Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (1): 141-153.doi: 10.13278/j.cnki.jjuese.20200153

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

Wang Yuqing1,2, Dong Chunyan1, Bai Wenqian1, Xie Hangqiang1, Wan Yuhseng1   

  1. 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 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)

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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

CLC Number: 

  • P697
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