内蒙古狼山地区乌花辉长岩的年代学、地球化学和Sr-Nd-Hf同位素组成:对地幔源区特征和岩石成因的约束

doi:10.19657/j.geoscience.1000-8527.2020.010

摘要/Abstract

摘要：

内蒙古狼山地区乌花辉长岩体主要由橄榄辉长岩和角闪辉长岩组成,其锆石LA-ICP-MS U-Pb同位素测年结果表明,岩体形成于(319.8±1.8)~(325.4±1.6) Ma,属于早石炭世末期岩浆活动的产物。地球化学特征上,乌花辉长岩属低钾钙碱性玄武岩系列,具有较高的Mg^#(多在76.70~80.35之间)、Al₂O₃(13.55%~25.13%)和较低的TiO₂(0.18%~1.35%)。稀土总含量较低(∑REE= 8.92×10^-6~40.10×10^-6),稀土元素分馏程度不高,呈现出轻稀土元素(LREE)略微富集、重稀土元素(HREE)相对亏损((La/Yb)_N= 1.74~3.06)的特点,Eu呈明显的正异常(δEu=1.156~3.86)。岩石富集Pb和K、Rb、Ba、Sr等大离子亲石元素,明显亏损Nb、Ta、Zr、Hf、Th等高场强元素,较低的Zr含量(4.38×10^-6~26.6×10^-6)和Zr/Y比值(1.08~2.35),呈现出典型的俯冲-消减带弧火山岩的地球化学特征。Sr-Nd-Hf同位素研究表明,乌花辉长岩岩浆源区为富集地幔,在侵位过程中受到的地壳混染程度较弱。结合区域地质背景,认为乌花辉长岩为俯冲-消减构造体制下由俯冲带流体交代富集地幔部分熔融而成,代表了俯冲相对早期阶段的产物,指示华北板块北缘西段在早石炭世晚期开始进入到安第斯型活动大陆边缘阶段,并可能结束于早二叠世之前。

关键词: 辉长岩, 锆石U-Pb年代学, 地球化学, Sr-Nd-Hf同位素, 安第斯型活动大陆边缘, 内蒙古狼山地区

Abstract:

Two types of gabbros (i.e., olivine and hornblende gabbros) are exposed in the Wuhua gabbroic intrusions. LA-ICP-MS zircon U-Pb dating indicates that the Wuhua gabbros were emplaced in the late Early Carboniferous ((319.8±1.8) Ma to (325.4±1.6) Ma). The Wuhua gabbros are tholeiitic, with high Mg^# va-lues (mostly 76.70-80.35), high Al₂O₃ (13.55%-25.13%) and low TiO₂ (0.18%-1.35%). The rocks have low total REE contents (∑REE=8.92×10^-6-40.10×10^-6), and are featured by LREE enrichments ((La/Yb)_N=1.74-3.06) and positive Eu anomaly (δEu=1.156-3.86). The Pb and LILE (K, Rb, Ba, Sr) enrichments and HFSE (Nb, Ta, Zr, Hf, Th) depletions, and the relatively low Zr content (4.38×10^-6-26.6×10^-6) and low Zr/Y ratio (1.08-2.35) resemble those of typical subduction-related arc volcanic rocks. The Sr-Nd-Hf isotopic data show that the Wuhua gabbros were derived from an enriched mantle source, and that crustal assimilation was likely insignificant. According to geochemical data and previous regional geological studies, we consider that the Wuhua gabbros may have formed from partial melting of the hydrated and enriched lithospheric mantle wedge. The Wuhua gabbros were likely formed in the incipient subduction phase, when the western section of the northern North China Plate margin started to become an Andean-type continental arc in the late Early Carboniferous. This tectonic phase may have ended before the Early Permian.

Key words: gabbro, zircon U-Pb geochronology, geochemistry, Sr-Nd-Hf isotope, Andean-type active continental margin, Langshan, Inner Mongolia

中图分类号:

张云, 孙立新, 张天福, 孙义伟, 张祺, 李艳锋, 杨泽黎, 刘文刚. 内蒙古狼山地区乌花辉长岩的年代学、地球化学和Sr-Nd-Hf同位素组成:对地幔源区特征和岩石成因的约束[J]. 现代地质, 2020, 34(03): 450-465.

ZHANG Yun, SUN Lixin, ZHANG Tianfu, SUN Yiwei, ZHANG Qi, LI Yanfeng, YANG Zeli, LIU Wengang. Geochronology, Geochemistry and Sr-Nd-Hf Isotopic Compositions of the Wuhua Gabbros in Langshan, Inner Mongolia: Constraints for Mantle Sources and Petrogenesis[J]. Geoscience, 2020, 34(03): 450-465.

图/表 12

图1 中亚构造带构造简图[26](a)、内蒙古乌拉特后旗乌花地区大地构造位置[27,28](b)和地质图①(① 河北省区域地质矿产调查研究所. 1∶25万乌拉特后旗幅地质图. 2012.) (c) ①二连—贺根山蛇绿混杂岩带;②二道井—迪彦庙蛇绿混杂岩带;③索伦—西拉木伦蛇绿混杂岩带;④温都尔庙—车根达来—乌德—索伦山南蛇绿混杂岩带;⑤华北北缘断裂;⑥固阳—集宁—赤城断裂

Fig.1 Simplified sketch map of the Central Asian Orogenic Belt (a)[26], tectonic location (b) [27,28] and geological map①(c) for Wuhua area (Inner Mongolia)

图2 乌花辉长岩野外露头及显微照片 (a)野外宏观照片;(b)野外局部照片;(c) 橄榄辉长岩,正交偏光;(d) 角闪辉长岩,正交偏光;Ol. 橄榄石;Cpx. 单斜辉石;Opx. 斜方辉石;Plg. 斜长石;Hbl.角闪石

Fig.2 Field photographs and photomicrographs of the Wuhua gabbros

表1 乌花辉长岩样品(WH2, WH6)LA-ICP-MS 锆石U-Pb同位素测定结果

Table 1 LA-ICP-MS zircon U-Pb dating results for the Wuhua gabbros samples (WH2, WH6)

