地质通报2017，Vol.36Issue(10)：1783-1799,17.
西藏扎布耶茶卡北部早白垩世侵入岩锆石U-Pb年龄、地球化学特征及其地质意义
Zircon U-Pb ages and geochemistry of the Early Creta-ceous intrusive rocks in the north of Zabuye salt lake area, Tibet,and their geological significance
摘要
Abstract
The genetic model of the widely distributed magmatism in the Mid-Gangdise belt of Tibet during Early Cretaceous is still controversial. The authors conducted field observation, zircon U-Pb dating and geochemical studies of the intrusions from Zabuye salt lake in the Mid-Gangdise belt. Zircon U-Pb age dating suggests that the the intrusion of Zabuye salt lake magma occurred in two periods (142Ma and 100Ma), and both have intermediate to acidic plutons and gabbro dikes. The first phase plutons are I-type metaluminous and high-k calc-alkaline series granitic rocks, whereas the second phase plutons belong to metaluminous high-k calc-alkaline series dioritic intrusions. Both intermediate to acidic plutons show enrichment of LILE (Rb, Ba, Th and U) and depletion of HFSE (Nb, Ta), with strong magma mixing characters.The data collected from previous researchers show that the first phase granitic plutons and gabbro dike were induced by the roll-back of the subducted Bangong-Nujiang Oceanic slab, while the second phase plutons and dike resulted from the oceanic slab break-off. The results obtained by the authors provide evidence for the southern di-rection subduction, roll-back and break-off of the Bangong-Nujiang Oceanic slab.关键词
中冈底斯带/LA-ICP-MS锆石U-Pb年龄/全岩地球化学/班公湖-怒江洋演化Key words
Mid-Gangdise belt/LA-ICP-MS zircon U-Pb age/whole rock geochemistry/Bangong-Nujiang Ocean evolution分类
天文与地球科学引用本文复制引用
侯云岭,黄柏鑫,贾小川,杨学俊,叶春林,吕志伟,杨蕻..西藏扎布耶茶卡北部早白垩世侵入岩锆石U-Pb年龄、地球化学特征及其地质意义[J].地质通报,2017,36(10):1783-1799,17.基金项目
中国地质调查局项目《冈底斯-喜马拉雅铜矿资源基地调查》(编号:DD20160015)和《西藏扎布耶茶卡北地区1:5万H45E002001、H45E002002、H45E003001、H45E003002四幅区域地质矿产调查》(编号:121201010000150014-13) （编号:DD20160015）
