阿拉善北大山地区花岗斑岩岩石成因及构造启示:元素地球化学、锆石U-Pb年代学及Hf同位素约束

doi:10.19657/j.geoscience.1000-8527.2023.063

现代地质 ›› 2023, Vol. 37 ›› Issue (06): 1580-1596.DOI: 10.19657/j.geoscience.1000-8527.2023.063

• 岩石学与岩石地球化学 • 上一篇下一篇

阿拉善北大山地区花岗斑岩岩石成因及构造启示:元素地球化学、锆石U-Pb年代学及Hf同位素约束

苏惠¹^,²(), 曾认宇¹^,²^,³^,⁴(), 甘德斌¹^,², 严杰¹^,²

1.东华理工大学地球科学学院,江西南昌 330013
2.东华理工大学核资源与环境国家重点实验室,江西南昌 330013
3.中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙 410083
4.杜伦大学地球科学学部,英国杜伦 DH13LE

收稿日期:2022-12-13 修回日期:2023-06-15 出版日期:2023-12-10 发布日期:2024-01-24
通讯作者: 曾认宇,男,博士,副教授,1989年出生,地质学专业,主要从事岩浆岩及其相关矿床的研究。Email:zengrenyu@126.com。
作者简介:苏惠,女,硕士研究生,1998年出生,地质学专业,主要从事岩浆岩及其相关矿床的研究。Email:sh920601@163.com。
基金资助:
国家自然科学基金项目(41902075);国家自然科学基金项目(42030809);国家自然科学基金项目(42002095);国家自然科学基金项目(42162013);国家自然科学基金项目(42262017);核资源与环境国家重点实验室开放基金项目(2020NRE13);有色金属成矿预测与地质环境监测教育部重点实验室(中南大学)开放基金资助项目(2022YSJS10);国家留学基金委访问学者项目(202008360018);江西省自然科学基金项目(20232BAB213061)

Petrogenesis and Tectonic Implications of Granite Porphyry in the Beidashan Area,Alxa Block: Constraints from Geochemistry, Zircon U-Pb Geochronology and Hf Isotopes

SU Hui¹^,²(), ZENG Renyu¹^,²^,³^,⁴(), GAN Debin¹^,², YAN Jie¹^,²

1. College of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China
2. East China University of Technology,State Key Laboratory of Nuclear Resources and Environment,Nanchang,Jiangxi 330013,China
3. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Hunan,Changsha 410083, China
4. Department of Earth Science,Durham University, Durham DH13LE,UK

Received:2022-12-13 Revised:2023-06-15 Online:2023-12-10 Published:2024-01-24

摘要/Abstract

摘要：

阿拉善地块位于华北克拉通西南部,其早前寒武纪地质演化及板块归属一直存在争议。北大山杂岩作为阿拉善地块少有出露的前寒武纪变质基底,记录了前寒武纪岩浆-变质事件,为上述问题的制约提供了良好的研究窗口。本文对北大山地区次井子花岗斑岩开展系统的岩石学、地球化学、锆石年代学及Hf同位素数据研究。结果表明,岩石具有较高的SiO₂(73.85%~ 75.41%)、Al₂O₃(13.40%~ 14.19%)和K₂O(3.83%~ 4.80%)值,较低的Na₂O(2.10%~ 3.31%)和$\mathrm{Fe}_{2} \mathrm{O}_{3}{ }^{\mathrm{T}}$(0.93%~ 1.33%)值。岩石相对富集轻稀土元素而亏损重稀土元素,具有明显的负铕异常(δEu=0.15~ 0.29),亏损Nb、Ta和Ti等高场强元素,显示高分异I型花岗岩特征。岩浆锆石U-Pb年龄揭示岩体形成于(2035.6±8.4) Ma,锆石ε_Hf(t)值(0.48~ 7.04)均为正值且变化范围较大,Hf同位素地壳模式年龄$T_{\mathrm{DM}}{ }^{\mathrm{C}}$介于2627 Ma和2222 Ma之间,显示岩浆具有壳幔混合的成因特征。综合分析认为,阿拉善地块约2.0 Ga的岩浆事件存在双峰式火山岩组合的特征,且其中的酸性岩多为A型花岗岩,指示伸展的构造背景。锆石年龄和Hf同位素组成的系统对比分析表明,西阿拉善地块与华北克拉通孔兹岩带岩浆在古元古代存在明显的亲缘关系。

