鄂尔多斯盆地中东部奥陶系马家沟组马五6亚段硬石膏产状类型与成因*
邓伟1,2, 谭秀成1,2, 张道锋3, 钟寿康1,2, 董国栋3, 肖笛1,2, 卢子兴3, 杨梦颖1,2, 熊鹰1,2, 聂万才4

Occurrence types and genesis of anhydrite from the Ma56 submember of Ordovician Majiagou Formation in central and eastern Ordos Basin
Deng Wei1,2, Tan Xiu-Cheng1,2, Zhang Dao-Feng3, Zhong Shou-Kang1,2, Dong Guo-Dong3, Xiao Di1,2, Lu Zi-Xing3, Yang Meng-Ying1,2, Xiong Ying1,2, Nie Wan-Cai4
鄂尔多斯盆地中东部奥陶系马家沟组马五6亚段鸡雏状或角砾状硬石膏的产状特征 a—膏溶角砾岩,发育少许的溶沟将膏岩横向贯穿,整体性较好,仅局部被切割成角砾状,云泥充填,岩心照片,S446井,4117.22 m;b—角砾状硬石膏,可见良好的基岩带、基岩边缘产生的溶蚀带及中心的再沉淀带,基岩边缘硬石膏逐渐被离解,孔隙局部被泥质充填,在孔隙中心再次沉淀析出,单偏光,S446井,4117.20 m;c—鸡雏状或角砾状硬石膏,角砾间泥质、细—粉晶方解石充填,单偏光,T112井,3349.41 m;d—鸡雏状或角砾状硬石膏,硬石膏已被完全溶蚀切割成孤立的角砾,角砾边缘具有可拼接特征,角砾边缘存在细小的膏质残余,角砾间充填云泥,单偏光,T105井,3726.09 m;e—膏溶角砾岩,高角度溶沟将膏岩切割成角砾状,可见云泥充填,残余块状结构,岩心照片,T112井,3388.58 m;f—暴露面(红线),左侧为泥晶云岩,右侧为膏溶角砾岩,角砾间被云泥与膏质混杂充填,岩心照片,T112井,3377.92 m