.30			37.0			1.26			3.79			0.56			3.43		0.51
	D0283YQ6	3.07		0.22		5.51		16.50		1.74		2.86		273.0		14.70		135.0		3.06		4.38		1.63		6.14		1.02			6.57			36.6			1.24			3.77			0.55			3.38		0.49
	L0001-YQ2	20.5		1.55		43.0		61.20		8.23		10.60		29.0		44.60		310.0		8.01		9.44		2.32		9.02		1.30			7.36			42.1			1.39			4.35			0.65			4.28		0.64
	D0280YQ5	2.52		0.18		4.73		12.60		2.49		2.22		252.0		11.30		114.0		2.56		3.60		1.40		4.67		0.79			4.93			29.3			0.97			2.90			0.41			2.63		0.39
	D0280YQ6	3.36		0.19		5.72		15.40		4.14		2.70		13.9		13.60		138.0		3.09		4.34		1.43		5.72		0.97			6.18			39.5			1.32			3.87			0.57			3.73		0.53
钠长绿泥片岩	PM003-16YQ1	0.80		0.05		3.03		7.38		0.78		0.87		56.5		4.06		35.7		0.90		0.96		0.37		1.36		0.22			1.41			9.5			0.33			0.96			0.15			0.97		0.16
	L0001-YQ1	13.80		1.03		57.20		104.00		8.31		13.40		21.5		48.2		211.0		5.41		9.25		2.00		6.84		0.93			5.10			28.0			0.93			3.05			0.45			2.77		0.40
	D0210YQ1	45.00		2.54		249.00		149.00		14.60		65.70		83.2		267.0		205.0		6.12		52.5		9.30		51.90		7.06			38.50			246.0			7.17			19.3			2.39			12.9		1.67
	D0210YQ2	22.70		1.48		28.50		69.20		16.60		6.78		123.0		26.5		210.0		5.74		6.01		1.07		5.49		0.94			6.13			36.2			1.22			3.85			0.58			3.72		0.57
	D0280YQ1	15.00		1.01		41.90		61.30		2.86		10.80		11.6		43.8		245.0		5.88		9.74		2.30		8.39		1.28			6.91			29.2			1.19			3.31			0.47			2.94		0.43
	D0280YQ2	16.30		1.15		43.40		74.30		3.61		9.93		7.9		37.3		276.0		7.03		7.54		1.70		6.19		0.97			5.51			28.9			1.07			3.30			0.49			3.36		0.52

表2 西定地区澜沧岩群变火山岩的主量(%)和微量元素(10-6)测试数据

Table 2 Major elements (%) and trace elements (10-6) abundances for the metavolcanic rocks of the Lancang Group in Xiding area

