鲁西莲花山地区新太古代晚期二长花岗岩中的表壳岩包体——SHRIMP锆石U-Pb定年和地球化学特征

doi:10.13278/j.cnki.jjuese.20200153

吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (1): 141-153.doi: 10.13278/j.cnki.jjuese.20200153

鲁西莲花山地区新太古代晚期二长花岗岩中的表壳岩包体——SHRIMP锆石U-Pb定年和地球化学特征

王宇晴^1,2, 董春艳¹, 白文倩¹, 颉颃强¹, 万渝生¹

1. 中国地质科学院地质研究所北京离子探针中心, 北京 100037;
2. 中国地质大学地球科学与资源学院, 北京 100083

收稿日期:2020-07-01 出版日期:2021-01-26 发布日期:2021-02-02
通讯作者: 董春艳(1976-),女,研究员,主要从事早前寒武纪地质和锆石同位素年代学方面的研究,E-mail:dongchunyan@sina.com E-mail:dongchunyan@sina.com
作者简介:王宇晴(1995-),女,硕士研究生,主要从事地球化学方面的研究,E-mail:459551600@qq.com
基金资助:
中国地质科学院地质研究所基本科研业务费项目（J2026）；中国地质调查局项目（DD20190003，D20190358，DD20190009，DD20190370）

Supracrustal Enclaves in Late Neoarchean Monzogranite in Lianhuashan Area, Western Shandong: SHRIMP U-Pb Zircon Dating and Geochemical Characteristics

Wang Yuqing^1,2, Dong Chunyan¹, Bai Wenqian¹, Xie Hangqiang¹, Wan Yuhseng¹

1. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;
2. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received:2020-07-01 Online:2021-01-26 Published:2021-02-02
Supported by:
Supported by the Fundamental Research Funds of Institute of Geology, Chinese Academy of Geological Sciences (J2026) and the Key Program of China Geological Survey (DD20190003, D20190358, DD20190009,DD20190370)

摘要/Abstract

摘要： 为了确定鲁西莲花山地区新太古代晚期二长花岗岩中的表壳岩包体的形成时代，并探讨与相邻雁翎关地区的雁翎关岩组中的新太古代早期变质火山岩系的关系。本文对表壳岩包体及相关岩石进行了锆石年代学和地球化学研究。表壳岩包体主要由变质超基性岩和斜长角闪岩组成，另含少量（黑云）角闪变粒岩和黑云变粒岩。SHRIMP锆石U-Pb定年结果显示：角闪变粒岩的岩浆锆石年龄为2 757 Ma；侵入斜长角闪岩的奥长花岗岩脉的年龄为2 593 Ma；从变质超基性岩分选出很少锆石，它们普遍遭受强烈变质重结晶，²⁰⁷Pb/²⁰⁶Pb年龄为2 657~2 397 Ma。变质超基性岩具轻稀土亏损型或平坦型稀土模式，斜长角闪岩具平坦型稀土模式，角闪变粒岩具轻稀土略富集稀土模式，虽然大离子亲石元素相对富集，但都无明显Nb、Ta亏损。表壳岩包体的岩石组合、地球化学组成特征和形成时代可与相邻雁翎关地区的雁翎关岩组中的新太古代早期变质火山岩系对比，形成于大洋环境。新太古代早期表壳岩的原有分布范围应比现在所见到的更为广泛。

关键词: 表壳岩, 新太古代早期, SHRIMP锆石U-Pb定年, 地球化学, 鲁西

Abstract: This study was carried out to analysis the SHRIMP U-Pb zircon dating and geochemistry of the supracrustal enclaves in the Late Neoarchean monzogranite in Lianhuashan area, western Shandong. The supracrustal enclaves are mainly composed of amphibolite, meta-ultramafic rock with some fine-grained (biotite) hornblende gneiss,and fine-grained biotite gneiss. SHRIMP zircon U-Pb dating indicates that the fine-grained hornblende gneiss has a magmatic zircon age of 2 757 Ma, whereas a trondhjemite dyke intruding in the supracrustal enclave has a magmatic zircon age of 2 593 Ma. Some zircon grains separated from meta-ultramafic rock show strong recrystallization and have a large ²⁰⁷Pb/²⁰⁶Pb age variation (2 657-2 397 Ma). The meta-ultramafic rock, amphibolite, and fine-grained hornblende gneiss show LREE-depletion-flat REE pattern, flat REE pattern, and LREE-enrichment REE pattern, respectively, with weak LILE enrichment and insignificant Nb-Ta depletion. Combined with the early work, it is concluded that the rock assemblage, geochemical composition,and formation age of the supracrustal enclaves in the Lianhuashan monzogranite are the same as those of the meta-volcanic series of the typical Early Neoarchean supracrustal rocks (Yanlingguan ‘Formation’) in the adjacent Yanlingguan area, which were formed in ocean environment. The Early Neoarchean supracrustal rocks should be widely distributed in western Shandong more than considered before.

Key words: supracrustal rocks, Early Neoarchean, SHRIMP zircon U-Pb dating, geochemistry, western Shandong

中图分类号:

P697

王宇晴, 董春艳, 白文倩, 颉颃强, 万渝生. 鲁西莲花山地区新太古代晚期二长花岗岩中的表壳岩包体——SHRIMP锆石U-Pb定年和地球化学特征[J]. 吉林大学学报(地球科学版), 2021, 51(1): 141-153.

Wang Yuqing, Dong Chunyan, Bai Wenqian, Xie Hangqiang, Wan Yuhseng. Supracrustal Enclaves in Late Neoarchean Monzogranite in Lianhuashan Area, Western Shandong: SHRIMP U-Pb Zircon Dating and Geochemical Characteristics[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(1): 141-153.

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鲁西莲花山地区新太古代晚期二长花岗岩中的表壳岩包体——SHRIMP锆石U-Pb定年和地球化学特征

Supracrustal Enclaves in Late Neoarchean Monzogranite in Lianhuashan Area, Western Shandong: SHRIMP U-Pb Zircon Dating and Geochemical Characteristics

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