京西门头沟叶腊石泥岩矿物学特征
发布时间：2018-08-01 12:17
【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:Al_(1.9965)(Si_(3.9982)O_(10))(O_2H_(2.0180))。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。
[Abstract]:There are many associated minerals in coal-bearing strata in China, and the amount of resources is large. Among them, pyrophyllite mudstone in Mentougou Carboniferous and Permian coal series in western Beijing is rare and has important value in exploitation and utilization. The mineralogical characteristics of pyrophyllite from the Xishan Mentougou Hongmiaoling formation in Beijing were studied from the mineralogical point of view by means of X-ray diffraction (XRD), IR (IR), thermal analysis (TA), electron probe (EPM) and so on. The results show that the mudstone pyrophyllite is symbiotic with hard boehmite and hard chlorite etc. The pyrophyllite is usually cryptic or microcrystalline scale and distributes orientedly under polarizing microscope. The chemical formula of pyrophyllite crystal structure based on microsphere electron probe chemical analysis is: 1: al _ (1.9965) (Si _ (3.9982) O _ (10) () O _ (2.0180).) Based on the sedimentary geological background and the characteristics of symbiotic mineral assemblage, the formation temperature of pyrophyllite is inferred to be about 300 鈩，
本文编号：2157550
[Abstract]:There are many associated minerals in coal-bearing strata in China, and the amount of resources is large. Among them, pyrophyllite mudstone in Mentougou Carboniferous and Permian coal series in western Beijing is rare and has important value in exploitation and utilization. The mineralogical characteristics of pyrophyllite from the Xishan Mentougou Hongmiaoling formation in Beijing were studied from the mineralogical point of view by means of X-ray diffraction (XRD), IR (IR), thermal analysis (TA), electron probe (EPM) and so on. The results show that the mudstone pyrophyllite is symbiotic with hard boehmite and hard chlorite etc. The pyrophyllite is usually cryptic or microcrystalline scale and distributes orientedly under polarizing microscope. The chemical formula of pyrophyllite crystal structure based on microsphere electron probe chemical analysis is: 1: al _ (1.9965) (Si _ (3.9982) O _ (10) () O _ (2.0180).) Based on the sedimentary geological background and the characteristics of symbiotic mineral assemblage, the formation temperature of pyrophyllite is inferred to be about 300 鈩，
本文编号：2157550
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