四川壤塘地区岩石地球化学特征及其物源分析

Lithogeochemistry and Material Source in the Zamtang Region,Sichuan

对四川壤塘地区西康群砂泥岩的主量元素、微量元素进行研究表明,其地球化学特征与大陆岛弧和活动大陆边缘沉积物相似。物源区以长英质岩为主,指示化学风化程度的CIA指数及成分成熟度的CIV指数,表明较低的化学风化作用,反映了晚三叠世的半干旱气候环境。综合其它地质资料认为,壤塘地区西康群砂泥岩的物源区可能为康滇古陆。

Geochemical study of major and minor elements indicates that sandstone and mudstone of the Xikang Group in the Zamtang region,Sichuan belong to deposits in an active continental margin and island arc setting.The provenance consists of felsic rock.CIA value and CIV value show weak chemical weathering in the Late Triassic semiarid climate conditions.The provenance could be the Kangdian old land.