样品	测点	元素含量/10^-6		²³²Th/ ²³⁸U	同位素比值±1σ			(年龄±1σ)/Ma
样品	测点	Pb	U	²³²Th/ ²³⁸U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²³⁵U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb
WH2	1	30	604	0.28	0.050 6±0.000 7	0.360 6±0.006 3	0.051 6±0.000 8	318±4		313±6		269±35
	2	11	215	0.28	0.050 4±0.000 7	0.339 4±0.010 1	0.048 9±0.001 4	317±5		297±9		141±68
	3	39	815	0.25	0.050 0±0.000 7	0.362 2±0.006 2	0.052 5±0.000 8	315±4		314±5		307±34
	4	17	318	0.63	0.049 9±0.000 7	0.351 2±0.007 9	0.051 1±0.001 1	314±4		306±7		243±50
	5	11	208	0.51	0.051 5±0.000 7	0.368 0±0.015 5	0.051 9±0.002 2	323±4		318±13		280±97
	6	12	241	0.26	0.050 2±0.000 7	0.378 7±0.010 1	0.054 7±0.001 4	316±4		326±9		399±59
	7	9	188	0.17	0.051 8±0.000 7	0.403 8±0.017 4	0.056 6±0.002 4	325±4		344±15		475±96
	8	11	234	0.20	0.050 4±0.000 7	0.334 7±0.010 9	0.048 2±0.001 6	317±4		293±10		107±77
	9	44	889	0.23	0.051 3±0.000 7	0.378 9±0.006 3	0.053 6±0.000 8	322±4		326±5		354±33
	10	64	1 244	0.39	0.051 6±0.000 7	0.374 0±0.006 0	0.052 6±0.000 7	324±4		323±5		311±31
	11	47	946	0.34	0.050 7±0.000 7	0.360 9±0.005 8	0.051 7±0.000 7	319±4		313±5		270±32
	12	20	408	0.14	0.051 3±0.000 7	0.364 9±0.007 7	0.051 6±0.001 0	322±4		316±7		269±45
	13	12	241	0.20	0.051 5±0.000 7	0.357 2±0.010 8	0.050 3±0.001 6	324±4		310±9		210±72
	14	36	714	0.39	0.051 2±0.000 7	0.351 8±0.005 9	0.049 8±0.000 7	322±4		306±5		187±34
	15	15	293	0.37	0.050 5±0.000 7	0.368 9±0.008 5	0.053 0±0.001 2	317±4		319±7		329±49
	16	6	115	0.25	0.051 0±0.000 7	0.342 9±0.016 2	0.048 7±0.002 3	321±4		299±14		135±112
	17	6	114	0.33	0.051 2±0.000 8	0.381 2±0.017 8	0.054 0±0.002 6	322±5		328±15		373±109
	18	11	226	0.26	0.050 7±0.000 7	0.396 4±0.010 4	0.056 7±0.001 5	319±4		339±9		479±59
	19	26	539	0.18	0.050 2±0.000 7	0.362 3±0.007 0	0.052 3±0.000 9	316±4		314±6		298±41
	20	3	54	0.19	0.051 5±0.000 8	0.490 0±0.049 0	0.069 0±0.007 3	324±5		405±41		899±219
	21	12	241	0.23	0.050 7±0.000 7	0.355 0±0.009 9	0.050 7±0.001 3	319±4		308±9		229±61
	22	5	93	0.27	0.051 5±0.000 7	0.405 0±0.019 7	0.057 0±0.002 8	324±5		345±17		493±110
	23	6	134	0.15	0.051 0±0.000 7	0.385 9±0.015 4	0.054 9±0.002 3	321±5		331±13		406±92
	24	13	268	0.21	0.050 5±0.000 7	0.371 1±0.009 6	0.053 3±0.001 3	318±4		320±8		340±55
WH6	1	28	565	0.17	0.051 6±0.000 6	0.365 8±0.005 8	0.051 4±0.000 7	324±4		317±5		260±32
	2	33	677	0.25	0.050 7±0.000 6	0.371 1±0.005 9	0.053 1±0.000 7	319±4		320±5		331±31
	3	39	786	0.19	0.052 6±0.000 7	0.375 6±0.005 8	0.051 8±0.000 7	330±4		324±5		277±29
	4	24	490	0.18	0.052 4±0.000 7	0.374 4±0.006 3	0.051 9±0.000 8	329±4		323±5		279±34
	5	25	498	0.19	0.051 9±0.000 7	0.368 5±0.006 2	0.051 5±0.000 7	326±4		319±5		263±33
	6	22	443	0.17	0.051 3±0.000 6	0.372 3±0.006 2	0.052 6±0.000 8	322±4		321±5		313±35
	7	43	884	0.22	0.051 4±0.000 6	0.366 1±0.005 3	0.051 7±0.000 7	323±4		317±5		271±29
	8	25	499	0.19	0.051 6±0.000 6	0.372 4±0.006 3	0.052 3±0.000 8	325±4		321±5		299±34
	9	27	548	0.19	0.052 0±0.000 6	0.372 7±0.006 0	0.051 9±0.000 7	327±4		322±5		283±32
	10	29	597	0.17	0.050 8±0.000 6	0.367 0±0.005 6	0.052 4±0.000 7	319±4		317±5		305±32
	11	20	419	0.19	0.051 2±0.000 7	0.378 2±0.006 3	0.053 5±0.000 8	322±4		326±5		351±34
	12	32	660	0.24	0.051 2±0.000 6	0.367 9±0.005 6	0.052 1±0.000 7	322±4		318±5		290±31
	13	24	496	0.18	0.051 4±0.000 6	0.366 1±0.005 8	0.051 7±0.000 7	323±4		317±5		271±32
	14	25	497	0.20	0.051 8±0.000 7	0.376 1±0.006 2	0.052 7±0.000 8	325±4		324±5		316±33
	15	23	460	0.31	0.051 5±0.000 6	0.397 7±0.006 4	0.056 0±0.000 8	324±4		340±5		451±34
	16	15	295	0.18	0.052 7±0.000 6	0.381 2±0.006 8	0.052 4±0.000 8	331±4		328±6		304±37
	17	17	353	0.18	0.051 9±0.000 7	0.375 3±0.006 6	0.052 4±0.000 8	326±4		324±6		303±36
	18	28	554	0.23	0.052 5±0.000 6	0.376 5±0.006 1	0.052 0±0.000 8	330±4		324±5		285±33
	19	25	507	0.19	0.051 1±0.000 6	0.371 8±0.006 1	0.052 7±0.000 8	321±4		321±5		318±33
	20	26	519	0.18	0.052 2±0.000 6	0.368 7±0.006 0	0.051 2±0.000 7	328±4		319±5		251±33
	21	31	620	0.30	0.051 8±0.000 7	0.370 3±0.005 9	0.051 8±0.000 7	326±4		320±5		278±31
	22	17	341	0.20	0.052 1±0.000 7	0.368 0±0.006 6	0.051 2±0.000 8	327±4		318±6		250±37
	23	29	593	0.21	0.052 2±0.000 7	0.371 1±0.006 2	0.051 6±0.000 7	328±4		320±5		268±33
	24	26	511	0.21	0.052 9±0.000 6	0.377 9±0.006 0	0.051 8±0.000 7	332±4		325±5		276±32