岩性	样品编号	SiO₂	TiO₂		Al₂O₃		Fe₂ $O 3 T$		MnO		MgO		CaO		Na₂O		K₂O		P₂O₅		LOI		Mg^#		Sc		V		Cr			Co			Ni			Rb			Ba			Th			U
绿泥片岩	PM003-16YQ2	50.4	0.75		14.60		16.4		0.59		14.10		2.92		0.02		0.08		0.06		8.71		64.7		27.4		94		616			69.0			311			1.89			33.6			0.15			0.04
	PM003-17YQ1	47.9	0.91		17.4		11.2		0.24		9.47		10.00		2.72		0.12		0.07		6.26		64.9		40.1		211		316			51.7			161			3.61			76.0			0.26			0.06
	PM003-17YQ2	47.9	0.87		17.3		11.1		0.25		9.68		9.93		2.65		0.16		0.07		6.54		65.4		38.1		203		295			50.8			159			4.99			94.1			0.26			0.06
	PM003-18YQ1	49.5	1.14		16.2		11.7		0.35		8.25		9.47		0.16		3.01		0.11		14.60		58.2		35.3		213		225			39.5			111			76.10			1012			0.37			0.09
	PM003-18YQ2	48.4	1.14		17.1		12.6		0.31		7.90		9.09		0.20		3.16		0.11		14.60		55.3		38.6		223		239			50.9			119			79.00			1045			0.39			0.08
	D0270YQ1	47.4	1.45		18.3		14.0		0.34		9.43		4.44		3.30		1.28		0.12		7.41		59.2		53.1		311		293			68.3			154			26.70			292			0.43			0.14
	D0270YQ2	45.1	1.59		19.0		16.5		0.37		10.90		2.37		2.43		1.55		0.16		6.78		58.8		60.0		332		309			68.6			147			33.80			364			0.86			0.16
	D0270YQ3	49.5	1.42		18.5		9.7		0.26		7.76		7.50		5.29		0.04		0.09		7.40		63.2		51.0		275		301			49.6			138			0.97			14.3			0.66			0.13
	D0270YQ4	49.5	1.37		17.8		11.1		0.23		8.12		7.51		4.00		0.34		0.09		7.10		61.2		49.0		275		293			50.3			143			21.70			721			0.62			0.14
	D0270YQ5	51.0	1.37		17.9		11.2		0.23		7.12		7.70		3.28		0.10		0.09		6.29		58.2		47.8		259		296			49.3			143			5.91			23.0			0.62			0.15
	D0270YQ6	51.2	1.39		17.9		11.1		0.20		10.40		3.18		4.40		0.16		0.09		6.91		66.9		49.1		262		294			47.0			142			9.30			224			0.62			0.15
	D0282YQ1	47.3	1.34		17.2		12.5		0.20		10.50		7.87		2.92		0.03		0.11		4.26		65.3		46.6		284		255			51.8			132			0.76			57.1			0.70			0.17
	D0282YQ2	45.1	1.42		18.3		12.8		0.21		10.70		8.79		2.57		0.04		0.11		4.48		65.0		48.9		319		286			49.6			157			0.95			62.6			0.74			0.17
	D0283YQ1	46.7	1.75		14.8		14.7		0.21		9.66		9.76		2.14		0.11		0.17		3.26		59.6		54.9		332		282			35.6			59.0			2.06			658			0.57			0.12
	D0283YQ2	48.0	1.81		14.8		14.1		0.22		9.60		8.34		2.89		0.11		0.17		3.47		60.6		55.5		339		284			42.5			63.5			1.93			488			0.56			0.12
	D0283YQ3	48.5	1.68		14.7		13.7		0.21		9.36		8.53		3.03		0.11		0.18		3.35		60.8		53.5		320		307			38.8			64.4			1.95			513			0.61			0.13
	D0283YQ4	48.5	1.38		16.0		12.1		0.21		8.92		10.10		2.42		0.14		0.19		3.36		62.4		43.6		244		231			32.8			95.6			2.85			516			0.65			0.13
	D0283YQ5	49.3	1.84		13.7		14.4		0.21		8.68		9.29		2.40		0.07		0.17		3.22		57.7		52.3		335		209			32.4			48.3			1.16			314			0.53			0.12
	D0283YQ6	46.3	1.93		14.9		15.3		0.23		9.92		8.73		2.49		0.07		0.17		3.73		59.3		58.7		376		243			44.0			57.9			1.28			478			0.59			0.13