关键词: 华北克拉通, 阿拉善地块, 北大山地区, 古元古代, 锆石, 岩浆事件

Abstract:

The Beidashan Complex is located in the Beidashan area of the Alxa block,and represents an Early Precambrian metamorphic basement.These magmatic-metamorphic events are of great significance for studying the tectonic evolution and tectonic affinity of the Early Precambrian Alxa block.Here,we studied the petrography,geochemistry,zircon geochronology and Hf isotopes of the Cijingzi granite porphyry in the Beidashan area.The geochemical data shows that Cijingzi granite porphyry is characterized by high SiO₂(73.85%-75.41%),Al₂O₃(13.40%-14.19%) and K₂O(3.83%-4.80%),and low Na₂O(2.10%-3.31%) and $\mathrm{Fe}_{2} \mathrm{O}_{3}{ }^{\mathrm{T}}$(0.93%-1.33%).The rocks have obvious negative Eu anomalies(δEu=0.15-0.29),with obvious enrichment of light rare earth elements(LREE)and depletion in heavy rare earth elements(HREE)in the chondrite-normalized REE patterns.It is also depleted in Nb, Ta,Ti and other high field strength elements(HFSEs)in the primitive mantle-normalized trace element patterns,similar to highly fractional I-type granite.LA-ICP-MS zircon U-Pb dating of the Cijingzi granite porphyry yielded an emplacement age of 2,035.6±8.4 Ma.The Cijingzi granite porphyry has ε_Hf(t)=0.48-7.04 and Hf model age=2,627-2,222 Ma,indicating that the characteristics of the mixing of crust-derived magmas with mantle-derived ones.Combined with the previous studies,the magmatic event at Ca.2.0 Ga in the Alxa block exhibits the bimodal volcanic assemblage,and the felsic rocks are mostly of A-type,which were formed in an extensional environment.Zircon ages and Hf isotope compositions shows that the Alxa block and the Khondalite belt of the North China Craton have clear affinity in the Paleoproterozoic.

Key words: North China Craton, Alxa block, Beidashan area, Paleoproterozoic, zircon, magmatic event

中图分类号:

苏惠, 曾认宇, 甘德斌, 严杰. 阿拉善北大山地区花岗斑岩岩石成因及构造启示:元素地球化学、锆石U-Pb年代学及Hf同位素约束[J]. 现代地质, 2023, 37(06): 1580-1596.

SU Hui, ZENG Renyu, GAN Debin, YAN Jie. Petrogenesis and Tectonic Implications of Granite Porphyry in the Beidashan Area,Alxa Block: Constraints from Geochemistry, Zircon U-Pb Geochronology and Hf Isotopes[J]. Geoscience, 2023, 37(06): 1580-1596.

图/表 14

图1 阿拉善地区大地构造位置(a)(底图据Zeng等[33])和地质简图(b)(底图据张建新[18])

Fig.1 Tectonic location (a)(basemap after Zeng et al[33]) and geological sketch (b)(basemap after Zhang et al[18]) of the Alxa region

图2 次井子花岗斑岩野外与显微照片 (a)(b)野外宏观产出照片;(c)(d)次井子花岗斑岩的镜下照片;Kfs.钾长石;Qz.石英

Fig.2 Field and microscopic photographs of granite porphyry from Cijingzi area

表1 次井子花岗斑岩锆石U-Pb年龄测试数据(样品LSS18-89)

Table 1 Zircon U-Pb dating of granite porphyry from Cijingzi area (sample No.LSS18-89)

