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京西门头沟叶腊石泥岩矿物学特征
引用本文: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.
作者姓名:史斌  刘鑫  辛蜜蜜  林元惠  赵云鹏  刘钦甫
基金项目:北京市共建项目(20121141301);大学生创新训练项目(201411413016)
摘    要:我国含煤地层共伴生矿物种类较多,资源量较大,其中京西门头沟石炭-二叠纪煤系中的叶蜡石泥岩比较罕见,具有重要的开发利用价值。利用偏光显微镜、X射线衍射(XRD)、红外光谱(IR)、热分析(TA)、电子探针(EPM)等测试手段,从矿物学角度对北京西山门头沟红庙岭组叶腊石矿物学特征进行研究。结果表明,研究区泥岩叶腊石与硬水铝石、硬绿泥石等矿物共生,偏光显微镜下叶腊石通常呈隐晶或微晶鳞片状,定向分布。基于微区电子探针化学分析计算得出的叶腊石晶体结构化学式为:Al1.9965(Si3.9982 O10)(O2H2.0180)。根据沉积地质背景和共生矿物组合特征,推断叶腊石的形成温度在300℃左右,认为京西门头沟区叶腊石为高岭石受到构造应力影响形成的动力变质矿物。 

关 键 词:北京西山    叶腊石    硬水铝石    硬绿泥石    成因
收稿时间:2016-03-06

Mineralogic characteristics of pyrophyllite mudstone in Mentougou,western Beijing
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 Beijing 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 microscopy, X-ray diffraction (XRD), infrared absorption spectra, thermal analysis and electron probe (EPM), etc. The results indicated that the pyrophyllite mineral is co-existed with diasporite and chloritoid. The pyrophyllite under polarizing 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 calculated 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. 
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