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《Journal of Jilin University(Earth Science Edition)》 2010-05
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Genetic Chariciterics of Illite in the Carboniferous-Permian Pelitic Rocks in East Jilin Province

HU Da-qian,HONG Yan,YU Jie-jiangCollege of Earth Sciences,Jilin University,Changchun 130061,China  
The Carboniferous-Permian strata in east Jilin is mainly composed of pelitic rocks for which no detailed mineralogical research works have been done up to now.By using JSM-6700F field emission scanning electron microscope and INCA EDS,the authors focused on the micro-morphology and composition of illite,the most important clay mineral of the pelitic rocks.The crystallinity,polytype and b0 dimension of illite were measured using a D/mas-2500X-ray diffractometer.The illite crystallinity ranges from 0.26 to 0.76 and averages at 0.44.The illite polytype of(muscovite) is featured by 1Md,1Md+2M1 and 2M1 types.The illite(muscovite) b0 dimension ranges from 8.996 to 9.045 and averages at 9.007.The illite crystallinity of the Carboniferous rocks ranges from 0.26 to 0.50,averages at 0.35.Their polytype is predominantly 2M1,averaged b0 dimension is 9.011.These results suggest that the Carboniferous rocks probably were formed in a low anchizone.In contrast,the illite crystallinity of the Permian rocks ranges from 0.26 to 0.50,averages at 0.42,its polytype is mainly 1Md+2M1,mean b0 dimension is 9.004,indicating a late diagenetic zone.
【Fund】: 国家重点基础研究发展计划项目(2009CB219303);; 中国石油化工有限责任公司项目(GO800-06)
【CateGory Index】: P571
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