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.
出处
《矿物岩石》
CAS
CSCD
北大核心
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)
关键词
栖霞组
海泡石
成因
Chihsia Formation
sepiolite
origin
