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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。
Through the analysis of clay minerals in the strata near Permian-Triassic (P / T) boundary of Meishan (D) section in Changxing, Zhejiang Province, it is shown that there is no necessary relationship between the combination of clay minerals and the content of clay minerals with their crystallinity , But consistent with the change of stratigraphic assemblages. The changes of clay mineral assemblages reflect the change of climate, provenance and geographical conditions at that time. Meanwhile, the crystallinity of illite does not have the characteristics of stratigraphic gradient. However, both the clay mineral assemblage and the illite crystallinity have undergone significant changes around the P / T boundary, indicating a dramatic change in ocean pH and temperature at this time in the area, which may have led to the large Permian marine life Extinction of the scale.