小秦岭高压榴闪岩的发现及其构造意义

在小秦岭变质核杂岩主体早前寒武纪太华群中，发现了溜闪岩包体。对其岩石学，岩相学的初步研究及主要矿物石榴石和角闪石的电子探针分析表明，所发现的榴闪岩包体属高压变质榴辉岩的综合对比分析，认为榴闪岩是在印支期陆内Ａ型俯冲造山过程中形成的。

DISCOVERY OF ECL0GITE IN XIAO QINLING,SHAN XI PROVINCE AND ITS TECTONIC SIGNIFICANCE

The ecoligte enclave was found for the first time in the group of the Neo-Arehean to Paleo-Proterozoic Taihua Group in Xiao Qinling, A detailed study has been conducted to investigate its outcropping characteristics, texture, structure and facieology. The EMP analysis demonstrated that the garnet composition is of 60～ 64％ Alm, 10～ l4％ Pyr and 18～ 19.5％ Spe．The percentage of the pyrope suggests that the eclogite in the Taihua Group is high-pressure metamorphic treks. The garnet enclaved in the amphibole has the highest pyrope content, which could reach up to 14％ and is similar to garnet in the eclogite in Dabieshan Mountain．The amphibole chemical composition is compatible with the amphibole compositions from granulite in the Taihna Group and appears to be high-pressure-type amphibole．Based on comparison of characteristics of the eclogite in North China craton, we discussed the forming environment and tectonic significance of the eclogite in Xiao Qinling.