表1 乌花辉长岩样品(WH2, WH6)LA-ICP-MS 锆石U-Pb同位素测定结果

Table 1 LA-ICP-MS zircon U-Pb dating results for the Wuhua gabbros samples (WH2, WH6)

样品	测点	元素含量/10^-6		²³²Th/ ²³⁸U	同位素比值±1σ			(年龄±1σ)/Ma
样品	测点	Pb	U	²³²Th/ ²³⁸U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²³⁵U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²³⁵U		²⁰⁷Pb/²⁰⁶Pb
WH2	1	30	604	0.28	0.050 6±0.000 7	0.360 6±0.006 3	0.051 6±0.000 8	318±4		313±6		269±35
	2	11	215	0.28	0.050 4±0.000 7	0.339 4±0.010 1	0.048 9±0.001 4	317±5		297±9		141±68
	3	39	815	0.25	0.050 0±0.000 7	0.362 2±0.006 2	0.052 5±0.000 8	315±4		314±5		307±34
	4	17	318	0.63	0.049 9±0.000 7	0.351 2±0.007 9	0.051 1±0.001 1	314±4		306±7		243±50
	5	11	208	0.51	0.051 5±0.000 7	0.368 0±0.015 5	0.051 9±0.002 2	323±4		318±13		280±97
	6	12	241	0.26	0.050 2±0.000 7	0.378 7±0.010 1	0.054 7±0.001 4	316±4		326±9		399±59
	7	9	188	0.17	0.051 8±0.000 7	0.403 8±0.017 4	0.056 6±0.002 4	325±4		344±15		475±96
	8	11	234	0.20	0.050 4±0.000 7	0.334 7±0.010 9	0.048 2±0.001 6	317±4		293±10		107±77
	9	44	889	0.23	0.051 3±0.000 7	0.378 9±0.006 3	0.053 6±0.000 8	322±4		326±5		354±33
	10	64	1 244	0.39	0.051 6±0.000 7	0.374 0±0.006 0	0.052 6±0.000 7	324±4		323±5		311±31
	11	47	946	0.34	0.050 7±0.000 7	0.360 9±0.005 8	0.051 7±0.000 7	319±4		313±5		270±32
	12	20	408	0.14	0.051 3±0.000 7	0.364 9±0.007 7	0.051 6±0.001 0	322±4		316±7		269±45
	13	12	241	0.20	0.051 5±0.000 7	0.357 2±0.010 8	0.050 3±0.001 6	324±4		310±9		210±72
	14	36	714	0.39	0.051 2±0.000 7	0.351 8±0.005 9	0.049 8±0.000 7	322±4		306±5		187±34
	15	15	293	0.37	0.050 5±0.000 7	0.368 9±0.008 5	0.053 0±0.001 2	317±4		319±7		329±49
	16	6	115	0.25	0.051 0±0.000 7	0.342 9±0.016 2	0.048 7±0.002 3	321±4		299±14		135±112
	17	6	114	0.33	0.051 2±0.000 8	0.381 2±0.017 8	0.054 0±0.002 6	322±5		328±15		373±109
	18	11	226	0.26	0.050 7±0.000 7	0.396 4±0.010 4	0.056 7±0.001 5	319±4		339±9		479±59
	19	26	539	0.18	0.050 2±0.000 7	0.362 3±0.007 0	0.052 3±0.000 9	316±4		314±6		298±41
	20	3	54	0.19	0.051 5±0.000 8	0.490 0±0.049 0	0.069 0±0.007 3	324±5		405±41		899±219
	21	12	241	0.23	0.050 7±0.000 7	0.355 0±0.009 9	0.050 7±0.001 3	319±4		308±9		229±61
	22	5	93	0.27	0.051 5±0.000 7	0.405 0±0.019 7	0.057 0±0.002 8	324±5		345±17		493±110
	23	6	134	0.15	0.051 0±0.000 7	0.385 9±0.015 4	0.054 9±0.002 3	321±5		331±13		406±92
	24	13	268	0.21	0.050 5±0.000 7	0.371 1±0.009 6	0.053 3±0.001 3	318±4		320±8		340±55
WH6	1	28	565	0.17	0.051 6±0.000 6	0.365 8±0.005 8	0.051 4±0.000 7	324±4		317±5		260±32
	2	33	677	0.25	0.050 7±0.000 6	0.371 1±0.005 9	0.053 1±0.000 7	319±4		320±5		331±31
	3	39	786	0.19	0.052 6±0.000 7	0.375 6±0.005 8	0.051 8±0.000 7	330±4		324±5		277±29
	4	24	490	0.18	0.052 4±0.000 7	0.374 4±0.006 3	0.051 9±0.000 8	329±4		323±5		279±34
	5	25	498	0.19	0.051 9±0.000 7	0.368 5±0.006 2	0.051 5±0.000 7	326±4		319±5		263±33
	6	22	443	0.17	0.051 3±0.000 6	0.372 3±0.006 2	0.052 6±0.000 8	322±4		321±5		313±35
	7	43	884	0.22	0.051 4±0.000 6	0.366 1±0.005 3	0.051 7±0.000 7	323±4		317±5		271±29
	8	25	499	0.19	0.051 6±0.000 6	0.372 4±0.006 3	0.052 3±0.000 8	325±4		321±5		299±34
	9	27	548	0.19	0.052 0±0.000 6	0.372 7±0.006 0	0.051 9±0.000 7	327±4		322±5		283±32
	10	29	597	0.17	0.050 8±0.000 6	0.367 0±0.005 6	0.052 4±0.000 7	319±4		317±5		305±32
	11	20	419	0.19	0.051 2±0.000 7	0.378 2±0.006 3	0.053 5±0.000 8	322±4		326±5		351±34
	12	32	660	0.24	0.051 2±0.000 6	0.367 9±0.005 6	0.052 1±0.000 7	322±4		318±5		290±31
	13	24	496	0.18	0.051 4±0.000 6	0.366 1±0.005 8	0.051 7±0.000 7	323±4		317±5		271±32
	14	25	497	0.20	0.051 8±0.000 7	0.376 1±0.006 2	0.052 7±0.000 8	325±4		324±5		316±33
	15	23	460	0.31	0.051 5±0.000 6	0.397 7±0.006 4	0.056 0±0.000 8	324±4		340±5		451±34
	16	15	295	0.18	0.052 7±0.000 6	0.381 2±0.006 8	0.052 4±0.000 8	331±4		328±6		304±37
	17	17	353	0.18	0.051 9±0.000 7	0.375 3±0.006 6	0.052 4±0.000 8	326±4		324±6		303±36
	18	28	554	0.23	0.052 5±0.000 6	0.376 5±0.006 1	0.052 0±0.000 8	330±4		324±5		285±33
	19	25	507	0.19	0.051 1±0.000 6	0.371 8±0.006 1	0.052 7±0.000 8	321±4		321±5		318±33
	20	26	519	0.18	0.052 2±0.000 6	0.368 7±0.006 0	0.051 2±0.000 7	328±4		319±5		251±33
	21	31	620	0.30	0.051 8±0.000 7	0.370 3±0.005 9	0.051 8±0.000 7	326±4		320±5		278±31
	22	17	341	0.20	0.052 1±0.000 7	0.368 0±0.006 6	0.051 2±0.000 8	327±4		318±6		250±37
	23	29	593	0.21	0.052 2±0.000 7	0.371 1±0.006 2	0.051 6±0.000 7	328±4		320±5		268±33
	24	26	511	0.21	0.052 9±0.000 6	0.377 9±0.006 0	0.051 8±0.000 7	332±4		325±5		276±32