测点号	元素含量(10^-6)			Th/U	同位素比值							同位素年龄(Ma)
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
1	299.67	109.89	680.78	0.16	0.1258	0.0011	6.4868	0.0623	0.3723	0.0023	2040.43		16.20		2044.11		8.56		2040.17		10.72
2	78.49	136.91	151.14	0.91	0.1273	0.0012	6.5907	0.0667	0.3744	0.0024	2061.11		16.36		2058.11		9.03		2050.0		11.35
3	327.15	130.61	728.52	0.18	0.1262	0.0010	6.6950	0.0663	0.3833	0.0028	2055.55		13.89		2071.96		8.86		2091.9		13.22
4	147.84	95.52	326.43	0.29	0.1250	0.0010	6.4874	0.0627	0.3750	0.0025	2028.09		14.51		2044.19		8.62		2052.9		11.94
6	94.00	57.61	206.54	0.28	0.1265	0.0011	6.7872	0.0752	0.3876	0.0031	2050.31		15.28		2084.06		9.91		2111.6		14.53
7	177.37	117.90	378.09	0.31	0.1254	0.0011	6.7002	0.0670	0.3859	0.0025	2035.18		14.66		2072.65		8.95		2103.6		11.84
8	146.65	99.87	319.47	0.31	0.1260	0.0013	6.5390	0.0725	0.3746	0.0023	2042.28		18.36		2051.17		9.87		2051.2		11.02
9	74.72	50.13	165.19	0.30	0.1262	0.0013	6.5619	0.0765	0.3757	0.0028	2045.98		18.21		2054.24		10.37		2056.4		13.19
11	174.03	115.32	382.02	0.30	0.1260	0.0011	6.5329	0.0656	0.3754	0.0030	2042.28		14.97		2050.35		8.95		2054.8		13.92
13	66.33	41.11	145.42	0.28	0.1247	0.0012	6.5320	0.0665	0.3789	0.0025	2024.38		16.67		2050.23		9.08		2071.2		11.94
14	62.32	30.97	141.20	0.22	0.1232	0.0016	6.5565	0.0710	0.3759	0.0025	2002.16		22.84		2053.52		9.64		2057.0		11.65
15	211.45	141.66	479.80	0.30	0.1269	0.0012	6.5904	0.0685	0.3754	0.0027	2055.24		16.67		2058.06		9.27		2054.7		12.49
16	294.04	209.98	646.87	0.32	0.1252	0.0012	6.5199	0.0678	0.3764	0.0026	2032.41		17.60		2048.59		9.27		2059.4		12.12
17	362.99	157.71	828.05	0.19	0.1249	0.0012	6.5061	0.0696	0.3762	0.0026	2027.47		22.68		2046.72		9.51		2058.6		12.17
18	471.68	495.60	1160.58	0.43	0.1231	0.0011	5.6928	0.0634	0.3340	0.0027	2001.54		16.36		1930.27		9.71		1857.6		12.93
19	117.94	63.00	265.42	0.24	0.1275	0.0012	6.5991	0.0647	0.3738	0.0023	2064.50		16.36		2059.23		8.76		2047.2		10.99
20	114.42	46.33	265.49	0.17	0.1245	0.0011	6.3731	0.0646	0.3700	0.0025	2021.30		16.67		2028.57		9.01		2029.4		11.99
22	85.87	54.92	174.77	0.31	0.1271	0.0012	7.1871	0.0757	0.4086	0.0028	2057.71		17.75		2134.91		9.50		2208.7		12.77
24	215.24	99.38	466.57	0.21	0.1263	0.0013	6.9077	0.0789	0.3948	0.0029	2046.60		18.05		2099.65		10.24		2145.2		13.55
27	216.39	206.27	477.61	0.43	0.1254	0.0011	6.3539	0.0601	0.3657	0.0023	2035.18		14.81		2025.93		8.41		2009.2		10.99
29	256.00	125.86	579.36	0.22	0.1238	0.0010	6.3994	0.0598	0.3730	0.0025	2012.96		13.73		2032.18		8.33		2043.7		11.69
30	151.56	89.23	347.40	0.26	0.1210	0.0015	6.5104	0.0631	0.3746	0.0025	1972.23		22.22		2047.30		8.65		2051.0		11.60
33	453.17	369.19	1012.11	0.36	0.1226	0.0011	6.2047	0.0632	0.3653	0.0024	1994.45		16.36		2005.11		9.01		2007.1		11.28
34	112.59	101.17	246.93	0.41	0.1238	0.0012	6.2628	0.0627	0.3653	0.0023	2012.96		16.67		2013.27		8.87		2007.4		10.84
35	187.55	138.33	385.55	0.36	0.1244	0.0011	6.9647	0.0735	0.4040	0.0029	2020.37		14.97		2106.93		9.48		2187.6		13.39

