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大别山东部榴辉岩同位素体系和变质作用的关系

引用本文：简平.1999.大别山东部榴辉岩同位素体系和变质作用的关系[J].地球学报,20(4):341-348.

DOI：

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作者	单位
简平	中国地质科学院地质研究所,北京

基金项目:国土资源部同位素地质研究开放实验室基金

中文摘要:大别山东部榴辉岩同位素地这研究反映出三方面的问题：（1）Sm-Nd两点等时线的不确定性；（2）部分高压－超高压变质年龄实际是片麻岩的分析结果：（3）首批发表的“C型榴辉岩”Sm-Nd年龄，测定岩石不是榴辉岩。大别山东部榴辉石年龄反映的是加里东期高压－超高压变质的年代学信息。进一步研究应着重于榴辉锆石成因及Sm-Nd体系适用性。岩相学是研究榴辉岩锆石成因的重要方法。

中文关键词:榴辉岩同位素体系和变质作用的关系大别山东部

The Relationship between Isotopic Systems and Metamorphism of the Eclogites from the Eastern Dabie Mountains

Abstract:Three main problems are revealed from the geochronological data of eclogites in the eastern Dabie Mountains.(1)It is difficult to evaluate the geological significance of Sm-Nd internal isochrons because of their two-point nature.(2)Some data of gneiss are interpreted as high-to ultrahigh-pressure metamorphic ages;(3)The first batch of Sm-Nd ages of “C type eclogites”was actually dated on garnet pyroxenites.Which three misleaded the geochronological studies of eclogites in the area.;The ages on eclogites reflect the Caledonian high-to ultrahigh metamorphic event of the eastern Dabie monuntains.The further geochronological study should focus on origins of zircons and the behavious of Sm-Nd system of eclogites.Petrographical observation provides and important method in studying the origions of zircons from eclogites.

keywords:eastern Dabie mountains eclogites the relationship between isotopic systems and metamorphism

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