地质力学学报2016，Vol.22Issue(4)：1032-1048,17.
新疆哈尔里克早石炭世A型花岗岩的岩石成因及构造意义
PETROGENESIS AND TECTONIC SIGNIFICANCE OF EARLY CARBONIFEROUS A-TYPE GRAINTE IN HARLIK, XINJIANG
摘要
Abstract
The alkali-feldspar granite is located at the area of Nanshankou,western part of the Harlik Mountain.Its LA-ICP-MS zircon U-Pb age is 331.3 ± 1.9 Ma.Therefore,the granite is formed in the late stage of Early Carboniferous.The dark minerals in the rock are mainly biotite,with litte Na amphibolite.This type of granite is riched in alkali elements,poor in calsium,magnesium,and has low content of aluminum and iron oxide.The rock is riched in large ion.lithosphile elements,such as Rb,Th and K.It has abundant HFSE elements and depleted in Ba,Sr and Eu.The 10000 Ga/A1 value is varied from 2.93 ～ 3.80.It indicates that the rock is A-type granite,formed in intraplate tectonic settings,instead of the previous island arc environment.Its εNd (t) values range from 5.66 to 6.12,the Nd model ages are 600 ～ 620 Ma.It tells that the magma may originate from the young crust.Based on the results of the 1∶50000 regional geological survey,the Bogada rift was extended during Early Carboniferous,and closed at the late stage of Early Carboniferous.The Late Early Carboniferous alkali-feldspar granites should formed in the rift environment,instead of coming from the previous post-collisional or arc tectonic setting.关键词
A型花岗岩/早石炭世晚期/裂谷/哈尔里克Key words
A-type granites/late Early Carboniferous/rift/Harlik分类
天文与地球科学引用本文复制引用
王良玉,廖群安,肖典,罗婷,赵浩,刘鸿飞,王国灿..新疆哈尔里克早石炭世A型花岗岩的岩石成因及构造意义[J].地质力学学报,2016,22(4):1032-1048,17.基金项目
中国地质调查局“特殊地质地貌区填图试点”项目(DD20160060 （）
12120114042801) （）