表1 次井子花岗斑岩锆石U-Pb年龄测试数据(样品LSS18-89)

Table 1 Zircon U-Pb dating of granite porphyry from Cijingzi area (sample No.LSS18-89)

测点号	元素含量(10^-6)			Th/U	同位素比值							同位素年龄(Ma)
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
1	299.67	109.89	680.78	0.16	0.1258	0.0011	6.4868	0.0623	0.3723	0.0023	2040.43		16.20		2044.11		8.56		2040.17		10.72
2	78.49	136.91	151.14	0.91	0.1273	0.0012	6.5907	0.0667	0.3744	0.0024	2061.11		16.36		2058.11		9.03		2050.0		11.35
3	327.15	130.61	728.52	0.18	0.1262	0.0010	6.6950	0.0663	0.3833	0.0028	2055.55		13.89		2071.96		8.86		2091.9		13.22
4	147.84	95.52	326.43	0.29	0.1250	0.0010	6.4874	0.0627	0.3750	0.0025	2028.09		14.51		2044.19		8.62		2052.9		11.94
6	94.00	57.61	206.54	0.28	0.1265	0.0011	6.7872	0.0752	0.3876	0.0031	2050.31		15.28		2084.06		9.91		2111.6		14.53
7	177.37	117.90	378.09	0.31	0.1254	0.0011	6.7002	0.0670	0.3859	0.0025	2035.18		14.66		2072.65		8.95		2103.6		11.84
8	146.65	99.87	319.47	0.31	0.1260	0.0013	6.5390	0.0725	0.3746	0.0023	2042.28		18.36		2051.17		9.87		2051.2		11.02
9	74.72	50.13	165.19	0.30	0.1262	0.0013	6.5619	0.0765	0.3757	0.0028	2045.98		18.21		2054.24		10.37		2056.4		13.19
11	174.03	115.32	382.02	0.30	0.1260	0.0011	6.5329	0.0656	0.3754	0.0030	2042.28		14.97		2050.35		8.95		2054.8		13.92
13	66.33	41.11	145.42	0.28	0.1247	0.0012	6.5320	0.0665	0.3789	0.0025	2024.38		16.67		2050.23		9.08		2071.2		11.94
14	62.32	30.97	141.20	0.22	0.1232	0.0016	6.5565	0.0710	0.3759	0.0025	2002.16		22.84		2053.52		9.64		2057.0		11.65
15	211.45	141.66	479.80	0.30	0.1269	0.0012	6.5904	0.0685	0.3754	0.0027	2055.24		16.67		2058.06		9.27		2054.7		12.49
16	294.04	209.98	646.87	0.32	0.1252	0.0012	6.5199	0.0678	0.3764	0.0026	2032.41		17.60		2048.59		9.27		2059.4		12.12
17	362.99	157.71	828.05	0.19	0.1249	0.0012	6.5061	0.0696	0.3762	0.0026	2027.47		22.68		2046.72		9.51		2058.6		12.17
18	471.68	495.60	1160.58	0.43	0.1231	0.0011	5.6928	0.0634	0.3340	0.0027	2001.54		16.36		1930.27		9.71		1857.6		12.93
19	117.94	63.00	265.42	0.24	0.1275	0.0012	6.5991	0.0647	0.3738	0.0023	2064.50		16.36		2059.23		8.76		2047.2		10.99
20	114.42	46.33	265.49	0.17	0.1245	0.0011	6.3731	0.0646	0.3700	0.0025	2021.30		16.67		2028.57		9.01		2029.4		11.99
22	85.87	54.92	174.77	0.31	0.1271	0.0012	7.1871	0.0757	0.4086	0.0028	2057.71		17.75		2134.91		9.50		2208.7		12.77
24	215.24	99.38	466.57	0.21	0.1263	0.0013	6.9077	0.0789	0.3948	0.0029	2046.60		18.05		2099.65		10.24		2145.2		13.55
27	216.39	206.27	477.61	0.43	0.1254	0.0011	6.3539	0.0601	0.3657	0.0023	2035.18		14.81		2025.93		8.41		2009.2		10.99
29	256.00	125.86	579.36	0.22	0.1238	0.0010	6.3994	0.0598	0.3730	0.0025	2012.96		13.73		2032.18		8.33		2043.7		11.69
30	151.56	89.23	347.40	0.26	0.1210	0.0015	6.5104	0.0631	0.3746	0.0025	1972.23		22.22		2047.30		8.65		2051.0		11.60
33	453.17	369.19	1012.11	0.36	0.1226	0.0011	6.2047	0.0632	0.3653	0.0024	1994.45		16.36		2005.11		9.01		2007.1		11.28
34	112.59	101.17	246.93	0.41	0.1238	0.0012	6.2628	0.0627	0.3653	0.0023	2012.96		16.67		2013.27		8.87		2007.4		10.84
35	187.55	138.33	385.55	0.36	0.1244	0.0011	6.9647	0.0735	0.4040	0.0029	2020.37		14.97		2106.93		9.48		2187.6		13.39

