北京西山地区下苇甸剖面寒武系张夏组鲕粒硅化成因探讨*
郭芪恒, 金振奎, 朱雷, 朱小二, 王金艺, 吴进, 李思澎

Mechanism for silicification of ooid:Example from the Cambrian Zhangxia Formation at Xiaweidian section in Western Hills of Beijing
Guo Qi-Heng, Jin Zhen-Kui, Zhu Lei, Zhu Xiao-Er, Wang Jin-Yi, Wu Jin, Li Si-Peng
北京西山地区下苇甸剖面寒武系张夏组鲕粒硅化特征
a—单晶鲕,单偏光,局部硅化,黄色箭头指示硅化套,可见有机质膜(鲕粒外暗色环边);b—单晶鲕,正交偏光,鲕粒边部硅化明显,黄色箭头指示硅化套;c—单晶鲕,正交偏光,边部发育完整硅化套,黄色箭头指示硅化套;d—单晶鲕,正交,边部发育硅化套(黄色箭头所指)及栉壳状方解石(红色箭头所指);e—单晶鲕,正交偏光,边部发育硅化及栉壳状方解石,后期硅质切穿栉壳状方解石,黄色箭头指示硅化套,红色箭头指示栉壳状方解石;f—单晶鲕,边缘有机膜包壳