鲁西七星台地区新太古代基性岩浆作用：变质辉长岩的时代和组成

马铭株; 万渝生; 颉颃强; 刘守偈; 谢士稳; 董春艳; 白文倩; 李源; 王宇晴

doi:10.3799/dqkx.2020.190

Volume 45 Issue 7

Jul. 2020

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Ma Mingzhu, Wan Yusheng, Xie Hangqiang, Liu Shoujie, Xie Shiwen, Dong Chunyan, Bai Wenqian, Li Yuan, Wang Yuqing, 2020. Neoarchean Mafic Magmatism in Qixingtai Area, West Shandong: Formation Ages and Compositions of Meta-Gabbros. Earth Science, 45(7): 2610-2628. doi: 10.3799/dqkx.2020.190

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Neoarchean Mafic Magmatism in Qixingtai Area, West Shandong: Formation Ages and Compositions of Meta-Gabbros

doi: 10.3799/dqkx.2020.190

Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2020-07-06
Publish Date: 2020-07-15

Abstract

Abstract

This study reports SHRIMP U-Pb zircon ages and element compositions of meta-gabbros and related rocks from the Qixingtai area, western Shandong. They intrude the Neoarchean supracrustal and TTG rocks. The formation ages can be divided into three groups based on SHRIMP U-Pb dating on 12 samples:2 662- > 2 711 Ma, 2 608-2 618 Ma and 2 508-2 526 Ma. The formation ages of other rock samples for element analyses are determined in terms of their spatial distribution, field features and the relationships with the samples dated. > 2.65 Ga gabbros are derived from enriched and depleted mantles, respectively.~2.6 Ga gabbro has no enrichment of the LREE relative to the HREE, but shows LILE enrichment and weakly negative Nb, Ta and P anomalies. It is considered that the gabbro is derived from depleted mantle source, probably with continental contamination.~2.6 Ga meta-pyroxenite shows enrichment of middle REE, as a result of crystallization and accumulation of clinopyroxene.~2.5 Ga meta-gabbros are variations in REE composition from slight deplation of LREE to HREE, and flat REE pattern to enrichment of of LREE to HREE.~2.5 Ga meta-gabbroic diorite has higher REE contents and is more strongly enriched in LREE and LILE and depleted in Nb and Ta compared with~2.5 Ga meta-gabbro. Combined with early study, the conclusions can be drawn as follows:(1) In the Qixingtai area, meta-gabbros and related rocks of three periods have been identified, with the~2.6 Ga rocks being the largest in distribution scale; (2) the rocks of different ages are different in geochemical composition, showing complexities of source regions and formation processes; (3) In western Shandong, continuous mafic magmatism occurred in early Neoarchean from > 2.7 Ga to 2.6 Ga, being probably related to mantle underplating; (4)~2.5 Ga mafic meta-gabbro-diorite rocks are discovered for the first time in the Qixintai area, providing a direct evidence that the heat source is from mantle for the widespread anatexis of~2.5 Ga in Belt A.
- meta-gabbro,
- SHRIMP U-Pb zircon dating,
- geochemistry,
- west Shandong,
- Neoarchean

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