Research On The Finite Element Numerical Simulation Of The Geodynamic Evolution Features And Characteristics Of Metallogenic In Hunan Region Since Mesozoic

Hunan, is one important part of mineral area in south of China, often be called" the country of nonferrous metals", the metallogenical in this area is related to the structure sport during Mesozoic era inseparable.This paper, combined the district tectonic plate structure movement with the mechanics of partial region in mainland, combined the construct geology with geophysical data, analyzes the tectonic movement, strata, metamorphism, the geophysics characteristic of some cross sections, fossil telluric magnetic force and the deep constructions in crust, metallogenical etc., then the treatise used the method of limited number imitate to study the characteristic of main tectonic movement in Hunan region since Mesozoic era. The main result of obtaining can be induced as follows:By the way of synthesizing analyzed about the geophysics data's and based on the earthquake reflect results in crust of Hunan region, The paper made sure that: ' Jiangnan Ancient mainland' was an ancient upwarped district, gave the negative answer to the theory of that the 'Xuefeng mountainous region' was a huge napped body, pointed that there were no Albisi huge napped body in Jiangnan Ancient mainland.Clearing in meaning of that the 'Group of Baixi' was only a normal regional strata unit, included pseohyte, sandstone, slate. It was formed during the early period of Proterozoic era, can be contrasted with the other groups, which sediment in other regions during the same time, not a group of structure congestion rock.After analyzed the stress field characteristic of main structure movement in Hunan region, regarded that the structure movements was controlled by those blocks around Hunan region, such as Huabei block, India block, The Pacific Ocean block. Earlier period structure that suffer the perimeter tectonic plate constructs to the later period of make roughly with affect, The stress field characteristic of main structure movement in Hunan region were severally through variety, formed the basin as an horse's hoofs in geography.The paper concluded out a series of characteristics in Hunan region, the average velocity was 6.3 km/ s in crust of Hunan region, horizontal variety is not very obvious, it was above 8.0 km/ s in top of mantle, the low speed layeris also not very obvious in crust, the speed increased slowly with the depth, subterranean heat flow value was low, at the same time earthquake is activity, after summary the characteristics of average crust velocity construction and its geological meanings in south of China mainland. Pointed out that there was a stability continent crust. Then established a layering model of lithosphere about Hunan region preliminarily.Combination the geophysics data with detail field inspecting information about the crust construction and main structure evolve in Hunan region, studied on the dynamics mechanism of Xuefeng mountain rising and the relation between dynamics mechanism and ore field tectonic in the district. The paper put forward the theories: Xuefeng mountain rising process was constituted by those stages such as reversed add and stretch slip. The construction model of three great basins' forming was the shallow hollowing on the deep rising background. Because of gravity balance, the thicken crust of outstanding part occurrences stretch hollowing on shallow-middle crust.Using the method of limited number imitate to research on the characteristic of crust construction and the main structures evolve process in the Hunan region at first time, the paper obtained the ideal result to verify the new cognition on this research work nicely. From the emulation result of the flat surface model, it gave a cognition that Because of gravity balance the thicken crust of outstanding part occurrences stretch hollowing on shallow-middle crust. This result was agree with something on fact to match. The emulation result of the cross section model showed that Xuefeng rising, Yuanma Basin, Dongting Basin, Hengyang Basin and Xiangzhong Basin were fit together with geology fact. Especially it was in accordance with the results from the Fenghuang-Chaling cross section.Using the coupling principle about the relation between mountain making and basin forming at first time, the paper had studied mineral resources distributing regulation, given a beneficial complement to the mineral series theories in Hunan region, summary a series control characteristics among the mountain function, basin forming, mineral function...