东准噶尔萨尔托海铁矿区闪长岩LA-ICP-MS锆石定年及地质意义  

LA-ICP-MS Zircon U-Pb Age and Geological Implications of Diorite Pluton in the Saertuohai Iron ore district, East Junggar, Xinjiang

作　　者：高文娟[1] 章斌 陈风河[1] 刘海龙[1] 李强[3] 

机构地区：[1]河北省地矿局探矿技术研究院,河北三河065201 [2]同煤集团朔州煤电公司小峪煤矿,山西朔州038301 [3]中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点开放实验室,北京100037

出　　处：《新疆地质》2015年第2期199-205,共7页Xinjiang Geology

基　　金：国土资源部公益性行业科研专项经费项目(201211073)资助

摘　　要：萨尔托海铁矿位于东准噶尔,铁矿体主要呈脉状、透镜状、似层状赋存于闪长岩中或与巴塔玛依内山组凝灰岩、玄武岩的接触带上。对矿区与矿化有密切空间关系和成因联系的闪长岩进行锆石LA-ICP-MS U-Pb年龄测定,获得23颗锆石的206Pb/238U加权平均年龄为(269.1±0.7)Ma(MSWD=0.9),限定矿床形成时代为中二叠世。闪长岩与晚石炭—中二叠世后碰撞阶段花岗岩类时代一致,同为准噶尔地区晚古生代晚期大规模岩浆活动产物。The Saertuohai iron deposit is located in the East Junggar, the iron orebody mainly distributes as veins, lentic-ular and bedded in diorite,or at the contact zones between diorite and tuff, basalt of Batamayineishan Formation. In this paper, we chose diorite which has close spatial and genetic relationship with Fe mineralization for zircon LA-ICP-MS U-Pb dating, 23 zircons yielded 206Pb/238U weighted mean age of 269.1 ± 0.7 Ma （MSWD=0.9）, suggests that Saertuo-hai iron deposit formed in Middle Permian. The age of diorite is in accordance with late Carboniferous-middle Permian collisional granitoid, indicates that they are the same products of large scale magmatism in Junggar area during late Paleo-zoic.

关 键 词：东准噶尔 萨尔托海 锆石U-PB定年 中二叠世 闪长岩 

分 类 号：P597.3[天文地球—地球化学] P618.31[天文地球—地质学]