图3 次井子花岗斑岩典型锆石阴极发光图像(标示年龄为206Pb/238U年龄)

Fig.3 Zircon cathodoluminescence (CL) images of granite porphyry from Cijingzi area(the zircon 206Pb/238U ages are indicated)

图4 次井子花岗斑岩锆石U-Pb年龄谐和图

Fig.4 Zircon U-Pb age concordia plots of granite porphyry from Cijingzi area

表2 次井子花岗斑岩的主量(%)和微量(10-6)元素含量

Table 2 Major element (%) and trace element (10-6) compositions of granite porphyry from Cijingzi area

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
LSS18-90	73.85	0.01	14.18	0.97	0.06	0.07	1.27	2.10	4.80	0.02	2.00	99.33
LSS18-91	74.76	0.01	13.40	1.12	0.07	0.10	1.22	3.07	3.83	0.03	1.74	99.35
LSS18-92	75.41	0.01	14.19	1.13	0.10	0.07	0.26	3.17	4.06	0.01	1.01	99.42
LSS18-93	74.18	0.01	13.94	0.93	0.05	0.11	0.84	3.02	4.55	0.01	1.47	99.11
LSS18-94	74.80	0.01	13.61	1.33	0.07	0.15	0.75	3.31	4.35	0.01	1.36	99.75
样品编号	A/CNK	Mg^#	FeO^T	Rb	Ba	Th	U	Ta	Nb	Sr	Zr	Hf
LSS18-90	1.30	0.24	0.87	268.00	315.00	8.55	2.30	1.60	12.30	30.10	58.00	3.50
LSS18-91	1.18	0.28	1.01	229.00	283.00	7.60	2.17	1.50	10.70	37.60	51.00	3.00
LSS18-92	1.41	0.21	1.02	239.00	252.00	8.76	2.25	1.60	14.20	29.70	57.00	3.60
LSS18-93	1.22	0.36	0.84	262.00	251.00	8.91	2.48	1.50	11.90	41.10	62.00	3.50
LSS18-94	1.18	0.35	1.20	247.00	273.00	8.42	2.42	1.30	9.70	40.80	55.00	3.60
样品编号	Y	Cr	Ga	La	Ce	Pr	Nd	Sm	Eu	Gd		Tb
LSS18-90	24.30	10.00	22.50	7.90	15.20	1.80	7.40	2.98	0.19	3.04		0.65
LSS18-91	22.00	20.00	20.30	7.00	13.90	1.75	7.10	2.41	0.21	3.23		0.60
LSS18-92	23.40	30.00	21.50	6.80	14.10	1.86	7.00	2.88	0.15	3.14		0.63
LSS18-93	24.10	20.00	22.70	6.90	14.70	1.73	7.40	2.83	0.17	3.02		0.61
LSS18-94	23.10	20.00	21.80	7.10	15.30	1.82	7.30	2.34	0.26	3.29		0.58
样品编号	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	LREE	HREE	LREE/HREE		δEu
LSS18-90	4.17	0.82	2.25	0.33	2.13	0.32	49.18	35.47	13.71	2.59		0.19
LSS18-91	3.80	0.78	2.18	0.33	2.25	0.33	45.87	32.37	13.50	2.40		0.23
LSS18-92	4.11	0.79	2.32	0.34	2.21	0.33	46.66	32.79	13.87	2.36		0.15
LSS18-93	3.82	0.77	2.15	0.31	2.01	0.29	46.71	33.73	12.98	2.60		0.18
LSS18-94	3.70	0.81	2.16	0.34	2.12	0.32	47.44	34.12	13.32	2.56		0.29