图3 乌花辉长岩样品锆石U-Pb谐和图及锆石CL图 (a)和(b)为样品WH2锆石U-Pb谐和图及CL图;(c)和(d)为样品WH6锆石U-Pb谐和图及锆石CL图

Fig.3 U-Pb concordia diagrams and CL images of zircons from the Wuhua gabbros samples

表2 乌花辉长岩主量元素(%)和微量元素(10-6)分析结果

Table 2 Major element (%) and trace element compositions (10-6) of the Wuhua gabbros

样品	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO	烧失量	总量	Mg^#
WH1	48.88	13.55	1.44	7.33	10.52	14.16	0.15	1.55	0.37	0.015	0.140	1.08	99.19	74.71
WH2	49.69	16.69	1.25	3.62	16.16	7.45	0.35	2.05	0.68	0.015	0.086	1.56	99.60	73.86
WH3	52.56	19.55	2.53	4.75	8.39	3.36	0.57	4.64	1.35	0.270	0.130	1.37	99.47	46.26
WH4	49.58	19.45	1.55	3.15	11.63	8.48	0.22	2.34	0.30	0.015	0.073	2.87	99.66	77.06
WH5	50.64	25.13	0.70	1.63	11.13	4.24	0.13	4.00	0.18	0.012	0.040	1.98	99.81	77.15
WH6	49.93	21.47	0.48	2.45	14.08	5.62	0.42	2.58	0.38	0.019	0.064	2.25	99.74	77.83
样品	FeO_T	SI	Cu	Pb	Zn	Cr	Ni	Co	Rb	Cs	Sb	Sr	Ba	V
WH1	8.63	57.49	14.10	1.45	61.1	447.0	97.6	64.6	5.4	1.01	0.014	319	50.1	142.0
WH2	4.74	50.61	8.68	1.75	31.8	196.0	40.5	32.4	10.8	0.65	0.023	358	75.2	172.0
WH3	7.03	21.20	20.30	3.71	62.1	39.6	12.7	17.8	7.3	1.07	0.033	558	193.0	101.0
WH4	4.54	53.88	12.00	1.12	28.5	403.0	82.3	35.4	5.8	1.00	0.140	364	117.0	107.0
WH5	2.26	39.63	3.74	1.43	17.8	129.0	39.1	12.6	4.8	1.78	0.130	481	70.0	60.2
WH6	2.88	48.66	9.18	2.00	22.0	253.0	28.0	18.1	12.6	0.87	0.022	416	103.0	165.0
样品	Sc	Nb	Ta	Zr	Hf	Ga	U	Th	La	Ce	Pr	Nd	Sm	Eu
WH1	31.60	0.36	0.058	11.70	0.52	12.2	0.036	0.280	2.32	5.29	0.86	4.52	1.38	0.66
WH2	26.40	0.43	0.060	26.60	1.13	15.8	0.080	0.390	2.74	7.04	1.22	6.52	2.00	0.78
WH3	12.80	2.19	0.170	12.80	0.46	19.6	0.120	0.270	5.21	11.60	1.79	8.92	2.32	1.82
WH4	20.50	0.18	0.023	9.14	0.38	14.9	0.100	0.120	1.48	3.42	0.55	2.89	0.89	0.62
WH5	8.36	0.11	0.015	4.38	0.18	15.2	0.069	0.066	1.15	2.50	0.36	1.72	0.48	0.64
WH6	21.80	0.48	0.041	16.30	0.61	14.9	0.120	0.280	2.26	5.46	0.89	4.54	1.36	0.90
样品	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	(La/Yb)_N	δEu
WH1	1.58	0.290	1.85	0.36	0.99	0.140	0.94	0.140	9.22	21.32	1.77	1.36
WH2	2.10	0.400	2.40	0.46	1.22	0.170	1.13	0.160	11.30	28.34	1.74	1.15
WH3	2.23	0.410	2.45	0.48	1.28	0.190	1.22	0.180	11.90	40.10	3.06	2.41
WH4	0.96	0.180	1.18	0.23	0.61	0.088	0.56	0.086	5.48	13.74	1.90	2.04
WH5	0.53	0.095	0.59	0.12	0.33	0.042	0.31	0.049	2.92	8.92	2.66	3.86
WH6	1.45	0.280	1.75	0.34	0.92	0.120	0.84	0.130	8.03	21.24	1.93	1.95

