新疆西准噶尔哈尔加乌组地层重新厘定及其意义——来自地质地球化学和年代学的证据  

REDEFINITION OF HAERJIAWU FORMATION AND ITS SIGNIFICANCE IN WEST JUNGGAR,XINJIANG:CONSTRAINTS FROM EVIDENCE OF GEOLOGY,GEOCHEMISTRY AND GEOCHRONOLOGY

作　　者：靳松[1,2] 张兆祎 荣桂林 陈立武 杨红宾 孙绍利[4] 

机构地区：[1]中国地质大学地球科学学院,中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉430074 [2]河北省地质调查院,河北石家庄050081 [3]承德市地质矿产勘查开发局,河北承德067000 [4]河北省承德市国土资源规划设计院,河北承德067000

出　　处：《矿物岩石》2013年第1期77-86,共10页Mineralogy and Petrology

基　　金：新疆自治区地质调查项目(XJQDZ2008-01;XJQDZ2008-03)

摘　　要：在新疆吉木乃县珠万喀腊一带分布着一套以中基性火山岩为主的陆相中基性-中酸性火山岩建造和一套陆相含煤正常碎屑岩夹少量中基性火山岩建造,前人将其划归为下二叠统哈尔加乌组。通过对新疆西准噶尔地区哈尔加乌组地层进行详细的野外地质调查、研究和划分,依据实测地质剖面、岩石组合特征、地球化学特征、生物组合特征和LA-ICP-MS锆石U-Pb测年数据:Th/U比值变化范围为0.44～1.28,206Pb/238 U年龄加权平均值为305Ma±2Ma,将哈尔加乌组地层厘定为巴塔玛依内山组二段。A set of basic and intermediate-acid volcanic rock formation consisting mainly of basic volcanic rocks,and a terrestrial coal-bearing clastie rocks interbedded with a small amount of normal basic volcano rock formation occurred in Zhuwankala area of Jimunai County,Xinjiang. Previous workers defined these rocks as Haerjiawu Formation of Lower Triassic. Through detailed field geological investigation, based on the measured geological section, rock assemblage characteristics,geochemical characteristics, biological characteristics and LA-ICP-MS U-Pb zircon dating data,it is considered that the former Haerjiawu Formation better be renamed as Batamayineishan Formation. This provide important basis for Paleozoic strata division and comparison in the west Junggar region of Xinjiang area.

关 键 词：西准噶尔 哈尔加乌组 巴塔玛依内山组 地层厘定 LA-ICPMS锆石定年 

分 类 号：P535[天文地球—古生物学与地层学] P595[天文地球—地质学]