表2 次井子花岗斑岩的主量(%)和微量(10-6)元素含量

Table 2 Major element (%) and trace element (10-6) compositions of granite porphyry from Cijingzi area

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量
LSS18-90	73.85	0.01	14.18	0.97	0.06	0.07	1.27	2.10	4.80	0.02	2.00	99.33
LSS18-91	74.76	0.01	13.40	1.12	0.07	0.10	1.22	3.07	3.83	0.03	1.74	99.35
LSS18-92	75.41	0.01	14.19	1.13	0.10	0.07	0.26	3.17	4.06	0.01	1.01	99.42
LSS18-93	74.18	0.01	13.94	0.93	0.05	0.11	0.84	3.02	4.55	0.01	1.47	99.11
LSS18-94	74.80	0.01	13.61	1.33	0.07	0.15	0.75	3.31	4.35	0.01	1.36	99.75
样品编号	A/CNK	Mg^#	FeO^T	Rb	Ba	Th	U	Ta	Nb	Sr	Zr	Hf
LSS18-90	1.30	0.24	0.87	268.00	315.00	8.55	2.30	1.60	12.30	30.10	58.00	3.50
LSS18-91	1.18	0.28	1.01	229.00	283.00	7.60	2.17	1.50	10.70	37.60	51.00	3.00
LSS18-92	1.41	0.21	1.02	239.00	252.00	8.76	2.25	1.60	14.20	29.70	57.00	3.60
LSS18-93	1.22	0.36	0.84	262.00	251.00	8.91	2.48	1.50	11.90	41.10	62.00	3.50
LSS18-94	1.18	0.35	1.20	247.00	273.00	8.42	2.42	1.30	9.70	40.80	55.00	3.60
样品编号	Y	Cr	Ga	La	Ce	Pr	Nd	Sm	Eu	Gd		Tb
LSS18-90	24.30	10.00	22.50	7.90	15.20	1.80	7.40	2.98	0.19	3.04		0.65
LSS18-91	22.00	20.00	20.30	7.00	13.90	1.75	7.10	2.41	0.21	3.23		0.60
LSS18-92	23.40	30.00	21.50	6.80	14.10	1.86	7.00	2.88	0.15	3.14		0.63
LSS18-93	24.10	20.00	22.70	6.90	14.70	1.73	7.40	2.83	0.17	3.02		0.61
LSS18-94	23.10	20.00	21.80	7.10	15.30	1.82	7.30	2.34	0.26	3.29		0.58
样品编号	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	LREE	HREE	LREE/HREE		δEu
LSS18-90	4.17	0.82	2.25	0.33	2.13	0.32	49.18	35.47	13.71	2.59		0.19
LSS18-91	3.80	0.78	2.18	0.33	2.25	0.33	45.87	32.37	13.50	2.40		0.23
LSS18-92	4.11	0.79	2.32	0.34	2.21	0.33	46.66	32.79	13.87	2.36		0.15
LSS18-93	3.82	0.77	2.15	0.31	2.01	0.29	46.71	33.73	12.98	2.60		0.18
LSS18-94	3.70	0.81	2.16	0.34	2.12	0.32	47.44	34.12	13.32	2.56		0.29

图5 次井子花岗斑岩SiO2-(Na2O+K2O)(a)(据Middlemost[43])、(Na2O+K2O-CaO)-SiO2(b)(据Frost[44])、A/CNK-A/NK(c)(据Maniar等[45])和SiO2-FeOT/(FeOT+MgO)(d)(据Middlemost[43])图解