表2 乌花辉长岩主量元素(%)和微量元素(10-6)分析结果

Table 2 Major element (%) and trace element compositions (10-6) of the Wuhua gabbros

样品	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	P₂O₅	MnO	烧失量	总量	Mg^#
WH1	48.88	13.55	1.44	7.33	10.52	14.16	0.15	1.55	0.37	0.015	0.140	1.08	99.19	74.71
WH2	49.69	16.69	1.25	3.62	16.16	7.45	0.35	2.05	0.68	0.015	0.086	1.56	99.60	73.86
WH3	52.56	19.55	2.53	4.75	8.39	3.36	0.57	4.64	1.35	0.270	0.130	1.37	99.47	46.26
WH4	49.58	19.45	1.55	3.15	11.63	8.48	0.22	2.34	0.30	0.015	0.073	2.87	99.66	77.06
WH5	50.64	25.13	0.70	1.63	11.13	4.24	0.13	4.00	0.18	0.012	0.040	1.98	99.81	77.15
WH6	49.93	21.47	0.48	2.45	14.08	5.62	0.42	2.58	0.38	0.019	0.064	2.25	99.74	77.83
样品	FeO_T	SI	Cu	Pb	Zn	Cr	Ni	Co	Rb	Cs	Sb	Sr	Ba	V
WH1	8.63	57.49	14.10	1.45	61.1	447.0	97.6	64.6	5.4	1.01	0.014	319	50.1	142.0
WH2	4.74	50.61	8.68	1.75	31.8	196.0	40.5	32.4	10.8	0.65	0.023	358	75.2	172.0
WH3	7.03	21.20	20.30	3.71	62.1	39.6	12.7	17.8	7.3	1.07	0.033	558	193.0	101.0
WH4	4.54	53.88	12.00	1.12	28.5	403.0	82.3	35.4	5.8	1.00	0.140	364	117.0	107.0
WH5	2.26	39.63	3.74	1.43	17.8	129.0	39.1	12.6	4.8	1.78	0.130	481	70.0	60.2
WH6	2.88	48.66	9.18	2.00	22.0	253.0	28.0	18.1	12.6	0.87	0.022	416	103.0	165.0
样品	Sc	Nb	Ta	Zr	Hf	Ga	U	Th	La	Ce	Pr	Nd	Sm	Eu
WH1	31.60	0.36	0.058	11.70	0.52	12.2	0.036	0.280	2.32	5.29	0.86	4.52	1.38	0.66
WH2	26.40	0.43	0.060	26.60	1.13	15.8	0.080	0.390	2.74	7.04	1.22	6.52	2.00	0.78
WH3	12.80	2.19	0.170	12.80	0.46	19.6	0.120	0.270	5.21	11.60	1.79	8.92	2.32	1.82
WH4	20.50	0.18	0.023	9.14	0.38	14.9	0.100	0.120	1.48	3.42	0.55	2.89	0.89	0.62
WH5	8.36	0.11	0.015	4.38	0.18	15.2	0.069	0.066	1.15	2.50	0.36	1.72	0.48	0.64
WH6	21.80	0.48	0.041	16.30	0.61	14.9	0.120	0.280	2.26	5.46	0.89	4.54	1.36	0.90
样品	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	(La/Yb)_N	δEu
WH1	1.58	0.290	1.85	0.36	0.99	0.140	0.94	0.140	9.22	21.32	1.77	1.36
WH2	2.10	0.400	2.40	0.46	1.22	0.170	1.13	0.160	11.30	28.34	1.74	1.15
WH3	2.23	0.410	2.45	0.48	1.28	0.190	1.22	0.180	11.90	40.10	3.06	2.41
WH4	0.96	0.180	1.18	0.23	0.61	0.088	0.56	0.086	5.48	13.74	1.90	2.04
WH5	0.53	0.095	0.59	0.12	0.33	0.042	0.31	0.049	2.92	8.92	2.66	3.86
WH6	1.45	0.280	1.75	0.34	0.92	0.120	0.84	0.130	8.03	21.24	1.93	1.95

图4 乌花辉长岩岩石类型及系列划分图解 (a) 硅-碱图(TAS)(底图据文献[40]);(b) SiO2-FeOT/ MgO图解(底图据文献[41]);(c) AFM图解(底图据文献[42],岛弧相关镁铁质-超镁铁质堆晶岩投图区域数据来自文献[43]);(d) SiO2-K2O图解(底图据文献[44])

