浙江长兴煤山剖面P/T界线附近粘土矿物研究

Study on Clay Minerals of P/T Boundary in Meishan Section , Changxin , Zhejiang Province

通过对浙江长兴煤山(D)剖面二叠系—三叠系 (P/T)界线附近地层中的粘土矿物分析,显示粘土矿物的组合及含量的变化同粘土矿物的结晶度没有必然的联系,而同地层组段的变化相一致,粘土矿物组合的变化反映了当时的气候、物源及地理条件的变化;同时,伊利石的结晶度也不具有地层梯度的特征。但是,无论是粘土矿物组合还是伊利石结晶度,在P/T界线附近都发生了明显的变化,表明本区当时海洋酸碱度和温度的剧烈变化,这可能导致了二叠纪末期海洋生物的大规模灭绝。

By analyzing the clay minerals of P/T boundary in Meishan Section show that the paragenetic association has no relationship to crystalization, but conincides with the change of formations and members, which reflect the change of climate, source and geography. IC has no notable regular variation; otherwise , no matter the paragentic association or IC have changed evidently, indicate that pH and temperature have changed acutely, which may result in the mass extinction of the Permian marine invertebrates at the end of Permian.