青海南山构造带印支早期基性杂岩体年代学、地球化学特征及地质意义

张永明; 裴先治; 李佐臣; 李瑞保; 刘成军; 裴磊; 陈有炘; 王盟

doi:10.3799/dqkx.2018.537

青海南山构造带印支早期基性杂岩体年代学、地球化学特征及地质意义

doi: 10.3799/dqkx.2018.537

1.
西部矿产资源与地质工程教育部重点实验室, 自然资源部岩浆作用成矿与找矿重点实验室, 长安大学地球科学与资源学院, 陕西西安 710054
2.
山东理工大学资源与环境工程学院, 山东淄博 255049

基金项目:

山东省财政资金项目 2017CXGC1604

国家自然科学基金项目 41472191

中央高校基本科研业务费专项资金项目 2013G1271092

中国地质调查局地质调查项目 12120114018219

国家自然科学基金项目 41502191

中国地质调查局地质调查项目 12120114041201

中央高校基本科研业务费专项资金项目 CHD2011TD020

中央高校基本科研业务费专项资金项目 2013G1271091

国家自然科学基金项目 41172186

详细信息

作者简介:
张永明(1971-), 男, 讲师, 博士研究生, 主要从事造山带构造岩浆作用研究

通讯作者:
裴先治

中图分类号: P595;P597
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出版历程
- 收稿日期: 2018-02-09
- 刊出日期: 2019-07-15

Zircon U-Pb Geochronogy, Geochemistry and Its Geological Implication of the Early Indosinian Basic Complex in the Qinghai Nanshan Tectonic Belt

1.
Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MNR, School of Earth Science and Resources, Chang'an University, Xi'an, 710054, China
2.
Faculty of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China

摘要

摘要: 青海南山构造带是衔接宗务隆构造带、南祁连构造带和西秦岭造山带的重要结合带.该地区印支早期岩浆作用强烈，虽然该期基性岩分布少而分散，但其成因研究对探讨青海南山构造带印支期演化过程具有重要意义.本文对构造带中段由辉长岩和辉石岩组成的拉日基性杂岩体开展了详细的岩石学、矿物学、岩石地球化学及LA-ICP-MS锆石U-Pb同位素年代学研究.结果表明，辉长岩和辉石岩的结晶年龄分别为247.7±2.8 Ma和247.9±2.5 Ma，说明岩体侵位于早三叠世晚期.岩石具有低Si、富Na、低K和高Mg、Fe的特征；其中，辉长岩属拉斑玄武岩系列，同时，高Al₂O₃/TiO₂比值和低TiO₂含量与玻安岩和玻玄岩相似.岩石的地球化学特征与洋脊和板内玄武岩差异明显，其富集LREE和大离子亲石元素LILEs（Cs、Rb、K、Sr），亏损Nb、Ta、Zr、Hf、Ti、P等高场强元素，显示与岛弧岩浆岩相似的地球化学特征.矿物电子探针分析表明，斜长石为类似于岛弧或活动大陆边缘辉长岩中的高钙斜长石.辉长岩和辉石岩均为尖晶石二辉橄榄岩部分熔融的产物.综合分析表明，研究区可能存在晚古生代−早中生代有限小洋盆，拉日基性杂岩体形成于洋盆俯冲早期阶段.
- 基性杂岩 /
- 锆石U-Pb定年 /
- 地球化学 /
- 早三叠世晚期 /
- 青海南山
Abstract: The Qinghai Nanshan tectonic belt, situated in the northern margin of Gonghe basin, is the conjunction area among the West Qinling orogenic belt, South Qilian tectonic belt and Zongwulong tectonic belt. A large quantity of intrusive rocks outcropped in the Qinghai Nanshan tectonic belt, but the distribution of basic rocks is less and dispersed. The petrogenesis of basic rocks is significant to reveal the tectonic framework and evolution history in that period.The Lari basic complex is composed of gabbro and pyroxenite, which situates in the middle of the Qinghai Nanshan tectonic belt. In this paper, a detailed study on petrology, mineralogy, geochemistry and LA-ICP-MS zircon U-Pb dating was carried out for the Lari basic complex. The results show that the crystallization ages of the gabbro and pyroxenite are 247.7±2.8 Ma and 247.9±2.5 Ma, respectively, suggesting that the complex intruded in the late Early Triassic. The whole rock geochemical data show that the rocks of Lari basic complex are relatively rich in Na, Mg and Fe, but poor in Si and K, suggesting that the gabbros belong to the tholeiitic series. What's more, they have high ratios of Al₂O₃/TiO₂, low contents of TiO₂, which are typical features of boninite and boni-basalts. The rocks are enriched in LREE, LILEs (Cs, Rb, K, Sr) and depleted in HREE (Nb, Ta, Zr, Hf, Ti, P), which are similar to the arc magma, but different from ridge and intraplate basalt. The mineral electron microprobe analysis shows that plagioclase in the rocks of Lari basic complax is similar to the high calcium plagioclase in gabbro which originates in the island arc or active continental margin. The gabbro and pyroxenite of the Lari basic complex were formed by partial melting of the spinel lherzolite. In combination with analyses of regional geological setting, we suggest that there existed a Late Paleozoic-Early Mesozoic limited oceanic basin in the Qinghai Nanshan area. The Lari basic complex formed during the early stage of the oceanic basin subduction.
- basic complex /
- zircon U-Pb dating /
- geochemistry /
- late Early Triassic /
- Qinghai Nanshan

