塔西南奥陶系玛列兹肯群碎屑岩年代学研究  

Detrial Geochronology Studies on the Malieziken Group of Ordovician in Southwestern Tarim

作　　者：钱一雄[1] 王亮[2] 康志宏[3] 陈跃[1] 贾存善[1] 田蜜[1] 张永东[1] Qian Yixiong;Wang Liang;Kang Zhihong;Chen Yue;Jia Cunshan;Tian Mi;Zhang Yongdong(Research Institute of Experimental Geology,CNSPC,Box916,Wuxi,Jiangsu,214151,China;Exploration&production research institute,Northwest Company,SINOPEC,Urumqi,Xinjiang,830011,China;China University of Geosciences,Beijing,100083,China)

机构地区：[1]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214151 [2]中国石化西北油气分公司石油勘探开发研究院,新疆乌鲁木齐830011 [3]中国地质大学(北京),北京100083

出　　处：《新疆地质》2018年第1期30-37,共8页Xinjiang Geology

基　　金："973"(2012CB214802);国家重大专项(2011ZX05005-0023;2011ZX05008-003-11);中石化科技部项目(P10023)联合支持

摘　　要：对塔西南奥陶系玛列兹肯群恰特组、坎地里克组中的含砾石英粗砂岩进行了锆石特征及U-Pb同位素年代学研究。二组物源区年龄谱相似,以中元古界延展系—狭带系变质基底的再沉积锆石为主;其中,坎地里克组中的加里东中晚期的岩浆型比例相对较高;但两者均指示了较稳定的构造-沉积环境;恰特组、坎地里克组中的最年轻岩浆锆石分别为(459.6±9)Ma和(465.9±9.1)Ma;恰特组次之,年龄为(477.2±9.2)Ma;谐和年龄为(482.3±5.5)Ma,反映了玛列兹肯群中原定的下奥陶统恰特组及坎地里克组应为上奥陶统,可能属岛弧(后)盆地的沉积环境。The age of Malieziken group of Ordovician can provide an important implication for evolution of the Lower Paleozoic sedimentary basin in Southwestern Tarim.This paper reports zircon SHRIMP U-Pb dating results of gravelbearing sandstones of Qiate Formation and Kandilike Formation,Malieziken Group of Ordovician in Southwestern Tarim.The ages spectrum recorded by zircon SHRIMP U-Pb dating for Qiate Formation and Kandilike Formation are similar,most of source materials believed to come from re-sedimentary origin in metamorphic rocks basement in Extended system narrow band system of Neo-Proterozoic,indicating that it had been deposited in steady tectonic and sedimentary environment,with an exception of high ratios of magmatic rocks in Kandilike Formation.compare to that of Qiate Formation.The youngest ages recorded by zircon SHRIMP U-Pb dating is(459.6±9)Ma for Qiate Formation and(465.9±9.1)Ma for Kandilike Formation.The accurate age for Qiate Formation and Kandilike Formation,Malieziken Group,which was formerly believe to the Early Ordovician,now has been confirmed no earlier than the Middle and Late Ordovician.

关 键 词：塔西南 含砾石英粗砂岩 上奥陶统 锆石U-PB年龄 玛列兹肯群 

分 类 号：P588.345[天文地球—岩石学] P595[天文地球—地质学]