地质通报2017，Vol.36Issue(7)：1204-1217,14.
渤海海域庙西北凸起中生代花岗岩LA-ICP-MS锆石U-Pb测年及其地质意义
LA-ICP-MS zircon U-Pb dating of Mesozoic granite in Miaoxibei uplift, Bohai Sea area, and its geological significance
摘要
Abstract
For the purpose of better understanding of the formation, evolution and tectonic environment of the first unmetamor?phosed granite oil pool in Bohai Sea area, the authors carried out a study of granite buried hill of Miaoxibei uplift. Based on petrogra?phy, LA-ICP-MS zircon U-Pb ages and whole-rock major and trace elements, the authors investigated the petrogenesis, magma source and tectonic setting. LA-ICP-MS zircon U-Pb data of the granite yielded weighted age of 155.4 ± 2.5Ma, the granite is of cale-alkaline suite with positive Eu anomaly, both samples have the characteristics of depletion of heavy rare earth elements and en?richment of light rare earth elements, and the granite is strongly enriched in large ion lithophile elements (LILEs, e.g., Pb, Sr) but de?pleted in high field strength elements (HFSEs, e.g. Th, Nb, Zr). It is thus held that the crust experienced shortening and thickening rapidly because of the pressure of Yangtze plate and the Jiamusi Mongolia block during the early Middle Jurassic, and that, due to the rising temperature, the lower crust was subjected to partial melting, which eventually surged and invaded, resulting in the formation of peraluminous S-type granite in the Miaoxibei uplift buried hill.关键词
庙西北凸起/花岗岩/潜山/LA-ICP-MS锆石U-Pb测年/燕山期/地球化学Key words
Miaoxibei uplift/granite/buried hill/LA-ICP-MS zircon U-Pb dating/Yenshanian/geochemistry分类
天文与地球科学引用本文复制引用
赵国祥,王清斌,杨波,王飞龙,刘丰..渤海海域庙西北凸起中生代花岗岩LA-ICP-MS锆石U-Pb测年及其地质意义[J].地质通报,2017,36(7):1204-1217,14.基金项目
国家科技重大专项《近海隐蔽油气藏勘探技术》(编号:2011ZX05023-006-002)和中国海洋石油总公司勘探部生产科研项目《蓬莱9-1构造潜山储层特征及成因机理研究》(编号:2012-0047532) （编号:2011ZX05023-006-002）
