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- W4313175028 abstract "佳木斯-兴凯地块是吉黑东部地区至关重要的地质组成单元,其东缘和西缘分别平行对称分布着两条晚古生代岛弧岩浆岩带和中生代增生杂岩带,它们是古亚洲洋闭合向古太平洋俯冲-增生构造体制转换的关键地质记录。本文对佳木斯-兴凯地块西缘吉黑高压带中的青龙村群斜长角闪岩进行了系统的岩石学、锆石年代学和全岩地球化学研究,结果表明青龙村斜长角闪岩原岩为拉斑系列玄武岩,其原岩时代为~260Ma,具有富集型洋中脊玄武岩(E-MORB)的地球化学特征。同时结合前人对佳木斯地块东缘和西缘分布的大量晚古生代岛弧岩浆岩以及增生杂岩的研究,本文识别出佳木斯-兴凯地块东、西缘的双带双弧结构。双带即东缘和西缘平行对称分布的那丹哈达增生杂岩带和吉黑高压变质带,双弧则是东缘和西缘同样平行对称分布的早-中二叠世和中-晚二叠世岛弧岩浆岩带。通过对双带双弧的组成、形成时代以及构造背景的研究,进一步为吉黑东部地区晚古生代时期的古大洋构造体制转换提供新的证据,并重建了中亚造山带东缘晚古生代到早中生代的构造演化历史。" @default.
- W4313175028 created "2023-01-06" @default.
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- W4313175028 date "2022-01-01" @default.
- W4313175028 modified "2023-10-14" @default.
- W4313175028 title "The transition of the Late Paleozoic tectonic regime in eastern Jilin and Heilongjiang provinces: Constraints from the double accretionary complex and island arc magmatic rock belts in the Jiamusi-Khanka Block" @default.
- W4313175028 doi "https://doi.org/10.18654/1000-0569/2022.09.14" @default.
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