Fig.5 SiO2-(Na2O+K2O)(a)(after Middlemost [43]),Nb/Y-Zr/TiO2 (b)(after Rickwood [44]),A/CNK-A/NK(c)(after Maniar et al[45]) and SiO2-FeOT/(FeOT+MgO)(d)(after Middlemost[43]) of granite porphyry from Cijingzi area

图6 次井子花岗斑岩全岩球粒陨石标准化稀土元素分布图(a)和原始地幔标准化微量元素蛛网图(b)(标准化值据Sun 和 McDonough[46])

Fig.6 Chondrite-normalized REE distribution diagram(a)and primitive mantle-normalized trace elements spidergram(b)of the granite porphyry from Cijingzi (normalizing values from Sun and McDonough[46])

表3 次井子花岗斑岩锆石Hf同位素组成

Table 3 Zircon Hf isotopic composition of the granite porphyry from Cijingzi area

样品编号	年龄 (Ma)	¹⁷⁶Hf/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Yb/¹⁷⁷Hf	I_Hf/Hf	ε_Hf(t)	2σ	T_DM1(Ma)	$T D M C$ (Ma)
1	2053	0.2816827	0.00000744	0.001567109	0.04488218	0.281621467	5.21	0.263109502	2232	2335
2	2053	0.2815213	0.00000803	0.000843585	0.02232957	0.281488338	0.48	0.283974368	2410	2627
4	2053	0.2816887	0.00000811	0.000836448	0.02481311	0.281656017	6.44	0.286803502	2181	2259
6	2053	0.2816344	0.00000842	0.000971284	0.02701522	0.281596448	4.32	0.297766398	2263	2390
7	2053	0.2816184	0.00000881	0.000943779	0.02728274	0.281581523	3.79	0.311558429	2284	2422
9	2053	0.2816836	0.0000076	0.000637736	0.01849191	0.281658681	6.53	0.268767771	2177	2253
13	2053	0.2816156	0.00000821	0.000744685	0.02270614	0.281586503	3.97	0.290339921	2276	2411
17	2053	0.2816843	0.00000934	0.001674804	0.04943524	0.281618859	5.12	0.330301444	2236	2340
19	2053	0.2816668	0.00000751	0.00114751	0.03391567	0.281621963	5.23	0.265584994	2229	2334
22	2053	0.2816474	0.00000741	0.00070325	0.02073354	0.281619922	5.16	0.262048576	2230	2338
27	2053	0.2817226	0.00000813	0.001272153	0.03709011	0.281672892	7.04	0.287510786	2159	2222
29	2053	0.2816819	0.00000951	0.000901604	0.02541544	0.281646671	6.11	0.336313355	2194	2279
35	2053	0.2816684	0.00000783	0.001039094	0.02884848	0.281627799	5.44	0.276901532	2221	2321

表3 次井子花岗斑岩锆石Hf同位素组成

Table 3 Zircon Hf isotopic composition of the granite porphyry from Cijingzi area

样品编号	年龄 (Ma)	¹⁷⁶Hf/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Yb/¹⁷⁷Hf	I_Hf/Hf	ε_Hf(t)	2σ	T_DM1(Ma)	$T D M C$ (Ma)
1	2053	0.2816827	0.00000744	0.001567109	0.04488218	0.281621467	5.21	0.263109502	2232	2335
2	2053	0.2815213	0.00000803	0.000843585	0.02232957	0.281488338	0.48	0.283974368	2410	2627
4	2053	0.2816887	0.00000811	0.000836448	0.02481311	0.281656017	6.44	0.286803502	2181	2259
6	2053	0.2816344	0.00000842	0.000971284	0.02701522	0.281596448	4.32	0.297766398	2263	2390
7	2053	0.2816184	0.00000881	0.000943779	0.02728274	0.281581523	3.79	0.311558429	2284	2422
9	2053	0.2816836	0.0000076	0.000637736	0.01849191	0.281658681	6.53	0.268767771	2177	2253
13	2053	0.2816156	0.00000821	0.000744685	0.02270614	0.281586503	3.97	0.290339921	2276	2411
17	2053	0.2816843	0.00000934	0.001674804	0.04943524	0.281618859	5.12	0.330301444	2236	2340
19	2053	0.2816668	0.00000751	0.00114751	0.03391567	0.281621963	5.23	0.265584994	2229	2334
22	2053	0.2816474	0.00000741	0.00070325	0.02073354	0.281619922	5.16	0.262048576	2230	2338
27	2053	0.2817226	0.00000813	0.001272153	0.03709011	0.281672892	7.04	0.287510786	2159	2222
29	2053	0.2816819	0.00000951	0.000901604	0.02541544	0.281646671	6.11	0.336313355	2194	2279
35	2053	0.2816684	0.00000783	0.001039094	0.02884848	0.281627799	5.44	0.276901532	2221	2321

