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地质论评  2012 

北淮阳浅变质岩带卢镇关群变质压力及其对大别造山带演化的指示

Keywords: 大别造山带,卢镇关群,变质压力,造山带演化

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Abstract:

卢镇关群是北淮阳浅变质岩带的重要组成部分,其俯冲历史对于证明超高压岩石经历了深俯冲及获得完整的大别造山带演化历史具有重要意义。本次工作在霍山牛角冲、与儿街卢镇关群岩石中采集了含石榴子石的黑云二长片麻岩和石榴黑云片麻岩进行电子探针分析,并通过石榴子石―黑云母―斜长石―石英压力计计算获得了卢镇关群的变质压力变化于1?89~1?99GPa,其平均值为1?94GPa。根据造山带内中―上地壳岩石的平均密度,获得了卢镇关群曾俯冲于地下64?7km的深度。这表明位于大别造山带最北缘的北淮阳带曾俯冲于较大深度,支持前人关于华南、华北板块缝合线位于北淮阳带以北的结论。

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