摘要
吉林东部石炭—二叠系主要是一套泥质岩石,其详细深入的矿物学工作尚不多见。利用JSM-6700F场发射电镜及INCA能谱仪,研究了伊利石的显微形貌和微区成分。采用D/max-2500X-射线衍射仪,研究了伊利石的结晶度、多型和b0值。结果表明:研究区伊利石结晶度变化于0.26~0.77,平均值为0.44;伊利石(白云母)多型有3种类型,分别为1Md型、1Md+2M1混合型和2M1型;伊利石(白云母)b0值为8.996~9.045,平均值为9.007。石炭系伊利石结晶度变化于0.26~0.50,平均值为0.35,主要呈2M1多型,b0平均值为9.011,主要是低级近变质带的产物;二叠系伊利石结晶度变化于0.26~0.50,平均值为0.42,主要为1Md+2M1混合型多型,b0平均值为9.004,主要为晚期成岩带的产物。
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.
出处
《吉林大学学报(地球科学版)》
EI
CAS
CSCD
北大核心
2010年第5期1035-1040,共6页
Journal of Jilin University:Earth Science Edition
基金
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)
关键词
吉林省
石炭-二叠系
伊利石结晶度
伊利石多型
伊利石b0值
极低级变质作用
沉积岩
Jilin Province
Carboniferous - Permian Period
illite crystallinity
illite polytype
illite b0 dimension
very low-grade metamorphism
sedimentary rocks