华南地区栖霞组“菊花石”假象与海泡石矿成因关系探讨  

REMARKS ON ORIGIN OF SEPIOLITE WITH EVIDENCES FROM REPLACEMENT HISTORY OF NODULAR CELESTITE IN THE CHIHSIA FORMATION OF SOUTH CHINA

作　　者：颜佳新[1] 张宽忠 CarlsonEH 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]四川省区调队,双流610231 [3]Department of Geology,Kent State University

出　　处：《矿物岩石》2000年第4期1-5,共5页Mineralogy and Petrology

基　　金：国家自然科学基金项目(批准号49602030,49972038)

摘　　要：根据对华南地区二叠系栖霞组内菊花石假象的成因研究 ,结合对该组内燧石结核、菊花石内正延性玉髓和海泡石形成时代关系的观察 ,认为华南地区栖霞组内的海泡石形成于早期成岩作用过程中 ,与该组内燧石结核和菊花石假象内的正延性玉髓同期形成。其成因既与高盐度的沉积环境或高盐度的成岩环境条件无关 ,也与热液活动无关。Based on microprobe analysis on the replacement calcites in the nodular celestite pseudomorphs from the Permian Chihsia Formation of South China,two phases of diagenetic environments were recognized during the replacement of the nodular celestite.The early phase was characterized by fluid rich in silica and Mg \{2+\} and the later by relatively low Mg \{2+\}/Ca \{2+\} ratio.It was during the early phase diagenesis that the contemporary sepiolite,length slow chalcedony in the celestite pseudomorphs and chert nodules in host rocks formed.Subsequently,a possible saline diagenetic condition or hydrothermal activity held previously was ruled out.

关 键 词：栖霞组 海泡石 成因 

分 类 号：P571[天文地球—矿物学]