柴北缘沙柳河榴辉岩岩石化学及变质条件研究  

Research into petrochemistry and metamorphic condition of eclogites on Shaliuhe, the north margin of the Qaidam Basin

作　　者：王新宇[1] 李盛富[1] 鄢全树[1] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地球科学与环境学报》2005年第1期14-18,共5页Journal of Earth Sciences and Environment

基　　金：中国地质调查局地质调查项目(200113000062)

摘　　要：　柴达木盆地北缘东端沙柳河一带榴辉岩呈布丁构造赋存在新元古代末期花岗质片麻岩中,榴辉岩主要由石榴子石、绿辉石和金红石等矿物组成。通过对该地榴辉岩的岩石化学和变质条件研究,发现其峰期变质条件为492.12 ℃~653.48 ℃和1.008~1.625 GPa,未达到超高压的环境,在岩石中也未发现明显的超高压证据,与柴达木盆地北缘其他地区(鱼卡河、锡铁山、野马滩)榴辉岩有所区别。The eclogite was found in the Neoproterozoic granitic gneiss in Shaliuhe, the north margin of the Qaidam Basin. It occurs in shape of lens or boundins, and mainly composed of garnet, omphacite and rutile etc. Based on the reseach into petrochemistry and metamorphic condition of the eclogites here, we found its peak metamorphic conditions is 492.12 ℃^(653.48 ℃) and 1.008~1.625 GPa , not achieve the UHP environment, and no evident UHP evidence was found in eclogites here, it is distinct from the other eclogite outcrop places(Yuqiahe, Xitieshan, Yematan)in the north Qaidam Basin.

关 键 词：榴辉岩 岩石化学 柴北缘 柴达木盆地北缘 绿辉石 布丁构造 花岗质片麻岩 变质 超高压 

分 类 号：P588[天文地球—岩石学] P542[天文地球—地质学]