Fig.4 Geochemical classification diagrams for the Wuhua gabbros

图5 乌花辉长岩稀土元素配分型式图(a)与微量元素蛛网图(b)(球粒陨石、原始地幔数据及OIB、E-MORB、N-MORB数据均引自文献[39]) OIB.洋岛玄武岩;E-MORB. 富集洋脊玄武岩;N-MORB. 正常洋脊玄武岩

Fig. 5 Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) for the Wuhua gabbros

表3 乌花辉长岩锆石Hf同位素组成

Table 3 Zircon Hf isotopic compositions of the Wuhua gabbros

样品	测点	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(0)	ε_Hf(t)	T_DM/Ma	$T D M 2$ /Ma	$f Lu / Hf$
WH2	WH2-01	318	0.045 237	0.001 688	0.282 740±0.000 034	0.282 730	-1.1	5.5	740	977	-0.95
	WH2-02	317	0.012 555	0.000 479	0.282 800±0.000 021	0.282 797	1.0	7.9	633	826	-0.99
	WH2-03	315	0.019 398	0.000 751	0.282 702±0.000 021	0.282 698	-2.5	4.3	775	1 052	-0.98
	WH2-04	314	0.006 389	0.000 251	0.282 706±0.000 019	0.282 704	-2.3	4.5	759	1 037	-0.99
	WH2-05	323	0.017 259	0.000 770	0.282 721±0.000 019	0.282 716	-1.8	5.1	748	1 004	-0.98
	WH2-06	316	0.012 858	0.000 486	0.282 757±0.000 021	0.282 755	-0.5	6.3	692	923	-0.99
	WH2-07	325	0.025 004	0.001 127	0.282 690±0.000 027	0.282 684	-2.9	4.0	799	1 077	-0.97
	WH2-08	317	0.014 292	0.000 580	0.282 800±0.000 026	0.282 797	1.0	7.8	634	828	-0.98
	WH2-09	322	0.033 738	0.001 121	0.282 730±0.000 024	0.282 723	-1.5	5.4	743	989	-0.97
	WH2-10	324	0.031 082	0.001 096	0.282 777±0.000 025	0.282 770	0.2	7.1	676	882	-0.97
	WH2-11	319	0.016 355	0.000 610	0.282 705±0.000 019	0.282 701	-2.4	4.5	768	1 042	-0.98
	WH2-12	322	0.043 522	0.001 540	0.282 742±0.000 025	0.282 733	-1.1	5.7	734	968	-0.95
	WH2-13	324	0.031 540	0.001 220	0.282 836±0.000 022	0.282 829	2.3	9.1	593	750	-0.96
	WH2-14	322	0.016 344	0.000 572	0.282 679±0.000 018	0.282 676	-3.3	3.7	803	1 096	-0.98
	WH2-15	317	0.009 519	0.000 369	0.282 735±0.000 018	0.282 733	-1.3	5.6	721	970	-0.99
	WH2-16	321	0.012 294	0.000 434	0.282 765±0.000 019	0.282 762	-0.3	6.7	681	902	-0.99
	WH2-17	322	0.016 203	0.000 545	0.282 673±0.000 018	0.282 670	-3.5	3.5	811	1 110	-0.98
	WH2-18	319	0.017 294	0.000 736	0.282 770±0.000 022	0.282 766	-0.1	6.8	678	895	-0.98
	WH2-19	316	0.027 479	0.001 139	0.282 792±0.000 022	0.282 785	0.7	7.4	655	853	-0.97
	WH2-20	324	0.015 065	0.000 591	0.282 901±0.000 024	0.282 898	4.6	11.6	492	595	-0.98
	WH2-21	319	0.017 141	0.000 707	0.282 708±0.000 023	0.282 703	-2.3	4.6	766	1 036	-0.98
	WH2-22	324	0.010 288	0.000 404	0.282 760±0.000 020	0.282 758	-0.4	6.6	687	911	-0.99
	WH2-23	321	0.005 384	0.000 206	0.282 727±0.000 019	0.282 726	-1.6	5.4	729	984	-0.99
	WH2-24	318	0.035 732	0.001 271	0.282 764±0.000 029	0.282 757	-0.3	6.4	697	917	-0.96
WH6	WH6-1	324	0.025 017	0.000 858	0.282 564±0.000 020	0.282 559	-7.4	-0.4	971	1 357	-0.97
	WH6-2	319	0.019 247	0.000 691	0.282 608±0.000 019	0.282 604	-5.8	1.1	906	1 260	-0.98
	WH6-3	330	0.033 236	0.001 129	0.282 607±0.000 019	0.282 600	-5.8	1.2	917	1 261	-0.97
	WH6-4	329	0.020 585	0.000741	0.282 616±0.000 020	0.282 611	-5.5	1.5	895	1 236	-0.98
	WH6-5	326	0.021 169	0.000 777	0.282 613±0.000 020	0.282 608	-5.6	1.4	901	1 246	-0.98
	WH6-6	322	0.018 667	0.000 666	0.282 531±0.000 019	0.282 527	-8.5	-1.6	1 011	1 429	-0.98
	WH6-7	323	0.026 089	0.000 949	0.282 636±0.000 019	0.282 631	-4.8	2.1	872	1 197	-0.97
	WH6-8	325	0.025 977	0.000 937	0.282 635±0.000 019	0.282 630	-4.8	2.1	873	119	-0.97
	WH6-9	327	0.023 481	0.000 843	0.282 553±0.000 020	0.282 548	-7.7	-0.7	986	1 380	-0.97
	WH6-10	319	0.022 113	0.000 856	0.282 645±0.000 020	0.282 640	-4.5	2.3	858	1 179	-0.97
	WH6-11	322	0.016 130	0.000 554	0.282 603±0.000 019	0.282 600	-6.0	1.0	909	1 267	-0.98
	WH6-12	322	0.025 055	0.000 866	0.282 608±0.000 021	0.282 603	-5.8	1.1	910	1 260	-0.97
	WH6-13	323	0.021 627	0.000 760	0.282 462	0.282 458	-11.0	-4.0	1 110	1 584	-0.98
	WH6-14	325	0.021 670	0.000 777	0.282 673±0.000 022	0.282 668	-3.5	3.5	816	1 111	-0.98
	WH6-15	324	0.044 044	0.001 471	0.282 536	0.282 527	-8.4	-1.6	1 027	1 429	-0.96
	WH6-16	331	0.016 226	0.000 557	0.282 618±0.000 021	0.282 614	-5.5	1.7	889	1 229	-0.98
	WH6-17	326	0.021 164	0.000 739	0.282 570±0.000 019	0.282 566	-7.1	-0.1	959	1 341	-0.98
	WH6-18	330	0.027 762	0.000 962	0.282 608±0.000 019	0.282 602	-5.8	1.3	911	1 256	-0.97
	WH6-19	321	0.021 765	0.000 794	0.282 559±0.000 020	0.282 555	-7.5	-0.6	976	1 369	-0.98
	WH6-20	328	0.018 587	0.000 708	0.282 607±0.000 016	0.282 603	-5.8	1.2	907	1 256	-0.98
	WH6-21	326	0.030 629	0.001 014	0.282 579±0.000 025	0.282 573	-6.8	0.1	954	1 325	-0.97
	WH6-22	327	0.029 201	0.000 973	0.282 543±0.000 021	0.282 537	-8.1	-1.1	1 003	1 404	-0.97
	WH6-23	328	0.021 176	0.000 620	0.282 490	0.282 486	-10.0	-2.9	1 068	1 518	-0.98
	WH6-24	332	0.013 668	0.000 494	0.282 589±0.000 018	0.282 586	-6.5	0.7	926	1 290	-0.99

