柴达木盆地北缘的榴辉岩呈透镜体产在中 上元古代的片麻岩中 .岩石主要由石榴石、绿辉石、多硅白云母和金红石等矿物组成 .石榴石包含 44%～ 6 2 %的铁铝榴石、1 5 %～ 33%的钙铝榴石和 1 2 %～ 30 %镁铝榴石分子 ,绿辉石则含有 40 %～ 46 %的硬玉分子 .石榴石 单斜辉石温度计算和根据硬玉分子的地质压力计的估算表明 ,榴辉岩相的变质作用发生在温度( 72 2± 1 2 3)℃和压力高达 2 2 0 0MPa的环境 The eclogite in the northern margin of the Qaidam Basin is lenticular in Mesozoic and Mesozoic gneiss, mainly composed of minerals such as garnet, omphacite, polysiliciferous and rutile, etc. The garnet contains 44% ~ 62% of almandine, 15% ~ 33% of almandine and 12% ~ 30% of almandine molecules, while omphacite contains 40% ~ 46% of jadeite. The calculations of cristobalite temperature and geotechnical pressure gauge based on jadeite indicate that metamorphism of eclogite facies occurs at temperatures (72 2 ​​± 1 2 3) ° C and pressures up to 2200 MPa