太行山南段西安里早白垩世角闪辉长岩的成因: 锆石U-Pb年龄、Hf同位素和岩石地球化学证据

王春光; 许文良; 王枫; 杨德彬

doi:10.3799/dqkx.2011.049

太行山南段西安里早白垩世角闪辉长岩的成因: 锆石U-Pb年龄、Hf同位素和岩石地球化学证据

doi: 10.3799/dqkx.2011.049

吉林大学地球科学学院, 吉林长春 130061

基金项目:

国家自然科学基金 90814003

教育部高校博士学科点基金 200801830039

详细信息

作者简介:
王春光(1986-), 男, 硕士研究生, 研究方向为矿物学、岩石学和矿床学

通讯作者:
许文良, E-mail: xuwl@jlu.edu.cn

中图分类号: P597
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出版历程
- 收稿日期: 2010-12-18
- 刊出日期: 2011-05-01

Petrogenesis of the Early Cretaceous Xi'anli Hornblende-Gabbros from the Southern Taihang Mountains: Evidence from Zircon U-Pb Geochronology, Hf Isotope and Whole-Rock Geochemistry

College of Earth Science, Jilin University, Changchun 130061, China

摘要

摘要: 介绍了太行山南段西安里岩体角闪辉长岩的锆石U-Pb年代学、锆石Hf同位素以及岩石地球化学资料, 以便对该类岩石的成因给予制约.西安里岩体主要由一套含橄榄石角闪辉长岩-角闪闪长岩-闪长岩构成.角闪辉长岩中的锆石自形程度较高, 内部结构均匀, 呈条痕状吸收, Th/U值介于1.44~2.85之间, 表现出岩浆成因特征, 其²⁰⁶Pb/²³⁸U年龄介于135~127 Ma之间, 15个点的加权平均年龄为131±1 Ma, 即角闪辉长岩形成于早白垩世; 锆石的ε_Hf(t)值介于-23.5~-19.2之间.角闪辉长岩中SiO₂=50.27%~50.89%, Mg^#=0.76~0.78, Na₂O/K₂O=2.18~2.37, 富含过渡族元素Sc (19.2~20.3)×10^-6、Cr (939~1 050)×10^-6、Co (54.6~58.2)×10^-6、Ni (645~718)×10^-6.同时角闪辉长岩相对富含大离子亲石元素(LILEs, 如Cs、Ba、Sr)和轻稀土元素(LREEs)、强烈亏损高场强元素(HFSEs, 如Nb、Ta、Zr、Hf)和重稀土元素(HREEs).结合角闪辉长岩中纯橄岩包体和橄榄石捕虏晶的矿物化学和地球化学研究, 认为西安里角闪辉长岩是拆沉的陆壳物质熔融的熔体与地幔橄榄岩反应的产物.
- 早白垩世 /
- 角闪辉长岩 /
- 岩石成因 /
- 地球化学 /
- 地质年代 /
- 太行山南段
Abstract: This paper reports zircon U-Pb geochronology, Hf isotope, and whole-rock geochemical data, aimed at constraining the petrogenesis of the hornblende (Hb)-gabbros from the Xi'anli intrusion in the southern Taihang Mountains (Mts.). The intrusion is composed mainly of olivine-bearing Hb-gabbro, Hb-diorite, and diorite. Zircons from the Hb-gabbros display euhedral shape and zonal homogeneous absorption on CL images, and have high Th/U ratio (1.44-2.85), suggesting a magmatic origin. Their ²⁰⁶Pb/²³⁸U ages range from 135 to 127 Ma, yielding a mean age of 131±1 Ma (MSWD=6.5, n=15), which suggests that the Xi'anli Hb-gabbros were formed in the Early Cretaceous. The ε_Hf(t) values of selected zircons range from -23.5 to -19.2. The Xi'anli Hb-gabbros have SiO₂ = 50.27%-50.89%, Mg^# =0.76-0.78, and Na₂O/K₂O= 2.18-2.37, and are enriched in transitional elements such as Sc (19.2-20.3)×10^-6, Cr (939-1 050)×10^-6, Co (54.6-58.2)×10^-6, and Ni (645-718)×10^-6. Moreover, these gabbros are characterized by relative enrichment in large ion lithophile elements (LILEs, such as Cs, Ba, Sr) and light rare earth elements (LREEs), and intensive depletion in high field strength elements (HFSEs, such as Nb, Ta, Zr, Hf) and heavy rare earth elements (HREEs). Combined with the mineralogical and geochemical study of the dunite xenolith and the olivine xenocrysts hosted in the Hb-gabbros, we propose that the Xi'anli Hb-gabbros may have been produced by the reaction of the delaminated lower continental crust-derived melt and mantle peridotite.
- Early Cretaceous /
- hornblende-gabbro /
- petrogenesis /
- geochemistry /
- geochronology /
- southern Taihang Mts