	L0001-YQ2	47.3	1.65		29.8		8.5		0.04		2.19		0.37		0.30		9.31		0.49		5.49		36.2		20.9		238		54			18.7			43.1			359.00			2361			27.60			5.07
	D0280YQ5	45.4	1.70		16.9		14.5		0.21		10.30		8.31		2.51		0.06		0.15		4.56		61.3		52.9		335		287			39.6			101.0			1.18			266			0.51			0.12
	D0280YQ6	50.1	2.03		19.1		15.0		0.15		11.30		0.22		1.58		0.30		0.21		6.45		62.1		54.4		327		268			56.4			140.0			10.8			80.1			0.71			0.23
钠长绿泥片岩	PM003-16YQ1	61.7	0.51		9.6		15.8		0.41		9.02		2.75		0.02		0.01		0.16		6.48		55.4		21.8		100			354			56.2			201			0.55			13			0.2		0.04
	L0001-YQ1	61.6	1.14		19.7		9.3		0.10		2.13		0.13		0.16		5.52		0.19		4.05		33.8		16.6		167			49			22.0			69.0			215			1763			17.4		3.54
	D0210YQ1	59.8	0.73		19.1		9.9		0.09		2.25		1.45		3.10		3.28		0.26		3.76		33.6		26.0		113			476			15.1			148.0			151			1637			26.6		4.00
	D0210YQ2	66.0	0.64		15.7		6.6		0.13		2.74		1.42		3.56		3.09		0.19		2.86		48.4		14.8		61			202			15.9			65.7			115			1110			21.5		3.44
	D0280YQ1	60.4	0.90		19.2		7.6		0.07		5.08		0.04		0.07		6.56		0.09		4.42		59.7		20.3		138			325			21.7			88.6			242			1399			13.8		2.70
	D0280YQ2	58.0	0.90		19.8		8.6		0.09		6.00		0.11		0.65		5.69		0.18		4.84		60.7		20.5		133			303			19.1			73.5			214			1186			18.2		3.28
岩性	样品编号	Nb		Ta		La		Ce		Pb		Pr		Sr		Nd		Zr		Hf		Sm		Eu		Gd		Tb			Dy			Y			Ho			Er			Tm			Yb		Lu
绿泥片岩	PM003-16YQ2	1.32		0.08		1.18		2.99		0.77		0.40		50.9		1.79		47.6		1.15		0.61		0.27		0.78		0.14			1.00			5.9			0.22			0.65			0.10			0.76		0.13
	PM003-17YQ1	1.25		0.08		2.24		6.50		14.80		1.11		284.0		6.07		45.9		1.26		1.89		0.76		2.49		0.44			2.84			15.8			0.59			1.74			0.25			1.65		0.25
	PM003-17YQ2	1.23		0.08		2.19		6.38		13.00		1.08		274.0		5.66		44.5		1.16		1.84		0.79		2.35		0.42			2.69			15.3			0.56			1.74			0.24			1.61		0.23
	PM003-18YQ1	1.61		0.10		3.25		9.31		2.88		1.62		82.0		8.09		61.5		1.49		2.43		0.95		3.21		0.53			3.30			17.6			0.66			1.88			0.27			1.71		0.26
	PM003-18YQ2	1.88		0.13		3.34		9.53		2.61		1.62		75.2		8.45		63.7		1.53		2.64		0.99		3.43		0.62			4.06			23.2			0.86			2.50			0.36			2.28		0.33
	D0270YQ1	1.67		0.10		2.90		9.16		1.57		1.59		51.2		8.10		79.9		2.12		2.53		0.99		3.44		0.59			3.68			20.4			0.73			2.28			0.33			2.18		0.31
	D0270YQ2	2.07		0.14		3.23		9.99		1.94		1.68		32.1		8.50		94.5		2.32		2.71		0.96		3.50		0.61			4.00			22.1			0.83			2.58			0.38			2.74		0.42
	D0270YQ3	1.65		0.11		3.77		11.50		1.76		1.95		96.8		10.40		78.6		2.05		3.23		1.16		4.05		0.67			4.48			23.0			0.89			2.52			0.37			2.37		0.35
	D0270YQ4	1.62		0.11		2.77		8.98		4.71		1.71		223.0		8.72		78.0		2.03		2.98		1.22		3.97		0.66			4.56			24.7			0.95			2.84			0.43			2.79		0.43
