本文選題：中性脈巖 + 鋯石U-Pb定年��； 參考：《地球科學》2017年06期

【摘要】：為了研究西昆侖造山帶東段古特提斯構(gòu)造-巖漿演化,提升區(qū)域研究程度,對宿營地脈巖進行系統(tǒng)的野外地質(zhì)調(diào)查、巖相學、LA-ICP-MS鋯石U-Pb定年、巖石地球化學研究.脈巖呈NE向成群成帶分布;巖石類型為(含石榴)閃長玢巖、角閃安山玢巖及閃斜煌斑巖;獲得(含石榴)閃長玢巖LA-ICP-MS鋯石U-Pb加權(quán)平均年齡(214±1)~(219±1)Ma,形成于晚三疊世,是印支晚期構(gòu)造-巖漿活動產(chǎn)物;脈巖主要為鈣堿性系列巖石,表現(xiàn)出中Si(SiO_2=53.92%~62.95%)、高Al(Al_2O_3=15.99%~17.69%)、富Na(Na_2O=2.63%~6.09%、Na_2O/K_2O=1.09~8.30)、低Ti(Ti_2O=0.50%~0.76%)、低P(P_2O_5=0.14%~0.23%)、Mg(Mg~#=37.73~59.32)變化大等主量元素特征,鋁飽和指數(shù)(A/CNK)為0.92~1.36;脈巖富集LREE、Rb、Th、U、K,虧損HREE、Nb、Ta、P、Ti,(La/Yb)N=7.24~20.02,Ce、Eu異常不明顯.結(jié)果表明,宿營地中性脈巖是西昆侖東段南緣晚三疊世古特提斯弧后拉張作用引起的殼-�；旌献饔玫漠a(chǎn)物.
[Abstract]:In order to study the evolution of Paleotectonic-magma in the eastern part of the West Kunlun orogenic belt and to enhance the regional study degree, systematic field geological survey of the Suzhang dike rocks, U-Pb dating of zircon from the lithofacies and geochemistry of the rocks were carried out. The dike rocks are distributed in NE direction in groups of diorite porphyrite, hornblende porphyrite and diorite lamprophyre, and the LA-ICP-MS zircon U-Pb weighted mean age of diorite porphyrite (including pomegranate) is obtained, which was formed in the late Triassic. 鏄嵃鏀櫄鏈熸瀯閫，

本文編號：1786305