内蒙古东北地区上古生界粘土矿物组合的成因意义
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摘要
极低级变质作用是指变质作用最低级部分,与石油、天然气和煤等能源矿产的形成有着紧密的关系,是目前地质学研究的重要课题之一。东北地区(佳蒙地块)晚古生代地层主要是由一套海相沉积层和部分陆相沉积层组成,蕴藏着十分丰富的油气资源。前人研究了晚古生代泥质岩石中伊利石的成因标志,得到了区内晚古生代地层主体属于晚期成岩带和低级近变质带的认识。
     作者通过研究不同成岩-极低级变质强度带内伊利石、绿泥石、高岭石、蒙皂石、伊/蒙混层、绿/蒙混层等粘土矿物的相对含量、伊/蒙混层混层比、绿/蒙混层混层比等混层粘土矿物的混层比(蒙皂石在混层粘土矿物中所占比例)的成因标志,表征研究区内的成岩-极低级变质作用;研究不同时代(D、C、P)地层的粘土矿物组合、粘土矿物混层比等与伊利石结晶度的相互关系,从而讨论粘土矿物组合的成因意义。
Northeastern Inner Mongolia lies in eastern East Asia orogenic zone, geotectonic unit consists of EErGuNa and Xingan massif、SongNeng massif and JiaMuSi massif typically. Neopaleozoic formation makes up of a battery of marine deposit formation and partial continental deposit formation, rock are argillaceous rock(mudstone、silty mudstone、argillaceous siltstoue etc.)and carbonate etc., and it contains abundant hydrocarbon resources, which is the most promising area for finding marine exploration activity new area and new territory. The structure in this religion has NE structure and EW structure mainly. By means of XRD and TEM technique, predecessors analyzed and studied illite genesis sign among Neopaleozoic argillaceous rock, researched Neopaleozoic very low-grade metamorphism in Northeastern Inner Mongolia by illite crystallinity index and b0 value etc. and obtained the result that Neopaleozoic main layer in this religion was late diagenetic zone and low anchizone.
     This thesis studies varied feature of clay mineral content during different diagenic-very low-grade metamorphism intensity band in the upper Paleozoic, in Northeastern Inner Mongolia, according to illite crystallinity < 0.25( epimetamorphism band )、illite crystallinity 0.25-0.42 (low anchizone) illite crystallinity>0.42 ( late diagenetic zone),discusses varied tendency of clay mineral relative content、mixed layer clay mineral ratio、clay mineral assemblage etc. respectively,and probes into genesis significance of clay mineral assemblage.
     Our research demonstrate that clay mineral of argillaceous rock in the upper Paleozoic, in this area are illite、kaolinite、smectite、chlorite、illite / smectite mixed layer、chlorite/ smectite mixed layer etc.. Clay mineral distribution present feature in different time stratigraphic unit and diagenic-very low-grade metamorphism intensity belt as follows:①In Devonian anchizone, average illite crystallinity is 0.35, illite and chlorite are dominant among these clay mineral, content of kaolinite is very low, rate mixed-layer of smectite in mixed-layer mineral (illite / smectite mixed layer and chlorite/ smectite mixed layer) is lower relatively(25%);in diagenetic zone, average illite crystallinity is 0.48, illite and chlorite are dominant among these clay mineral, but content of kaolinite is higher relatively(6%), rate mixed-layer of smectite in mixed-layer mineral is higher relatively(34%).②In Carboniferous anchizone, average illite crystallinity is 0.37, relative content of illite is 66.50%, relative content of illite / smectite mixed layer is 16.00%;in diagenetic zone, average illite crystallinity is 0.58, relative content of illite is 62.00%, relative content of illite / smectite mixed layer is 26.17%.③In Permian anchizone, average illite crystallinity is 0.31, relative content of illite is 65.84%, relative content of illite / smectite mixed layer is 8.74%, rate mixed-layer of smectite in illite / smectite mixed layer and chlorite/ smectite mixed layer is 31.67% and 23.67%,the sum of them is 55.34%; in diagenetic zone, average illite crystallinity is 0.61, relative content of illite is 56.75%, relative content of illite / smectite mixed layer is 37.00%, rate mixed-layer of smectite in illite / smectite mixed layer and chlorite/ smectite mixed layer is 28.75% and 42.50%,the sum of them is 71.25%.④In region of interest, relative content of illite is negative related with illite crystallinity, coefficient of correlation is -0.206;relative content of chlorite is negative related with illite crystallinity, coefficient of correlation is -0.170; relative content of illite / smectite mixed layer is positive related with illite crystallinity, coefficient of correlation is 0.479.⑤There are correlation among these clay mineral,presenting positive correlation are kaolinite and chlorite/ smectite mixed layer、rate of illite / smectite mixed layer、rate of chlorite/ smectite mixed layer,chlorite/ smectite mixed layer and rate of illite / smectite mixed layer、rate of chlorite/ smectite mixed layer,rate of illite / smectite mixed layer and rate of chlorite/ smectite mixed layer; presenting negative correlation are illite / smectite mixed layer and illite, kaolinite and chlorite, chlorite and illite / smectite mixed layer、chlorite/ smectite mixed layer、rate of illite / smectite mixed layer、rate of chlorite/ smectite mixed layer.
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