安徽省宿州市寒武系馒头组页岩的地球化学特征及物源分析

Geochemical Characteristics and Provenance Analysis of the Cambrian Mantou Formation shale in Suzhou, Anhui Province

安徽宿州地区分布大量寒武系馒头组页岩,记录了当时重要的地质信息。通过对主微量元素特征进行分析,研究了物源及源区风化特征。通过研究可知:馒头组页岩CIA值为66.84~67.32,CIW值为98~98.2,PIA值为96.26~96.59,这表明馒头组页岩源区发生强烈风化作用;宿州馒头组页岩来源于长英质火山岩源区,源区构造背景为大陆岛弧。

A large number of cambrian steamed mantou shales are distributed in Suzhou area,Anhui Province,which recorded important geological information at that time.Based on the analysis of the main and trace elements in the shale of the Suzhou steamed head formation,the provenance and weathering characteristics of the source area of the shale of the mantou formation were studied.According to the study,the values of CIA,CIW and PIA of the shale of the mantou formation are 66.84~67.32,98~98.2 and 96.26~96.59 respectively,which indicates that the source ar.ea of the shale of the mantou shales is strongly weathered.The source area of the Shale of the Suzhou mantou Forma.tion is felsic volcanic rock,and the tectonic setting of the source area is continental island arc.