	D0270YQ5	1.61		0.11		2.63		8.38		4.99		1.58		224.0		8.57		77.9		2.04		2.87		1.09		3.70		0.73			4.52			27.0			0.91			2.83			0.42			2.67		0.40
	D0270YQ6	1.69		0.12		1.61		5.31		3.33		0.93		39.3		5.07		81.0		2.13		1.74		0.78		2.75		0.50			3.57			19.6			0.75			2.33			0.35			2.33		0.34
	D0282YQ1	2.23		0.14		4.43		12.40		43.10		2.14		249.0		10.70		90.3		2.07		3.22		1.30		4.33		0.74			4.65			28.0			0.95			2.91			0.41			2.63		0.38
	D0282YQ2	2.17		0.15		4.19		12.00		7.94		2.05		291.0		10.70		94.4		2.13		3.21		1.28		4.51		0.77			4.95			30.0			1.00			3.02			0.44			2.75		0.41
	D0283YQ1	2.91		0.19		5.00		15.20		1.74		2.61		336.0		13.50		126.0		2.93		4.32		1.55		5.65		0.99			6.01			35.2			1.17			3.54			0.51			3.20		0.48
	D0283YQ2	3.10		0.20		5.01		15.20		2.44		2.68		238.0		14.00		129.0		3.04		4.31		1.54		5.79		0.99			6.19			36.2			1.30			3.75			0.55			3.51		0.51
	D0283YQ3	3.05		0.20		4.96		15.20		1.95		2.75		236.0		13.60		134.0		3.00		4.17		1.48		5.81		0.93			6.05			35.7			1.23			3.68			0.54			3.41		0.52
	D0283YQ4	3.14		0.22		5.48		16.70		2.35		2.84		319.0		14.70		136.0		3.09		4.44		1.58		5.95		1.04			6.36			37.2			1.25			3.77			0.55			3.42		0.52
	D0283YQ5	3.11		0.23		5.01		14.90		2.05		2.73		261.0		14.10		124.0		2.84		4.20		1.52		5.75		1.00			6.30			37.0			1.26			3.79			0.56			3.43		0.51
	D0283YQ6	3.07		0.22		5.51		16.50		1.74		2.86		273.0		14.70		135.0		3.06		4.38		1.63		6.14		1.02			6.57			36.6			1.24			3.77			0.55			3.38		0.49
	L0001-YQ2	20.5		1.55		43.0		61.20		8.23		10.60		29.0		44.60		310.0		8.01		9.44		2.32		9.02		1.30			7.36			42.1			1.39			4.35			0.65			4.28		0.64
	D0280YQ5	2.52		0.18		4.73		12.60		2.49		2.22		252.0		11.30		114.0		2.56		3.60		1.40		4.67		0.79			4.93			29.3			0.97			2.90			0.41			2.63		0.39
	D0280YQ6	3.36		0.19		5.72		15.40		4.14		2.70		13.9		13.60		138.0		3.09		4.34		1.43		5.72		0.97			6.18			39.5			1.32			3.87			0.57			3.73		0.53
钠长绿泥片岩	PM003-16YQ1	0.80		0.05		3.03		7.38		0.78		0.87		56.5		4.06		35.7		0.90		0.96		0.37		1.36		0.22			1.41			9.5			0.33			0.96			0.15			0.97		0.16
	L0001-YQ1	13.80		1.03		57.20		104.00		8.31		13.40		21.5		48.2		211.0		5.41		9.25		2.00		6.84		0.93			5.10			28.0			0.93			3.05			0.45			2.77		0.40
	D0210YQ1	45.00		2.54		249.00		149.00		14.60		65.70		83.2		267.0		205.0		6.12		52.5		9.30		51.90		7.06			38.50			246.0			7.17			19.3			2.39			12.9		1.67
	D0210YQ2	22.70		1.48		28.50		69.20		16.60		6.78		123.0		26.5		210.0		5.74		6.01		1.07		5.49		0.94			6.13			36.2			1.22			3.85			0.58			3.72		0.57
	D0280YQ1	15.00		1.01		41.90		61.30		2.86		10.80		11.6		43.8		245.0		5.88		9.74		2.30		8.39		1.28			6.91			29.2			1.19			3.31			0.47			2.94		0.43
	D0280YQ2	16.30		1.15		43.40		74.30		3.61		9.93		7.9		37.3		276.0		7.03		7.54		1.70		6.19		0.97			5.51			28.9			1.07			3.30			0.49			3.36		0.52

