苏鲁榴辉岩钾长石+石英聚合体中重晶石矿物及其意义

被引：12

作者：

曾令森

刘福来

梁凤华

陈方远

机构：

[1] 中国地质科学院地质研究所

来源：

科学通报 | 2007年 / 19期

关键词：

榴辉岩; 钾长石+石英聚合体; 重晶石; 超高压变质作用;

D O I：

暂无

中图分类号：

P578.71 [];

学科分类号：

070901 ;

摘要：

在苏鲁超高压榴辉岩的绿辉石中,发育具有柯石英(?)假象的自型或半自型钾长石+石英多晶聚合体.在钾长石和石英中,发育半自型或浑圆状的重晶石.重晶石的大小普遍小于1μm,个别可达3～5μm.利用扫描电镜的能谱分析(EDS)对重晶石进行了矿物化学测试,结果表明,这些重晶石的SO3变化范围较小为33.86%～41.12%,SrO和BaO的变化较大,分别从0～34.65%和24.12%～63.55%;SrO与BaO呈近乎线性负相关关系,说明它们是重晶石(BaSO4)和天青石(SrSO4)的固溶体;它们的Sr/Ba摩尔比值高度变化,从0～2.1.榴辉岩中以包裹体形式存在的重晶石不仅表明了大陆地壳物质深俯冲作用伴随着明显的氧化作用,而且表明了有限的流体作用使它们在退变质作用过程中保存下来的主要因素.

引用

页码：2312 / 2318

页数：7

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