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图 1 太行山南段和西安里岩体地质略图

a.华北克拉通构造分区简图；b.太行山南段地质略图；c.西安里岩体地质略图；华北克拉通的3个基本构造单元：西部陆块，中部带和东部陆块参考Zhao et al.(2001)

Fig. 1. Geologic sketch map of the southern Taihang Mts. and the Xi'anli intrusion

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图 2 角闪辉长岩和纯橄岩捕虏体的产状与结构

a.纯橄岩捕虏体的野外产状；b.角闪辉长岩的似斑状结构(单偏光)；c.角闪辉长岩中橄榄石捕虏晶(单偏光)；Hb.普通角闪石；Ol.橄榄石；Pl.斜长石；Opx.斜方辉石

Fig. 2. Field photographs and photomicrographs showing the occurrence of dunite xenolith and texture of Hb-gabbros

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图 3 西安里角闪辉长岩中代表性锆石的阴极发光图像

实线圈代表U-Pb年龄分析点，虚线圈代表Hf同位素分析点

Fig. 3. CL images of selected zircons from the Xi'anli Hb-gabbro

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图 4 西安里角闪辉长岩中锆石U-Pb年龄谐和图

Fig. 4. Concordia diagram showing age data derived from LA-ICP-MS zircon U-Pb dating of the Xi'anli Hb-gabbro

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图 5 西安里角闪辉长岩的TAS图解

碱性和亚碱性系列之间的界限引自Irvine and Baragar(1971)

Fig. 5. Total alkali vs. SiO₂ variation diagram for the Xi'anli Hb-gabbros

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图 6 西安里角闪辉长岩的球粒陨石标准化稀土元素配分型式(a)和原始地幔标准化微量元素蛛网图(b)

球粒陨石标准化数据引自Boynton(1984)；原始地幔标准化数据引自Sun and McDonough(1989)

Fig. 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spidergrams (b) for the Xi'anli Hb-gabbros

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图 7 西安里角闪辉长岩的Y-Sr/Y变异图解(Defant and Kepezhinskas, 2001)

Fig. 7. Y vs. Sr/Y diagram for the Xi'anli Hb-gabbros

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图 8 西安里角闪辉长岩中锆石Hf同位素特征(富集地幔EMⅠ区引自Yang et al., 2006；Chen et al., 2008)

Fig. 8. Zircon Hf isotopic features for the Hb-gabbro from the Xi'anli intrusion

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表 1 西安里角闪辉长岩中锆石LA-ICP-MS U-Pb定年结果

