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地质学报  2006 

北苏鲁超高压变质岩锆石中的矿物包体

, PP. 1813-1826

Keywords: 锆石,矿物包体,激光拉曼,阴极发光,超高压岩石,北苏鲁

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Abstract:

北苏鲁莒南―岚山头―日照―桃行―仰口―荣成―威海一带榴辉岩的围岩经历了强烈角闪岩相退变质作用的改造,峰期超高压矿物组合已完全被后期退变矿物组合所取代。锆石微区阴极发光图像和矿物包体激光拉曼测试研究结果表明,132件不同类型岩石(包括榴辉岩、斜长角闪岩、正片麻岩、副片麻岩、大理岩、蓝晶石英岩、云母片岩和钙镁硅酸盐类变质岩等)锆石中,普遍隐藏以柯石英为代表的超高压矿物包体。此外,在南苏鲁东海及其邻区的地表露头和一系列钻孔岩心的锆石中,也普遍发现以柯石英为代表的超高压矿物包体。该项研究成果表明,在苏鲁地体由榴辉岩及其围岩的原岩所组成的陆壳岩石(约320km×20km×5km)曾发生过巨量物质深俯冲―超高压变质的壮观地质事件。

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