摘要
漠河盆地的中侏罗统。砂岩具有高SiO2、低Fe2O3、FeO、MgO和轻稀土元素富集,重稀土相对亏损,显示弱的负Eu异常的特征。综合分析砂岩的常量元素、微量元素和稀土元素的地球化学特征,经构造判别图解,笔者认为漠河盆地中侏罗统沉积时物源区具有大陆岛弧和活动大陆边缘的构造环境。盆地南侧的额尔古纳地块北缘古生代杂岩可能是盆地的主要物源。
The Middle Jurassic sandstones in the Mohe Basin, Heilongjiang are characterized by high contents of SiO2 and low contents of Fe2O3, FeO and MgO, LREE enrichment, HREE depletion and slightly negative Eu anomaly. The geochemical signatures of major and trace elements and REEs, in integration with the discrimination diagrams for tectonic settings have mirrored that the Middle Jurassic deposits were derived from the continental island ares and active continental margins. The Palaeozoic complexes on the northern margin of the Ergun block may be regarded as the main provenance of the basin.
出处
《沉积与特提斯地质》
CAS
CSCD
2008年第4期93-100,共8页
Sedimentary Geology and Tethyan Geology
基金
国家油气专项(XQ-2004-07-03)
关键词
地球化学
中侏罗统砂岩
物源分析
漠河盆地
geochemistry
Middle Jurassic sandstone
provenance analysis
Mohe Basin
