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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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太湖西缘击变角砾岩的岩相学特征及其研究意义----太湖冲击成因又添新证据
DOI: 10.13232/j.cnki.j nju.2015.01.013, PP. 87-98
Keywords: 击变岩,冲击变质作用,击变角砾岩,太湖冲击事件
Abstract:
冲击变质作用是变质作用的一种新类型，是指由陨石或彗星高速降落所产生的高压冲击波，瞬间经过或穿过靶岩所引起的岩石中的所有变化，击变岩是冲击变质作用的典型产物。近年来国外在这一领域发展很快，但国内尚无详细的研究成果报道。近期我们在太湖西缘发现了这类击变角砾岩。根据国外研究总结提出的诊断性特征和有效的岩相学研究方法，本文对击变角砾岩中面型微裂隙（pfs）、面型微页理（pdfs）、击变矿物玻璃（diaplecticglass）、击变高温矿物玻璃及熔体（焦石英lechatelierite）及岩石相的转变（岩石熔融）等标志性特征的研究，确证了太湖西缘这类击变岩的存在。这不仅为“太湖冲击事件”增添新的证据，而且将对国内击变岩的研究和发展起到积极的促进作用。
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