准噶尔盆地北部石炭纪火山碎屑岩锆石Hf同位素特征及地质意义  

Zircon Hf isotopic characteristics and its geological significance of Carboniferous volcanic clastic rocks in northern Junggar Basin

作　　者：侯斌 陈刚 杨甫[4] 丁利娜[1] Hou Bin;Chen Gang;Yang Fu;Ding Lina(Xi′an Composed Information Technology Co.Ltd.,Xi′an 710075,Shannxi,China;State Key Laboratory of Continental Dynamics,Xi′an 710069,Shannxi,China;Department of Geology,Northwest University,Xi′an 710069,Shannxi,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Xi′an 710021,Shannxi,China)

机构地区：[1]西安集灵信息技术有限公司,陕西西安710075 [2]大陆动力学国家重点实验室,陕西西安710069 [3]西北大学地质学系,陕西西安710069 [4]国土资源部煤炭资源勘查与综合利用重点实验室,陕西西安710021

出　　处：《地质学刊》2020年第1期108-116,共9页Journal of Geology

基　　金：教育部留学人员短期回国工作专项经费资助项目(2011-1568);高等学校博士学科点专项科研基金项目(2011610111-0006);陕西省自然科学基础研究计划重点项目(2012JZ5001);留学人员科技活动择优专项经费项目(陕外专2010-26);国家基础科学人才培养基金项目(YY2011-04)。

摘　　要：准噶尔盆地的基底属性及形成时代一直存在认识上的分歧。使用LA-MC-ICP-MS法对准噶尔盆地北部石炭纪火山碎屑岩钻井岩芯样品中的52颗锆石进行原位微区Hf同位素及U-Pb同位素测试分析,结合研究区的古地质特征,分析区内早期地壳的形成演化过程。结果表明,准噶尔盆地北部的早期地壳形成于距今1.4 Ga之前,并呈持续生长状态,在0.3~0.9 Ga期间壳幔相互作用持续进行,盆地北部区域经历了多阶段的构造演化过程。There have been different opinions on the basic attributes and formation times of Junggar Basin.With LA-MC-ICP-MS,52 zircons from drilling core samples of Carboniferous pyroclastic rocks in northern Junggar Basin were analyzed by in-situ micro-area Hf and U-Pb isotopic experiments.In view of regional paleo-geological characteristics,the formation and evolution of the early crust in the study area were analyzed.The results show that the early crust in the northern Junggar Basin was formed at least before 1.4 Ga,and showed a continuous growth state.The crust-mantle interaction continued from 0.9 Ga to 0.3 Ga,and the northern Junggar Basin underwent multi-stage tectonic evolution.

关 键 词：锆石 LA-MC-ICP-MS HF同位素 U-PB同位素 准噶尔盆地 

分 类 号：P597[天文地球—地球化学]