图5 西定地区澜沧岩群变火山岩的主量元素哈克图解(图(g)底图据文献[40], 数据来自文献[12,18⇓-20])

Fig.5 Harker diagrams of major elements for the metavolcanic rocks of the Lancang Group in Xiding area((g) basemap according to reference[40],data from references [12,18⇓-20])

图6 西定地区澜沧岩群变火山岩TAS分类图(a)(底图据文献[41])、Nb/Y-Zr/TiO2×10-4分类图(b)(底图据文献[42])及SiO2-FeOt/MgO图(c)(底图据文献[43])

Fig.6 (Na2O+K2O)-SiO2 diagram(a), Nb/Y-Zr/TiO2×10-4 diagram(b) and SiO2-FeOt/MgO diagram(c) for metavolcanic rocks of the Lancang Group in Xiding area(basemaps after refs.[41],[42]and[43],respectively)

图7 西定地区澜沧岩群变火山岩的球粒陨石标准化稀土配分图(a)及原始地幔标准化蛛网图(b)(球粒陨石、原始地幔和N-MORB数据来自文献[44])

Fig.7 Chondrite-normalized REE(a) and primitive mantle-normalized incompatible element patterns for metavolcanic rocks of the Lancang Group in Xiding area (b)

图8 西定地区澜沧岩群变火山岩的Hf/3-Th-Nb/16图解(a)(底图据文献[49])、Ta/Yb-Th/Yb图解(b)(底图据文献[50])及Ba/La-Th/Yb 图解(c)(底图据文献[52])

Fig.8 Hf/3-Th-Nb/16 diagram(a), Ta/Yb vs Th/Yb diagram (b), and Ba/La vs Th/Yb diagram (c) for metavolcanic rocks of the Lancang Group in Xiding area

图9 西南三江南段主要地块早古生代岩浆岩的年龄分布 (数据来源:保山地块西缘据尹福光等[53]、Dong等[54]、Wang等[55]、Li等[56]、Chen等[57],保山地块东缘据尹福光等[53]、Wang等[58],昌宁—孟连带据Wang等[24]、王冬兵等[25],临沧地体侵入岩据孙载波[27]、彭智敏等[28]、韩文文等[46],火山岩据Wei等[12]、Nie等[19]、Xing等[20],思茅地块据毛晓长等[22]、Lehmann等[23]、Wang等[52])

Fig.9 Age distribution of Early Paleozoic magmatic rocks in the main blocks of the Sanjiang region

图10 东冈瓦纳北缘早古生代主要陆块古地理位置(修改自文献[8,13];临沧地体置于思茅地块的边缘,并未作为独立地块,而是原特提斯洋南支俯冲在思茅(印支)地块边缘形成的陆缘弧)

Fig.10 Cambrian-Ordovician reconstruction of the Proto-Tethys and continental blocks along the northern margin of Eastern Gondwana (modified after references [8,13])