Table 1. LA-ICP-MS zircon U-Pb dating data from the Xi'anli Hb-gabbro

点号	元素含量		Th/U	同位素比值								年龄(Ma)
	Th(10^-6)	U(10^-6)		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th
	Th(10^-6)	U(10^-6)		比值	1σ	比值	1σ	比值	1σ	比值	1σ	年龄	1σ	年龄	1σ	年龄	1σ	年龄	1σ
XA2-11	1 111	525	2.12	0.049 9	0.001 5	0.144 8	0.004 5	0.021 1	0.000 2	0.006 6	0.000 1	190	55	137	4	134	1	133	2
XA2-12	423	263	1.61	0.051 5	0.002 1	0.147 9	0.006 1	0.021 0	0.000 2	0.006 6	0.000 1	265	74	140	5	134	1	133	2
XA2-13	1 446	547	2.64	0.048 9	0.001 3	0.136 5	0.003 6	0.020 3	0.000 2	0.006 6	0.000 1	140	47	130	3	129	1	132	2
XA2-14	979	497	1.97	0.049 0	0.001 6	0.134 8	0.004 5	0.020 0	0.000 2	0.006 4	0.000 1	149	62	128	4	127	1	128	2
XA2-15	590	298	1.98	0.052 0	0.002 1	0.148 4	0.006 0	0.020 8	0.000 2	0.006 7	0.000 2	283	71	141	5	133	2	135	3
XA2-16	1 694	708	2.39	0.048 5	0.001 4	0.132 2	0.003 7	0.019 9	0.000 2	0.006 5	0.000 1	122	51	126	3	127	1	130	2
XA2-17	578	296	1.95	0.051 7	0.001 9	0.149 3	0.005 7	0.020 9	0.000 2	0.006 6	0.000 1	270	72	141	5	133	1	134	2
XA2-18	920	640	1.44	0.049 7	0.001 4	0.140 3	0.003 8	0.020 4	0.000 2	0.006 7	0.000 1	181	48	133	3	130	1	136	2
XA2-19	1 569	604	2.60	0.049 9	0.001 5	0.143 4	0.004 1	0.020 8	0.000 2	0.006 7	0.000 1	191	52	136	4	133	1	135	2
XA2-110	771	463	1.67	0.050 7	0.001 7	0.145 2	0.004 9	0.020 7	0.000 2	0.006 5	0.000 1	226	64	138	4	132	1	131	2
XA2-111	1 302	581	2.24	0.048 8	0.001 6	0.137 8	0.004 3	0.020 4	0.000 2	0.006 5	0.000 1	139	58	131	4	130	1	131	2
XA2-112	1 752	615	2.85	0.049 1	0.001 4	0.137 9	0.003 7	0.020 4	0.000 2	0.006 4	0.000 1	154	47	131	3	130	1	130	2
XA2-113	1 684	638	2.64	0.053 9	0.001 4	0.158 2	0.004 1	0.021 2	0.000 2	0.006 8	0.000 1	365	46	149	4	135	1	137	2
XA2-114	1 536	554	2.77	0.049 2	0.001 4	0.138 5	0.003 8	0.020 4	0.000 2	0.006 4	0.000 1	156	50	132	3	130	1	129	2
XA2-115	1 644	692	2.38	0.050 2	0.001 3	0.142 9	0.003 6	0.020 6	0.000 2	0.006 5	0.000 1	206	45	136	3	131	1	130	2

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表 2 西安里角闪辉长岩中锆石LA-ICP-MS Hf同位素分析结果