表3 乌花辉长岩锆石Hf同位素组成

Table 3 Zircon Hf isotopic compositions of the Wuhua gabbros

样品	测点	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(0)	ε_Hf(t)	T_DM/Ma	$T D M 2$ /Ma	$f Lu / Hf$
WH2	WH2-01	318	0.045 237	0.001 688	0.282 740±0.000 034	0.282 730	-1.1	5.5	740	977	-0.95
	WH2-02	317	0.012 555	0.000 479	0.282 800±0.000 021	0.282 797	1.0	7.9	633	826	-0.99
	WH2-03	315	0.019 398	0.000 751	0.282 702±0.000 021	0.282 698	-2.5	4.3	775	1 052	-0.98
	WH2-04	314	0.006 389	0.000 251	0.282 706±0.000 019	0.282 704	-2.3	4.5	759	1 037	-0.99
	WH2-05	323	0.017 259	0.000 770	0.282 721±0.000 019	0.282 716	-1.8	5.1	748	1 004	-0.98
	WH2-06	316	0.012 858	0.000 486	0.282 757±0.000 021	0.282 755	-0.5	6.3	692	923	-0.99
	WH2-07	325	0.025 004	0.001 127	0.282 690±0.000 027	0.282 684	-2.9	4.0	799	1 077	-0.97
	WH2-08	317	0.014 292	0.000 580	0.282 800±0.000 026	0.282 797	1.0	7.8	634	828	-0.98
	WH2-09	322	0.033 738	0.001 121	0.282 730±0.000 024	0.282 723	-1.5	5.4	743	989	-0.97
	WH2-10	324	0.031 082	0.001 096	0.282 777±0.000 025	0.282 770	0.2	7.1	676	882	-0.97
	WH2-11	319	0.016 355	0.000 610	0.282 705±0.000 019	0.282 701	-2.4	4.5	768	1 042	-0.98
	WH2-12	322	0.043 522	0.001 540	0.282 742±0.000 025	0.282 733	-1.1	5.7	734	968	-0.95
	WH2-13	324	0.031 540	0.001 220	0.282 836±0.000 022	0.282 829	2.3	9.1	593	750	-0.96
	WH2-14	322	0.016 344	0.000 572	0.282 679±0.000 018	0.282 676	-3.3	3.7	803	1 096	-0.98
	WH2-15	317	0.009 519	0.000 369	0.282 735±0.000 018	0.282 733	-1.3	5.6	721	970	-0.99
	WH2-16	321	0.012 294	0.000 434	0.282 765±0.000 019	0.282 762	-0.3	6.7	681	902	-0.99
	WH2-17	322	0.016 203	0.000 545	0.282 673±0.000 018	0.282 670	-3.5	3.5	811	1 110	-0.98
	WH2-18	319	0.017 294	0.000 736	0.282 770±0.000 022	0.282 766	-0.1	6.8	678	895	-0.98
	WH2-19	316	0.027 479	0.001 139	0.282 792±0.000 022	0.282 785	0.7	7.4	655	853	-0.97
	WH2-20	324	0.015 065	0.000 591	0.282 901±0.000 024	0.282 898	4.6	11.6	492	595	-0.98
	WH2-21	319	0.017 141	0.000 707	0.282 708±0.000 023	0.282 703	-2.3	4.6	766	1 036	-0.98
	WH2-22	324	0.010 288	0.000 404	0.282 760±0.000 020	0.282 758	-0.4	6.6	687	911	-0.99
	WH2-23	321	0.005 384	0.000 206	0.282 727±0.000 019	0.282 726	-1.6	5.4	729	984	-0.99
	WH2-24	318	0.035 732	0.001 271	0.282 764±0.000 029	0.282 757	-0.3	6.4	697	917	-0.96
WH6	WH6-1	324	0.025 017	0.000 858	0.282 564±0.000 020	0.282 559	-7.4	-0.4	971	1 357	-0.97
	WH6-2	319	0.019 247	0.000 691	0.282 608±0.000 019	0.282 604	-5.8	1.1	906	1 260	-0.98
	WH6-3	330	0.033 236	0.001 129	0.282 607±0.000 019	0.282 600	-5.8	1.2	917	1 261	-0.97
	WH6-4	329	0.020 585	0.000741	0.282 616±0.000 020	0.282 611	-5.5	1.5	895	1 236	-0.98
	WH6-5	326	0.021 169	0.000 777	0.282 613±0.000 020	0.282 608	-5.6	1.4	901	1 246	-0.98
	WH6-6	322	0.018 667	0.000 666	0.282 531±0.000 019	0.282 527	-8.5	-1.6	1 011	1 429	-0.98
	WH6-7	323	0.026 089	0.000 949	0.282 636±0.000 019	0.282 631	-4.8	2.1	872	1 197	-0.97
	WH6-8	325	0.025 977	0.000 937	0.282 635±0.000 019	0.282 630	-4.8	2.1	873	119	-0.97
	WH6-9	327	0.023 481	0.000 843	0.282 553±0.000 020	0.282 548	-7.7	-0.7	986	1 380	-0.97
	WH6-10	319	0.022 113	0.000 856	0.282 645±0.000 020	0.282 640	-4.5	2.3	858	1 179	-0.97
	WH6-11	322	0.016 130	0.000 554	0.282 603±0.000 019	0.282 600	-6.0	1.0	909	1 267	-0.98
	WH6-12	322	0.025 055	0.000 866	0.282 608±0.000 021	0.282 603	-5.8	1.1	910	1 260	-0.97
	WH6-13	323	0.021 627	0.000 760	0.282 462	0.282 458	-11.0	-4.0	1 110	1 584	-0.98
	WH6-14	325	0.021 670	0.000 777	0.282 673±0.000 022	0.282 668	-3.5	3.5	816	1 111	-0.98
	WH6-15	324	0.044 044	0.001 471	0.282 536	0.282 527	-8.4	-1.6	1 027	1 429	-0.96
	WH6-16	331	0.016 226	0.000 557	0.282 618±0.000 021	0.282 614	-5.5	1.7	889	1 229	-0.98
	WH6-17	326	0.021 164	0.000 739	0.282 570±0.000 019	0.282 566	-7.1	-0.1	959	1 341	-0.98
	WH6-18	330	0.027 762	0.000 962	0.282 608±0.000 019	0.282 602	-5.8	1.3	911	1 256	-0.97
	WH6-19	321	0.021 765	0.000 794	0.282 559±0.000 020	0.282 555	-7.5	-0.6	976	1 369	-0.98
	WH6-20	328	0.018 587	0.000 708	0.282 607±0.000 016	0.282 603	-5.8	1.2	907	1 256	-0.98
	WH6-21	326	0.030 629	0.001 014	0.282 579±0.000 025	0.282 573	-6.8	0.1	954	1 325	-0.97
	WH6-22	327	0.029 201	0.000 973	0.282 543±0.000 021	0.282 537	-8.1	-1.1	1 003	1 404	-0.97
	WH6-23	328	0.021 176	0.000 620	0.282 490	0.282 486	-10.0	-2.9	1 068	1 518	-0.98
	WH6-24	332	0.013 668	0.000 494	0.282 589±0.000 018	0.282 586	-6.5	0.7	926	1 290	-0.99