参考文献 61

[23]	LEHMANN B, ZHAO X F, ZHOU M F, et al. Mid-Silurian back-arc spreading at the northeastern margin of Gondwana: The Dapingzhang dacite-hosted massive sulfide deposit, Lancangjiang zone, southwestern Yunnan, China[J]. Gondwana Research, 2013, 24(2): 648-663.
[24]	WANG B D, WANG L Q, PAN G T, et al. U-Pb zircon dating of Early Paleozoic gabbro from the Nantinghe ophiolite in the Changning-Menglian suture zone and its geological implication[J]. Chinese Science Bulletin, 2013, 58(8): 920-930.
[25]	王冬兵, 罗亮, 唐渊, 等. 昌宁—孟连结合带牛井山早古生代埃达克岩锆石U-Pb年龄、岩石成因及其地质意义[J]. 岩石学报, 2016, 32(8): 2317-2329.
[26]	吴喆, 王保弟, 王冬兵, 等. 昌宁—孟连缝合带南汀河早古生代埃达克岩锆石U-Pb年龄及其地质意义[J]. 地球科学, 2020, 45(8): 3003-3013.
[27]	孙载波, 胡绍斌, 周坤, 等. 滇西南勐海布朗山奥陶纪花岗岩锆石U-Pb年龄、Hf同位素组成特征及其构造意义[J]. 地质通报, 2018, 37(11): 2044-2054.
[28]	彭智敏, 张辑, 关俊雷, 等. 滇西“三江” 地区临沧花岗岩基早—中奥陶世花岗质片麻岩的发现及其意义[J]. 地球科学, 2018, 43(8): 2571-2585.
[29]	胡英. 1:20万勐海幅区域地质调查报告[R]. 昆明: 云南省地质局区调队, 1979.
[30]	雷作淇. 云南澜沧群微古植物群的发现及其意义[J]. 地层学杂志, 1982, 6(4): 281-285.
[31]	俞赛赢, 李序贵, 刘桂春, 等. 1:25万景洪市幅、勐腊县幅、澜沧县幅、勐海县幅区调修测报告[R]. 昆明: 云南省地质调查院, 2013.
[32]	孙载波, 吴嘉林, 周坤云, 等. 1:5 万香竹林(F47E001015)、勐勇(F47E001016)、勐撒(F47E002015)、懂过(F47E002016)、耿马(F47E003014)、安雅(F47E003015)、勐库(F47E003016)七幅区域地质矿产调查报告[R]. 昆明: 云南省地质调查局, 2017.
[33]	张志斌, 等. 1:25万临沧县幅、滚龙幅区域地质调查报告[R]. 昆明: 云南省地质调查院区域地质调查所, 2003.
[1]	METCALFE I. Gondwana dispersion and Asian accretion: Tectonic and palaeogeographic evolution of eastern Tethys[J]. Journal of Asian Earth Sciences, 2013, 66: 1-33.
[2]	王立全, 王保弟, 李光明, 等. 东特提斯地质调查研究进展综述[J]. 沉积与特提斯地质, 2021, 41(2): 283-296.
[3]	潘桂棠, 王立全, 耿全如, 等. 班公湖—双湖—怒江—昌宁—孟连对接带时空结构: 特提斯大洋地质及演化问题[J]. 沉积与特提斯地质, 2020, 40(3): 1-19.
[4]	DENG J, WANG Q F, LI G J, et al. Tethys tectonic evolution and its bearing on the distribution of important mineral deposits in the Sanjiang Region, SW China[J]. Gondwana Research, 2014, 26(2): 419-437.
[5]	钟大赉. 滇川西部古特提斯造山带[M]. 北京: 科学出版社, 1998: 1-231.
[6]	吴福元, 万博, 赵亮, 等. 特提斯地球动力学[J]. 岩石学报, 2020, 36(6): 1627-1674.
[7]	云南省地矿局. 云南省区域地质志[M]. 北京: 地质出版社, 1990: 1-658
[8]	METCALFE I. Multiple Tethyan Ocean Basins and orogenic belts in Asia[J]. Gondwana Research, 2021, 100: 87-130.
[9]	王义昭, 李兴林, 段丽兰, 等. 三江地区南段大地构造与成矿[M]. 北京: 地质出版社, 2000: 1-123.
[10]	方宗杰, 周志澄, 林敏基. 关于滇西地质的若干新认识[J]. 科学通报, 1990, 35(5): 363-365.
[11]	LIU B B, PENG T P, FAN W M, et al. Tectonic evolution and paleoposition of the Baoshan and Lincang blocks of West Yunnan during the Paleozoic[J]. Tectonics, 2020, 39(10):e2019TC006028.
[34]	赵靖, 钟大赉, 王毅. 滇西澜沧变质带变质作用和变形作用的关系[J]. 岩石学报, 1994, 10(1): 27-40.
[35]	孙载波, 李静, 周坤, 等. 滇西双江县勐库地区退变质榴辉岩的岩石地球化学特征及其地质意义[J]. 现代地质, 2017, 31(4): 746-756.
[36]	翟明国, 从柏林, 乔广生, 等. 中国滇西南造山带变质岩的Sm-Nd和Rb-Sr同位素年代学[J]. 岩石学报, 1990, 6(4): 1-11.
[37]	LIU Y S, GAO S, HU Z C, et al. Continental and oceanic crust recycling-induced melt-peridotite interactions in the trans-north China Orogen: U-Pb dating, Hf isotopes and trace elements in zircons from mantle xenoliths[J]. Journal of Petrology, 2010, 51(1/2): 537-571.
