松辽盆地南部北带基底岩浆岩SHRIMP锆石U-Pb年龄及其地质意义  

Zircon SHRIMP U-Pb Dating of Igneous Rocks from the Basement of North Belt of the South Songliao Basin and Its Geological Significance

作　　者：王兴光[1] 王颖[2] 

机构地区：[1]中国地质大学,北京100083 [2]吉林油田公司勘探开发研究院

出　　处：《地质科技情报》2007年第1期23-27,共5页Geological Science and Technology Information

基　　金：中国科学院知识创新工程项目"中国北方造山带大地构造研究"(KZCX2-104)

摘　　要：采用高分辨率二次离子探针(SHRIMPⅡ)定年技术对松辽盆地南部北带两件岩浆岩样品进行了详细分析,结果表明:蚀变安山岩的形成年龄为(368±7)Ma;而二长花岗岩的岩浆侵入年龄为(331±8)Ma。松辽盆地南部基底至少由两期组成:早前寒武纪[(1 839±7)Ma]变质结晶基底和晚古生代火山岩及同期侵入岩基底。认为研究区北带可能不存在大规模的前寒武纪结晶基底。Previous studies suggested that the basement of the south Songliao Basin is mainly composed of Carboniferous-Permian low-grade metamorphic volcanic-sedimentary struction without any precise chrono- logical data. In this paper, Sensitive High Reseloution Ico Micro-Probe Ⅱ（SHRIMP Ⅱ） is used to analyze two igneous samples from the north belt of the south Songliao Basin. It is concluded that the altered andesite sample（2003JB86）, formed in （368 ± 7） Ma and the monzonitic granite sample （2003JY1）, formed in （331±8） Ma. Combined with the previous study, it is suggested that the south Songliao Basin comprises of two period basements at least： early pre-Cambrian meta-crystallizationE （1 839±7）Ma] and late Palaeozoic igneous rocks. It is assumed that large scale pre-Cambrian basement may not have occurred on the north belt of south Songliao Basin.

关 键 词：SHRIMP定年 基底 松辽盆地南部 

分 类 号：P597.3[天文地球—地球化学]