Table 2. LA-ICP-MS zircon Hf isotopic data from the Xi'anli Hb-gabbro

分析点号	同位素比值						Hf同位素成分			模式年龄(Ma)		f_Lu/Hf
分析点号	¹⁷⁶Yb/¹⁷⁷Hf	2σ_m	¹⁷⁶Lu/¹⁷⁷Hf	2σ_m	¹⁷⁶Hf/¹⁷⁷Hf	2σ_m	ε_Hf(0)	ε_Hf(t)	2σ_m	T_DM1	T_DM2	f_Lu/Hf
XA2-1-01	0.102 588	0.004 106	0.003 755	0.000 149	0.282 081	0.000 027	-24.4	-21.9	1.0	1 778	3 579	-0.89
XA2-1-02	0.078 659	0.000 610	0.003 154	0.000 020	0.282 110	0.000 027	-23.4	-20.8	1.0	1 706	3 485	-0.90
XA2-1-03	0.098 703	0.000 289	0.003 659	0.000 018	0.282 063	0.000 019	-25.1	-22.5	0.7	1 799	3 634	-0.89
XA2-1-04	0.099 214	0.002 014	0.003 633	0.000 078	0.282 131	0.000 023	-22.7	-20.1	0.8	1 697	3 420	-0.89
XA2-1-05	0.096 487	0.003 006	0.003 560	0.000 112	0.282 096	0.000 028	-23.9	-21.4	1.0	1 746	3 531	-0.89
XA2-1-06	0.103 679	0.001 998	0.003 710	0.000 073	0.282 075	0.000 028	-24.6	-22.1	1.0	1 784	3 597	-0.89
XA2-1-07	0.155 761	0.002 831	0.005 558	0.000 101	0.282 054	0.000 026	-25.4	-23.0	0.9	1 916	3 675	-0.83
XA2-1-08	0.095 313	0.001 018	0.003 580	0.000 036	0.282 146	0.000 025	-22.1	-19.6	0.9	1 672	3 374	-0.89
XA2-1-09	0.112 446	0.000 442	0.003 970	0.000 016	0.282 098	0.000 023	-23.9	-21.3	0.8	1 764	3 528	-0.88
XA2-1-10	0.081 798	0.000 833	0.002 907	0.000 034	0.282 118	0.000 021	-23.1	-20.5	0.8	1 681	3 456	-0.91
XA2-1-11	0.110 841	0.000 298	0.004 015	0.000 021	0.282 038	0.000 021	-26.0	-23.5	0.8	1 856	3 716	-0.88
XA2-1-12	0.089 185	0.000 530	0.003 356	0.000 034	0.282 101	0.000 029	-23.7	-21.1	1.0	1 728	3 513	-0.90
XA2-1-13	0.113 416	0.000 126	0.004 095	0.000 012	0.282 090	0.000 029	-24.1	-21.6	1.0	1 781	3 553	-0.88
XA2-1-14	0.119 968	0.000 263	0.004 372	0.000 007	0.282 158	0.000 030	-21.7	-19.2	1.1	1 692	3 342	-0.87
XA2-1-15	0.098 330	0.000 732	0.003 593	0.000 031	0.282 116	0.000 027	-23.2	-20.6	1.0	1 717	3 468	-0.89
注：表中锆石Hf同位素组成的计算参数为：¹⁷⁶Lu衰变常数λ=1.865×10^-11(Söderlund et al., 2004)；球粒陨石和亏损地幔的¹⁷⁶Lu/¹⁷⁷Hf，¹⁷⁶Hf/¹⁷⁷Hf分别为0.033 21/0.282 772，0.038 42/0.283 25(Bizzarro et al., 2002；Griffin et al., 2000)；镁铁质下地壳的f_Lu/Hf=-0.34(Amelin et al., 2000)；计算ε_Hf(t)时，取角闪辉长岩²⁰⁶Pb/²³⁸U年龄的加权平均值t=131 Ma.

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表 3 西安里角闪辉长岩主量元素(%)、微量元素(10^-6)测试结果

Table 3. Major (%), trace-element (10^-6) data of the Xi'anli Hb-gabbros

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	总量	Mg^#	Na₂O/K₂O
XA4-1	48.74	0.57	11.79	9.21	0.15	15.14	7.06	2.78	1.28	0.24	2.93	99.88	0.77	2.18
XA4-4	48.74	0.61	11.37	9.54	0.16	15.18	7.19	2.36	1.00	0.23	3.56	99.93	0.76	2.37
XA6-18	49.11	0.49	10.98	9.21	0.15	16.38	6.60	2.34	1.06	0.20	3.53	100.03	0.78	2.22
样品编号	Li	Be	Sc	V	Cr	Co	Ni	Cu	Zn	Ga	Rb	Sr	Y	Zr
XA4-1	10.19	0.78	20.2	173	976	54.6	645	52.5	98.5	15.4	25.9	659	15.1	60.1
XA4-4	9.37	0.70	20.3	169	939	54.9	635	44.4	99.1	14.5	18.2	667	15.8	54.0
XA6-18	9.08	0.69	19.2	145	1050	58.2	718	42.1	85.5	13.8	21.4	646	13.7	61.5
样品编号	Nb	Mo	Cs	Ba	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
XA4-1	3.39	0.34	0.80	575	15.9	36.2	4.82	21.1	4.24	1.33	3.63	0.50	2.77	0.52
XA4-4	3.14	0.57	0.73	433	14.8	33.1	4.50	20.2	4.18	1.32	3.69	0.51	2.89	0.53
XA6-18	3.00	0.51	0.81	504	15.3	33.5	4.35	18.7	3.70	1.13	3.11	0.43	2.43	0.46
样品编号	Er	Tm	Yb	Lu	Hf	Ta	Pb	Th	U	Sr/Y	(La/Yb)_N	δEu		ΣREE
XA4-1	1.48	0.22	1.35	0.20	1.78	0.17	6.01	1.26	0.34	43.55	7.92	0.99		94.29
XA4-4	1.51	0.21	1.29	0.20	1.65	0.16	5.20	1.15	0.31	42.29	7.70	0.99		88.83
XA6-18	1.35	0.19	1.18	0.18	1.78	0.16	5.40	1.25	0.35	47.12	8.79	0.98		86.05

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