东昆仑东端扎那合惹地区元古宙蛇绿岩

扎那合惹地区元古宙蛇绿岩由超镁铁质堆晶岩组成，堆晶岩岩石化学成分、矿物组成变化较大。痕量元素、稀土元素表现出富集不相容元素的特征，而Nd同位素地球化学特征显示其源于亏损的地幔源区。超镁铁质堆晶岩Sm-Nd等时线年龄为1480±3Ma，与之紧密伴生的榴闪岩40Ar／39Ar坪年龄为（881.8±4.7）Ma（石榴石）和（852.2±1.0）Ma（角闪石），分别代表了古昆中洋扩张及俯冲消减的时限。

Proterozoic ophiolite in the Zhanahere area in the east section of the East Kunlun

Proterozoic ophiolite in the Zhanahere area， East Kunlun， consists mainly of ultramafic cumulate rocks． The petrochemical and mineral compositions of the cumulate rocks exhibit a wide variation range． Trace elements and rare earth elements show enrichment in incompatible elements， and Nd isotope geochemistry shows that it originated from the depleted mantle source region． Ultramafic cumulate rock has a Sm-Nd isochron age of 1480±3 Ma， and the garnet amphibolite closely related to it has an 40Ar-39Ar plateau ages of 881．8±4．7 Ma （garnet） and 852．2±1．0 Ma （amphibole）， which respectively represent the timing of spreading and subduction Central Kunlun paleo-ocean limit．