HTML全文

图 1 青海南山地区拉日基性杂岩体构造位置（a、b）及岩体地质简图（c）

图a据常宏等（2009）修改

Fig. 1. The tectonic setting (a, b) and geological sketch map (c) of the Lari basic complex in the Qinghai Nanshan area

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图 2 拉日基性杂岩体岩石野外及镜下特征

a.辉长岩手标本；b.辉石岩露头；c.辉长岩显微照片；d，f.辉石岩显微照片；e.辉长岩与辉石岩接触界线.Ol.橄榄石；Cpx.单斜辉石；Opx.斜方辉石；Pl.斜长石

Fig. 2. Macroscopic and microcosmic characteristics of the Lari basic complex

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图 3 拉日基性杂岩体辉长岩（LR101/2-2）和辉石岩（LR101/11-3）锆石CL图像及²⁰⁶Pb/²³⁸U表面年龄

Fig. 3. CL images and apparent ages of representative zircons of gabbro and pyroxenite in the Lari basic complex

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图 4 拉日基性杂岩体辉长岩（LR101/2-2）和辉石岩（LR101/11-3）锆石U-Pb年龄谐和图（a）和加权平均年龄（b）

Fig. 4. LA-ICP-MS zircon U-Pb concordia diagram (a) and weighted average ages diagram (b) for zircon samples of gabbro (LR101/2-2) and pyroxenite (LR101/11-3) in the Lari basic complex

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图 5 拉日基性杂岩体岩石分类的TAS（a）和Zr-Y图（b）

图a据Middlemost (1994)；图b据Barrett and MacLean (1994)；Th.拉斑系列；Ch.钙碱性系列

Fig. 5. TAS diagram (a) and Zr-Y diagram (b) for the Lari basic complex

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图 6 拉日基性杂岩体岩石主要氧化物及微量元素哈克图解

Fig. 6. Harker plots of selected major and trace elements for the Lari basic complex

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图 7 拉日基性杂岩体球粒陨石标准化稀土配分曲线（a）及微量元素原始地幔标准化蛛网图（b）

球粒陨石标准化数据引自Boynton(1984)；原始地幔标准化数据、OIB/E-MORB/N-MORB数据引自Sun and McDonough(1989)

Fig. 7. Chondrite-normalized REE patterns (a) and primitive-mantle normalized trace element spider diagrams (b) for the Lari basic complex

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图 8 拉日基性杂岩体岩石源区判别图解

a.据Aldanmaz et al.(2000)；b.据Furman et al. (2004)；c.据Condie et al. (2002)；DEP.亏损地幔；EN.富集地幔；N-MORB.普通洋中脊玄武岩；PM.原始地幔；REC.再循环板片；UC.上地壳

Fig. 8. Source characteristics of the Lari basic complex

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图 9 拉日基性杂岩体Ba/La-Th/Yb图解和Th-U/Th图解

a.据Woodhead et al.(2001)；b.据Dilek et al.(2008)

Fig. 9. Ba/La-Th/Yb and Th-U/Th diagrams of the Lari basic complex

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图 10 拉日基性杂岩体岩浆同化混染判别图解

Fig. 10. Discrimination plots for contamination of the Lari basic complex

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图 11 拉日基性杂岩体La-La/Sm图解和Nb/Y-Th/Y图解

图a据Keppler(1996)；图b据Taylor and McLennan(1985)

Fig. 11. La-La/Sm and Nb/Y-Th/Y diagrams of the Lari basic complex

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图 12 拉日基性杂岩体构造环境判别图解

图a、b据李曙光(1993)；图c据Shervais(1982)；图d据Pearce and Peate(1995)；MORB.洋中脊玄武岩；E-MORB.富集型MORB；N-MORB.亏损型MORB；IAB岛弧玄武岩；IAT.岛弧拉斑玄武岩；OIB.洋岛玄武岩；BAB.弧后盆地；CFB.大陆溢流玄武岩；Bon.玻安岩；CAB.钙碱性玄武岩

Fig. 12. Tectonic discrimination diagrams of the Lari basic complex

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