煤田地质与勘探2017，Vol.45Issue(2)：39-44,6.DOI:10.3969/j.issn.1001-1986.2017.02.007
鄂尔多斯盆地东缘泥质岩黏土矿物特征及其地质意义
Clay mineral characteristics and its geological significance in argillaceous rock in eastern margin of Ordos basin
摘要
Abstract
In order to study the paleoclimatic characteristics of the Carboniferous-Permian and its relationship with coal formation in eastern margin of Ordos basin,XRD diffraction analysis and SEM methods are used to study the composi-tion of clay minerals and its geological significance. The results show that the mixed layer of kaolinite , illite and smectite are the major clay minerals in argillaceous rock, followed by illite and chlorite. The vertical distribution of clay minerals in argillaceous rock reflects that kaolinite in Shanxi Formation of Qiaotou section, Palougou section, upper of Chengji-azhuang section has high content. And the bottom of Taiyuan Formation of Qiaotou section, the upper of Taiyuan Forma-tion and the middle of Benxi Formation in Chengjiazhuang section have high content of kaolinite too. Illite has high con-tent in Shanxi Formation of each section. Chlorite has higher content in the middle and the upper of Shanxi Formation and lower content in Taiyuan Formation. Under the SEM, clay minerals are in regular shape and do not have obvious ero-sion marks. Illite crystallinity is 0.42°Δ2θ~0.63°Δ2θ, with an average of 0.47°Δ2θ, which has good crystallization, I/S interstratified ratio has an average value of 25.1%. According to the characteristics of authigenic clay minerals, the over-all paleoclimate was warm and humid, short-term dry-cold climate existed in early Taiyuan Formation and middle-late Shanxi Formation. Paleoclimate and sedimentary environments reflected mutually the change process of coal accumula-tion, and are the key factors to control coal accumulation in the study area.关键词
黏土矿物/结晶度/古气候/聚煤作用Key words
clay mineral/crystallinity/paleoclimate/coal accumulation分类
天文与地球科学引用本文复制引用
李明培,邵龙义,董大啸,鲁静,李静琴..鄂尔多斯盆地东缘泥质岩黏土矿物特征及其地质意义[J].煤田地质与勘探,2017,45(2):39-44,6.基金项目
中国地质调查局课题(1212011220794) （1212011220794）
国家自然科学基金项目(41572090) Projects of China Geological Survey(1212011220794) （41572090）
National Natural Science Foundation of China(41572090) （41572090）
