东天山博格达造山带黑沟环状花岗杂岩锆石SHRIMP U-Pb测年及地质意义  

Zircon SHRIMP U- Pb dating and geological significances of Heigou granitic complex from Bogda orogenic,eastern Tianshan

作　　者：施文翔[1] 田少亭[1] 冯红刚[1] 冯江鹏[1] 李艳[1] 罗婷[2] 

机构地区：[1]新疆地质矿产勘查开发局第一区域地质调查大队,乌鲁木齐830011 [2]中国地质大学(武汉)研究生院,武汉430074

出　　处：《桂林理工大学学报》2015年第2期251-256,共6页Journal of Guilin University of Technology

基　　金：中国地质调查局项目(12120113042500)

摘　　要：博格达造山带黑沟环状花岗杂岩,中心为二长花岗岩,内环为花岗闪长岩,外环为辉长岩、(辉石)闪长岩、石英闪长岩、英云闪长岩。对闪长岩、花岗闪长岩和二长花岗岩进行SHRIMP锆石U-Pb定年,分别获得了309.0±6.2 Ma、311.1±3.8 Ma和308.9±4.4 Ma的结晶年龄,均为晚石炭世。该岩体可能为博格达裂谷闭合,进入板内伸展环境的产物。The rock in Heigou ring granitic complex in Bogda orogenic belt distributed in ring-shaped.The center is monzonitic granite,while the inner ring is granodiorite,the outer ring consists of gabbro,(pyroxene) diorite,quartz diorite and tonalite.The detailed chronology research by zircon SHRIMP U -Pb could date from the diorite,granodiorite and monzonitic granite,obtained the crystallization age of 309.0 ±6.2 Ma,311 ±3.8 Ma,308.9 ±4.4 Ma respectively,representing their intrusive age of late Carboniferous.The Heigou ring gra-nitic complex is the product of a tectonic framework transformation from the closing of Bogda rift to orogenic up-lift stage.

关 键 词：环状花岗杂岩 晚石炭世 SHRIMP锆石U-PB测年 博格达山带 

分 类 号：P588.121[天文地球—岩石学]