图6 乌花辉长岩岩体(87Sr/86Sr)i-εNd(t)(a)和t-εHf(t)关系图(b) DM.亏损地幔;MORB.洋中脊玄武岩;OIB.洋岛玄武岩;EM Ι. Ι型富集地幔;EMⅡ. Ⅱ型富集地幔

Fig. 6 (87Sr/86Sr)i-εNd(t) diagram (a) and t-εHf(t) diagram (b) for the Wuhua gabbros

表4 乌花辉长岩体全岩Sr-Nd同位素组成

Table 4 Whole-rock Sr-Nd isotopic composition of the Wuhua gabbroic intrusion

样品	年龄/Ma	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr(2σ)	(⁸⁷Sr/⁸⁶Sr)_i	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd(2σ)	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(t)	$f Sm / Nd$	$T D M 2$ /Ga
WH1	325	0.048 973	0.706 628(5)	0.706 405	0.193 077	0.512 821(10)	0.512 417	3.72	-0.02	0.78
WH6	325	0.087 625	0.706 480(9)	0.706 081	0.189 440	0.512 663(5)	0.512 266	0.78	-0.04	1.01

表4 乌花辉长岩体全岩Sr-Nd同位素组成

Table 4 Whole-rock Sr-Nd isotopic composition of the Wuhua gabbroic intrusion

样品	年龄/Ma	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr(2σ)	(⁸⁷Sr/⁸⁶Sr)_i	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd(2σ)	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(t)	$f Sm / Nd$	$T D M 2$ /Ga
WH1	325	0.048 973	0.706 628(5)	0.706 405	0.193 077	0.512 821(10)	0.512 417	3.72	-0.02	0.78
WH6	325	0.087 625	0.706 480(9)	0.706 081	0.189 440	0.512 663(5)	0.512 266	0.78	-0.04	1.01

图7 乌花辉长岩多元素对Zr含量图解

Fig.7 Elements vs. Zr diagrams for the Wuhua gabbros

图8 乌花辉长岩岩石成因判别图解 (a) TiO2-K2O-P2O5图解(底图据文献[65]);(b) Hf-Th-Ta图解(底图据文献[66]);(c) Y-La-Nb图解(底图据文献[44]);(d) Th/Zr-Nb/Zr图解(底图据文献[67,68])。N-MORB.正常洋脊玄武岩;E-MORB.富集型洋脊玄武岩;WPAB.板内碱性玄武岩;WPT.板内拉斑玄武岩;VAB.火山弧玄武岩;IAT.初始岛弧拉斑玄武岩;CAB.钙碱性岛弧玄武岩;1A.钙碱性玄武岩;1B.1A和1C的过渡区;1C.岛弧拉斑玄武岩;2A.大陆玄武岩;2B.弧后盆地玄武岩;3A.碱性玄武岩;3B+3C.富集型洋脊玄武岩;3D.正常洋脊玄武岩

Fig.8 Tectonic discrimination diagrams for the Wuhua gabbros

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