摘要
1:25万三道岭幅区调项目在巴里坤萨尔乔克东侧冲沟原中泥盆统头苏泉组地层中,发现一套中级变质岩系,根据岩石组合、变质变形等方面的对比,研究认为该套地层与头苏泉组存在较大差异,因此需要重新厘定.为了准确确定该套地层的岩石单元归属,在萨尔乔克东侧冲沟的剖面上,先后两次采集同位素年龄样品D1710TW1和D1710TW2,从石英片岩中挑选51颗锆石进行了LA—ICP—MS锆石U—Pb定年研究.研究认为该组锆石具有多来源、多期次的特征;代表地层形成时代的锆石U—Pb年龄为450.3±4.3Ma,该套地层的岩性、岩相和变质程度,在区域上可以和乌列盖组对比,因此本文将其厘定为上奥陶统乌列盖组;其中的碎屑锆石数据表明该地存在前寒武纪基底.
Saerqiaoke area strata was divided into Tousuquan Formation(D_2ts) by the past research.But1:250 000 regional geological surveying of Sandaoling thought:Saerqiaoke area strata has big difference with Tousuquan Formation on lithology,facies and metamorphism,so should be redefined.Based on zircon U-Pb age and contact relationship of strata,the geological age of Saerqiaoke was revised as early late ordovician,and was divided into Wuliegai Formation(O_3w).The research also found precambrian basement in Saerqiaoke area strata.
出处
《新疆大学学报(自然科学版)》
CAS
北大核心
2016年第4期464-470,共7页
Journal of Xinjiang University(Natural Science Edition)
基金
教育部博士点基金(20100205110003)
中国地质调查局项目"新疆1:25万三道岭幅(K46C001002)区调(修测)"(1212011120470)联合资助
关键词
头苏泉组
乌列盖组
地层
萨尔乔克
新疆
Tousuquan Formation
Wuliegai Formation
strata
Saerqiaoke
Xinjiang