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地质学报  2003 

苏鲁地体超高压和退变质时代的厘定:来自片麻岩锆石微区SHRIMPU-Pb定年的证据

, PP. 229-237

Keywords: SHRIMP,U-Pb定年,锆石,矿物包体,超高压变质,片麻岩,苏鲁地体

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Abstract:

锆石微区矿物包体的激光拉曼和阴极发光测试以及相应的SHRIMPU-Pb定年结果表明,苏鲁地体片麻岩锆石微区记录了十分复杂的年代学信息。其中副片麻岩锆石核部记录了345~743Ma的继承性锆石年龄,标志着原岩碎屑锆石来源的复杂性;含柯石英的锆石微区记录了220~234Ma的超高压变质年龄;而含石英包体的边部则记录了202~219Ma的退变质年龄。正片麻岩继承性锆石核部所记录的年龄为574~680Ma,表明原岩锆石曾经历了部分Pb丢失,原岩的形成年龄应大于680Ma;含柯石英锆石微区所记录的超高压变质年龄为224~242Ma;而锆石边部所记录的退变质年龄为209~219Ma。两类片麻岩锆石微区所隐藏的超高压变质和退变质年龄信息十分相近,平均值分别为229±4Ma和211±4Ma,标志着苏鲁地体超高压变质时代应为印支期,相应的构造抬升速率约5.6km/Ma。该项成果不仅确定了苏鲁地体超高压变质和退变质时代,而且对于深入探讨苏鲁地体快速折返过程中的动力学机制有着重要的科学意义。

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