南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (1): 8798.
王鹤年,钱汉东,黄钟谨,施贵军
Wang Henian, Qian Handong, Huang Zhongjin, Shi Guijun
摘要: 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(diaplectic glass)、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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