图7 次井子花岗斑岩的Zr/Hf、Nb/Ta、La/Ta和La/Nb与TE1,3关系图解 (TE1,3=(TE1×TE3)0.5,TE1=(Ce/Ce*×Pr/Pr*)0.5,TE3=(Tb/Tb*×Dy/Dy*)0.5 [48];Ce/Ce*=2×CeN/(LaN+PrN),Pr/Pr*=2×PrN/(CeN+NdN),Tb/Tb*=2×TbN/(GdN+DyN),Dy/Dy*=2×DyN/(TbN+HoN),CeN、LaN、PrN、NdN、TbN、GdN、DyN和HoN均为球粒陨石标准化值,球粒陨石数据引自Sun等[46])

Fig.7 Zr/Hf,Nb/Ta,La/Ta and La/Nb relationship diagrams with TE1,3 of the granite porphyry from Cijingzi area

图8 次井子花岗斑岩成因类型判别图解((a)据Sylvester 等[51],(b)据Whalen 等[52],(c)和(d)据Collins 等[53],(e)和(f)据Chappell 等[54]和Li 等[55])) FG.分异的I型花岗岩区;OGT.未分异的I、S和M型花岗岩区

Fig.8 Granite petrogenetic discrimination diagrams of thegranite porphyry from Cijingzi area((a) after Sylvester et al.[51];(b) after Whalen et al.[52];(c) and (d) after Collins et al[53];(e) and (f) after Chappell et al.[54] and Li et al.[55])

图9 次井子花岗斑岩分离结晶判别图解(矿物分离结晶趋势线据Wu 等[65]) Amp.角闪石;Bt.黑云母;Grt.石榴子石;Kf.钾长石;Kfs.钾长石;Ms.白云母;Pl.斜长石;PlAn50.斜长石(An=50);PlAn15.斜长石(An=15)

Fig.9 Discrimination diagram of fractional crystallization for the granite porphyry from Cijingzi(mineral fractionation trend from Wu et al.[65])

图10 次井子花岗斑岩Hf同位素组成(阴影部分代表北大山杂岩的演化趋势,据Zhang等[77])

Fig.10 Hf isotopic composition plot of the granite porphyry from Cijingzi area(shaded part represents evolution trend of Beidashan complex,after Zhang et al.[77])

图11 西阿拉善地块与孔兹岩带前寒武纪岩浆锆石和碎屑锆石年龄对比直方图 (图a1和图a2数据引自宫江华[28,39]、Zhang等[30]、Gong等[36]、Zeng等[33]和本文;图b1数据引自Xia等[94]、董春艳等[98]、周喜文等[97]、Yin等[95]、Dan等[96]、蔡佳等[100]、甘保平等[101]和庞岚尹等[102];图b2数据引自董春艳等[98]、Dan等[96]、甘保平等[101]、庞岚尹等[102]和Li等[103])

Fig.11 Age comparison histograms and corresponding magmatic zircon Hf isotopic composition of the Early Precambrian basements in the western Alxa block and Khondalite belt

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阿拉善北大山地区花岗斑岩岩石成因及构造启示:元素地球化学、锆石U-Pb年代学及Hf同位素约束

Petrogenesis and Tectonic Implications of Granite Porphyry in the Beidashan Area,Alxa Block: Constraints from Geochemistry, Zircon U-Pb Geochronology and Hf Isotopes

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