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内蒙中部地区晚古生代地层接触变质作用矿物转化研究
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摘要
内蒙古中部地区位于西伯利亚板块,中朝板块以及东北地块夹持的部位,在晚古生代时受华力西运动影响,本区晚古生代地层发生埋深作用而遭受变质。其中局部地层受岩浆运动的影响遭受了接触变质,发现了红柱石等特征变质矿物,并且其伊利石结晶度平均数值约在0.3-0.4之间,与同时代地层区域伊利石结晶度平均数值0.4-0.5相比明显偏低,接触变质带中侵入岩体对地层的影响范围在300-700米,一般接触带上远离岩体500-700米以后的地层的热接触变质影响基本消失,说明接触变质对内蒙晚古生代地层进行了改造但改造程度并不高。结合粘土矿物组合分析以及岩相学研究,发现受接触作用影响地层的变质程度多为浊沸石相或葡萄石—绿纤石相,并非前人一致认为的低绿片岩相,对内蒙地区晚古生代地层中可能的油气储藏并不能造成破坏。
The scope of the study area mainly Xilinguole and Xing'an League from East to western region. Xilin Gol League is located in the middle of the Mongolia—Autonomous Region,The study area is located in east longitude 115°13'-ll7°06 ', latitude 43°02'-44°52', are mainly located in Erlian Basin, Songliao basin and Hailar Basin. The study area and adjacent areas is located in the south of the great arc tectonic belt, between North China Platform and the Siberian plate Paleozoic orogenic belt in Inner Mongolia。By the North China platform, the ancient Mongolia and the Siberian plate oceanic crust at subduction multi-phase, the effects of collision and docking, Paleozoic volcanic - sedimentary rocks are widely distributed, the Late Paleozoic strata in the study area are mainly dominated by marine limestone strata and there are also a small amount of clastic rock which contain many kinds of fossils, and a great deal of biological reef; there is a progressive change that the lithostratigraphic units become younger from north to south, the strike direction is latitudinal direction or almost latitudinal direction. Late Paleozoic strata area of Mongolia is good land continental margin sediments. Inner Mongolia marine deposit is the main body of the Devonian which have a vast distribution in the north area, the area exposed strata are Paramisgurnus River Group, Hanau oboo group Taerba gete groups, such as Ingres Yam Wulashan Group . Carboniferous strata exposed mud basin, as opposed to less Shaximiao bulag, bumbat group. The lithologic character is mainly terrigenous clastic deposition under neritic facies, partial see undersea volcanic eruptions and clastic sedimentary rocks output interbedded. The important Permian strata in this area are under the EC tolgoi Al group and the philosophy of the EC group and the puerarin oboo Linxi group.
     In this paper, by the study of the measured field profile analysis, mineral composition of the research and illite crystallinity, then come to a discussion of the study area to determine the intensity of contact metamorphic reactions and the extent of, and determine the mineral into the temperature and pressure, discussed he temperature and pressure relationship between the low level of contact metamorphism and metamorphic very low-grade metamorphism. Use the typical contact metamorphic halo to identify typical metamorphic facies.According to the study on the metamorphic belt ,contact metamorphic belt and illite crystallinity to determine the intenses thermal contact metamorphism of the igneous body. Combined with previous studies, summed up the contact metamorphism degree in the central and western Inner Mongolia, and have a further study on the reconstruction of the late Paleozoic strata in the central and western regions of Inner Mongolia which caused by contact metamorphism.
     According to the degree of metamorphic rock, from the outward-looking in can be divided into three metamorphic belt: Spotted slate belt, andalusite, biotite with cordierite hornfels belt angle, the contact metamorphic belt in the most affected area 300—500 meters, there has been andalusite actinolite metamorphic minerals, etc., on behalf of low-grade metamorphism, but the metamorphic minerals from the rock in places closer to the general rock mass at a distance of 70-100 meters in the field of rock metamorphism Although there have been , But it is not clear, for example, in the sandstone of the cement, such as occurred in sericite, are very low metamorphic grade, the majority were spotted with slate and mineral characteristics are not clear, temperature about 350°in the following, which and the back we have to introduce the metamorphic minerals of the illite crystallinity and concluded that the same, this article summarizes the study area in the Late Paleozoic of the intensity of contact metamorphism, the overall in biotite - andalusite zone and spotted slate belt, the former the scope of the impact of the smaller, most of the contact metamorphic rocks are in the latter, as well as illite crystallinity provides the premise of the discussion.
     Because of the constrains of the technical means and methods , this article only study the clay mineral assemblages and illite crystallinity in order to discuss Late Paleozoic stratigraphy and development of the degree of dynamic metamorphism in Inner Mongolia. In this paper, select 0.215 and 0.40 illite crystallinity values, respectively, as the diagenetic zone, the last metamorphic belt and shallow metamorphic belt line. We select 26 samples in order to study the illite crystallinity analysis where the contact metamorphism took place ,the major samples are from late Carboniferous and Devonian, come to the illite crystallinity is 0.36 and 0.31 on average, than region on the illite crystallinity values below 0.56 and 0.41 shows that the SP Late Paleozoic magmatic activities on the West Inner Mongolia, Late Paleozoic strata have been modified. However, despite the impact of the magmatic activity, the degree of contact metamorphism zone is not high, the degree of metamorphic rock are still grapes - green stone with defibrillators. Although the measurements show that a number of sections of rock in the vicinity of the contact zone of the metamorphic minerals such as andalusite, but occurred in the overall profile or very low-grade metamorphism. Therefore, this transformation is still very limited.
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