摘要
西天山昭苏县叶勒门特地区位于伊犁-中天山地块南缘活动带,本文以该地区石英二长岩为对象,从岩石学、LA-ICP-MS锆石U-Pb定年、岩石地球化学特征等方面对其进行研究。结果表明:该岩体形成于早志留世,锆石年龄为(436.9±2.7)Ma;石英二长岩表现出富钾、准铝质碱性岩石系列特征;稀土元素的Eu(δEu=0.59~0.64)负异常明显,La、Nd、Y、Zr元素富集,Sr、Nb、Ti、P元素亏损,表现出类似A花岗岩的特征;构造环境判别图显示叶勒门特地区石英二长岩形成于南天山洋洋壳向北侧伊犁-中天山地块俯冲过程中的陆缘弧后拉张环境。
Yelemente area of Zhaosu county in west Tianshan mountain is located in the activity zone of southern margin of Yilin-middle Tianshan block.This paper studies the quartz monzonite in this area about the aspects of petrology,LA-ICP-MS zircon U-Pb dating and petrogeochemical characteristics.The result shows that the rock mass was formed in early Silurian period,zircon age is(436.9±2.7)Ma;quartz monzonite shows a series of characteristics of potassium-rich and quasi-aluminum alkaline rocks;the Eu of REEs(δEu=0.59-0.64)was of obviously negative anomaly,La、Nd、Y、Zr elements were enriched,Sr、Nb、Ti、P elements were depleted,those show the characteristics which is similar to A granite.The tectonic settting discrimination map shows that the quartz monzonite in Yelemente area is formed in the continental margin arc tension setting during the subduction of the Yili-Tianshan block in the north side of south Tianshan oceanic crust.
作者
邓宇飞
白龙
赵磊
李欢
刘军省
鞠林雪
杨宏图
武奕立
Deng Yufei;Bai Long;Zhao Lei;Li Huan;Liu Junxing;Ju Linxue;Yang Hongtu;Wu Yili(Geological Institute of China Chemical Geology and Mine Bureau,Zhuozhou,Hebei,072754,China;Ulanqab Geological Exploration Project Management Center,Ulanqab,Inner Mongolia,012000,China;Beijing Institute of Geo-exploration Technology,Beijing,100120,China)
出处
《化工矿产地质》
CAS
2021年第2期116-122,共7页
Geology of Chemical Minerals
基金
中国地质调查局“天山-北山成矿带那拉提-营毛沱地区地质矿产调查”子项目“新疆西天山克拉克斯赛依金铜矿1∶5万地质矿产综合调查”(12120115021201)。