[38]	VERMEESCH P. IsoplotR: A free and open toolbox for geochronology[J]. Geoscience Frontiers, 2018, 9(5): 1479-1493.
[39]	LIU Y S, ZONG K Q, KELEMEN P B, et al. Geochemistry and magmatic history of eclogites and ultramafic rocks from the Chinese continental scientific drill hole: Subduction and ultrahigh-pressure metamorphism of lower crustal cumulates[J]. Chemical Geology, 2008, 247(1/2): 133-153.
[40]	PECCERILLO A, TAYLOR S R. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu Area, Northern Turkey[J]. Contributions to Mineralogy and Petrology, 1976, 58(1): 63-81.
[41]	MAITRE R W L, STRECKEISEN A, ZANETTIN B, et al. Igneous Rocks: A Classification and Glossary of Terms[M]. Cambridge: Cambridge University Press, 2002.
[42]	WINCHESTER J A, FLOYD P A. Geochemical discrimination of different magma series and their differentiation products using immobile elements[J]. Chemical Geology, 1977, 20: 325-343.
[43]	MIYASHIRO A. Volcanic rock series in island arcs and active continental margins[J]. American Journal of Science, 1974, 274(4): 321-355.
[44]	SUN S S, MCDONOUGH W F. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes[J]. Geological Society, London, Special Publications, 1989, 42(1): 313-345.
[12]	WEI Y H, ZI J W, LIU G C, et al. Reconstructing the Lancang Terrane (SW Yunnan) and implications for Early Paleozoic Proto-Tethys evolution at the northern margin of Gondwana[J]. Gondwana Research, 2022, 101: 278-294.
[13]	ZHAO T Y, FENG Q L, METCALFE I, et al. Detrital zircon U-Pb-Hf isotopes and provenance of Late Neoproterozoic and Early Paleozoic sediments of the Simao and Baoshan blocks, SW China: Implications for Proto-Tethys and Paleo-Tethys evolution and Gondwana reconstruction[J]. Gondwana Research, 2017, 51: 193-208.
[14]	冯庆来, 刘本培, 叶玫, 等. 滇西南南段组和拉巴群地质时代及构造背景[J]. 地层学杂志, 1996, 20(3): 183-189.
[15]	刘本培, 冯庆来, 方念乔, 等. 滇西南昌宁—孟连带和澜沧江带古特提斯多岛洋构造演化[J]. 地球科学, 1993, 18(5): 529-539.
[16]	张远志, 云南省地质矿产局. 云南省岩石地层[M]. 武汉: 中国地质大学出版社, 1996.
[17]	王保弟, 王立全, 王冬兵, 等. 三江昌宁—孟连带原—古特提斯构造演化[J]. 地球科学, 2018, 43(8): 2527-2550.
[18]	沈上越, 冯庆来, 魏启荣, 等. 南澜沧江带南段原特提斯岛弧火山岩新证据[J]. 矿物岩石, 2008, 28(4): 59-63.
[19]	NIE X M, FENG Q L, QIAN X, et al. Magmatic record of Prototethyan evolution in SW Yunnan, China: Geochemical, zircon U-Pb geochronological and Lu-Hf isotopic evidence from the Huimin metavolcanic rocks in the southern Lancangjiang zone[J]. Gondwana Research, 2015, 28(2): 757-768.
[20]	XING X W, WANG Y J, CAWOOD P A, et al. Early Paleozoic accretionary orogenesis along northern margin of Gondwana constrained by high-Mg metaigneous rocks, SW Yunnan[J]. International Journal of Earth Sciences, 2017, 106(5): 1469-1486.
[21]	张菁菁, 李大鹏, 康欢, 等. 滇西澜沧江构造带中段中生代岩浆岩的年代学、地球化学特征及其地质意义[J]. 现代地质, 2021, 35(6): 1733-1751.
[22]	毛晓长, 王立全, 李冰, 等. 云县—景谷火山弧带大中河晚志留世火山岩的发现及其地质意义[J]. 岩石学报, 2012, 28(5): 1517-1528.
[45]	彭智敏, 付于真, 胡金锋, 等. 云南省双江县大芒光房幅(F47E004015)、双江县幅(F47E004016)、文东幅(F47E005016)三幅区域地质调查报告[R]. 成都: 成都地质调查中心, 2019.
[46]	韩文文, 彭智敏, 张辑, 等. 滇西澜沧岩群钠长浅粒岩锆石U-Pb测年、Hf同位素组成及构造意义[J]. 地质学报, 2020, 94(4): 1282-1294.
