高校地质学报Issue(3)：519-528,10.DOI:10.16108/j.issn1006-7493.2015035
内蒙古固阳地区早石炭世花岗岩的发现：来自SHRIMP锆石U-Pb年代学的证据
Discovery of the Early Carboniferous Granite in Guyang, Inner Mongolia:Evidence from Zircon SHRIMP U-Pb Dating
摘要
Abstract
Guyang area is located in the northern margin of the North China Craton, and Neopaleozoic granites are widespread there. In these granitic intrusions, granodiorite occurs as late intrusive veins, and diorite enclaves can be found in the granodioritic veins. For these three kinds of rocks, major and trace elements are measured to constrain their geochemical characteristics, while zircons are measured by SHRIMP to provide U-Pb ages. All these samples are calc-alkaline series, and enriched in LILE and LREEs, and show a mild fractionated REE. On a primitive-mantle normalized spidergram, these rocks show distinctly negative Nb, Ta, Ti anomalies and positive Rb, Th, K anomalies. U-Pb dating of zircon yielded crystallization ages of 330.8Ma, 324.7Ma, and 329.2Ma for the granite, the granodiorite and the diorite, respectively, which belong to the early carboniferous.The early Carboniferous magmatic rocks in northern margin of North China Craton should be associated to the subducting of Paleo-Asian Ocean to the North China plate, since this occurred before the convergence of the Siberia Craton and the North China Craton. Granites should be generated from remelting of continental crust, and granodiorite probably produced by mixing granitic magma and dioritic magma.关键词
固阳北部/SHRIMP锆石U-Pb年龄/早石炭世/岩浆混合Key words
North Guyang/SHRIMP Zircon U-Pb dating/Early Carboniferous/magma mixing分类
天文与地球科学引用本文复制引用
刘超,孙蓓蕾,吴婧,曾凡桂..内蒙古固阳地区早石炭世花岗岩的发现：来自SHRIMP锆石U-Pb年代学的证据[J].高校地质学报,2015,(3):519-528,10.基金项目
国家自然科学基金（41372165）资助 （）
