煤田地质与勘探2017，Vol.45Issue(3)：25-31,7.DOI:10.3969/j.issn.1001-1986.2017.03.005
京西门头沟叶腊石泥岩矿物学特征
Mineralogic characteristics of pyrophyllite mudstone in Mentougou, western Beijing
摘要
Abstract
The associated mineral deposits in coal-bearing strata in China have many different types and large amount of resources. The pyrophyllite mudstone in Carboniferous-Permian coal-bearing strata in Mentougou of western Bei-jing is distinctive and rare, and it is of great significance for exploitation and utilization. The mineralogical features of pyrophyllite in Hongmiaoling Formation in Mentougou, western Beijing, were studied by use of polarizing micros-copy, X-ray diffraction (XRD), infrared absorption spectra, thermal analysis and electron probe (EPM), etc. The re-sults indicated that the pyrophyllite mineral is co-existed with diasporite and chloritoid. The pyrophyllite under polar-izing microscope shows aphanitic or microcrystalline flakes with directional distribution. Based on chemical analysis and calculation of electron probe in micro area the chemical formula for crystal structure of pyrophyllite was calcu-lated as: Al1.9965(Si3.9982 O10)(O2H2.0180). According to the characteristics of sedimentary geologic background and minerals association, it was concluded that the formation temperature of pyrophyllite was about 300℃, and it was transformed from kaolinite under the condition of dynamic metamorphism by tectonic stress.关键词
北京西山/叶腊石/硬水铝石/硬绿泥石/成因Key words
western Beijing/pyrophyllite/diasporite/chloritoid/genesis分类
天文与地球科学引用本文复制引用
史斌,刘鑫,辛蜜蜜,林元惠,赵云鹏,刘钦甫..京西门头沟叶腊石泥岩矿物学特征[J].煤田地质与勘探,2017,45(3):25-31,7.基金项目
北京市共建项目(20121141301) （20121141301）
大学生创新训练项目(201411413016) Beijing Joint-Construction Project(20121141301) （201411413016）
Innovative Training Program for College Students(201411413016) （201411413016）
