地质调查与研究2015，Vol.38Issue(3)：171-181,191,12.
内蒙阿尔善布拉格一带早二叠世碱性花岗岩地球化学特征、锆石 U-Pb 年龄及其地质意义
Geochemical Characteristics, Zircon U - Pb Age of the Early Permian Alkaline Granite and Its Geological Significance in the Aershanbulage,Innner Mongolia
摘要
Abstract
The authors carry out some geochemical analysis on a alkaline granite pluton in the Aershanbulage,In-ner Mongolia.The age of this pluton is around 297 ± 3 Ma~295.8 ± 1.4 Ma according to the U-Pb dating by LA-ICP-MS.Rock generally contains aegirine、riebeckite,such as alkaline dark minerals,and with high silicon,alkali rich,poor FeOt、MgO style characteristics.Aluminium saturation index A/CNK is between 0.85 ~ 1.02.Trace elements are rich in Rb、Th、Zr、Hf and depleted of Ba、Ti、Nb、Sr、P.The LREE of these samples are highly differentiated,but the HREE present flat distributions.The element of Eu displays obvious negative anomaly with the δEu between 0.25 and 0.69.All the geochemical features above define this monzontic granite as the A-type granite,indicating the early Permian area has entered the post-tectonic tectonic environment.关键词
阿尔善布拉格/碱性花岗岩/锆石U-Pb年龄/A型花岗岩Key words
Aershanbulage/alkaline granite/Zircon U - Pb age/A-type granite分类
地质学引用本文复制引用
肖中军..内蒙阿尔善布拉格一带早二叠世碱性花岗岩地球化学特征、锆石 U-Pb 年龄及其地质意义[J].地质调查与研究,2015,38(3):171-181,191,12.基金项目
中国地质调查"内蒙古1/5万浩宾塔拉幅、吉尔戈郎图幅、阿登锡勒大队幅、塔拉布拉格幅、朝勒更爱力幅、阿尔善布拉格幅区域地质矿产调查项目(1212011220452)" （1212011220452）