[47]	WANG H N, LIU F L, SANTOSH M, et al. Subduction erosion associated with Paleo-Tethys closure: Deep subduction of sediments and high pressure metamorphism in the SE Tibetan Plateau[J]. Gondwana Research, 2020, 82: 171-192.
[48]	HAWKESWORTH C, TURNER S, PEATE D, et al. Elemental U and Th variations in island arc rocks: Implications for U-series isotopes[J]. Chemical Geology, 1997, 139(1/4): 207-221.
[49]	WOOD D A. The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary Volcanic Province[J]. Earth and Planetary Science Letters, 1980, 50(1): 11-30.
[50]	PEARCE J A. Supra-subduction zone ophiolites: The search for modern analogues[M]// Ophiolite Concept and the Evolution of Geological Thought. Washington: Geological Society of America, 2003:269-293.
[51]	WOODHEAD J D, HERGT J M, DAVIDSON J P, et al. Hafnium isotope evidence for ‘conservative’ element mobility during subduction zone processes[J]. Earth and Planetary Science Letters, 2001, 192(3): 331-346.
[52]	WANG X Y, LÜ Q T, CAO D H, et al. Geochronology, geochemistry and zircon Hf-O isotopic composition of ore-bearing volcanic rocks at Dapingzhang VMS Cu-Zn deposit, SW China: Petrogenetic, metallogenic and tectonic implications[J]. Ore Geology Reviews, 2021, 133: 104040.
[53]	尹福光, 徐波, 王冬兵, 等. 西南三江造山带早古生代岩浆事件及其对原特提斯大洋演化的响应[J]. 地质通报, 2021, 40(6): 817-826.
[54]	DONG M L, DONG G C, MO X X, et al. Geochemistry, zircon U-Pb geochronology and Hf isotopes of granites in the Baoshan Block, Western Yunnan: Implications for Early Paleozoic evolution along the Gondwana margin[J]. Lithos, 2013, 179: 36-47.
[55]	WANG C M, DENG J, LU Y J, et al. Age, nature, and origin of Ordovician Zhibenshan granite from the Baoshan terrane in the Sanjiang Region and its significance for understanding Proto-Tethys evolution[J]. International Geology Review, 2015, 57(15): 1922-1939.
[56]	LI G J, WANG Q F, HUANG Y H, et al. Petrogenesis of Middle Ordovician peraluminous granites in the Baoshan Block: Implications for the Early Paleozoic tectonic evolution along East Gondwana[J]. Lithos, 2016, 245: 76-92.
[57]	CHEN F K, LI X H, WANG X L, et al. Zircon age and Nd-Hf isotopic composition of the Yunnan Tethyan belt, southwestern China[J]. International Journal of Earth Sciences, 2007, 96(6): 1179-1194.
[58]	WANG Y J, QIAN X, CAWOOD P A, et al. Prototethyan accretionary orogenesis along the East Gondwana periphery: New insights from the Early Paleozoic igneous and sedimentary rocks in the sibumasu[J]. Geochemistry, Geophysics, Geosystems, 2021, 22(5): e2020GC009622.
[59]	LIU S, HU R Z, GAO S, et al. U-Pb zircon, geochemical and Sr-Nd-Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong-Baoshan Block, Western Yunnan Province, SW China[J]. Journal of Asian Earth Sciences, 2009, 36(2/3): 168-182.
[60]	康欢, 李大鹏, 陈岳龙, 等. 云南保山东缘早古生代高Si花岗岩的成因及构造意义[J]. 现代地质, 2016, 30(5): 1026-1037.
[61]	王岳军, 卢向红, 钱鑫, 等. 滇西—东南亚原特提斯南支的造山作用[J]. 中国科学(地球科学), 2022, 52(11): 2077-2104.