藏南扎西康礦集區(qū)地下結(jié)構(gòu)與成礦模式探討
[Abstract]:During the docking collision between the Indian continent and the Eurasian continent, a series of metamorphic core complex dome was formed by large-scale interaction of crust-mantle materials, which also led to large-scale mineralization. The Zaxi-Kang polymetallic ore concentration area was formed in this background. For the ore-controlling factors, the ore-prospecting model has been studied and accumulated. Many aspects of geological information show that the formation of the Zaxikang deposit is closely related to the Thona Cave nuclear complex in the area, and the distance between the two is relatively long, and the surface position is relatively independent. It is necessary to excavate its deep connection. However, the degree of geophysical work in this area is low due to natural environment conditions, and many geological understandings lack the support of geophysical data. Based on magnetotelluric (MT) inversion results and gravity and magnetic 3D data of large scale (1: 50, 000), this study reveals in detail the morphological characteristics of the rock mass in the staggered cavity (the undulating shape of the rock body top surface, the depth of the rock mass, and the depth of the rock mass). The extension and lateral potential) and the tectonic framework of the mining area provide geophysical evidence for the study of the metallogenic model of the Zaxi-Kang polymetallic ore concentration area by synthetically studying the characteristics of the deep underground structure of the area. (MT) inversion of apparent resistivity profile and gravity 3D inversion data from magnetotelluric data show that there is a concealed dome structure in the depth of about 4km under Zaxikang, and the whole dome shows high apparent resistivity. Low density and weak negative magnetic geophysical field response. The magnetotelluric data (MT) show that there is no connection between the concealed dome structure inferred under the mining area and the dislocation cavern core complex, and the resistivity response of sedimentary strata such as low resistivity slate, sandstone, shale, etc. The gravity and magnetic inversion data show that the southern Sinahole nuclear complex inclines to the north, goes deeper into the underground 10km, and its shallow density distribution is uneven, indicating that it has undergone multiple periods of invasion and uneven alteration, corresponding to its complex and multivariate lithology and structural characteristics. The intrusive interface of the concealed fornix beneath Zaxikang is "S" type concave and convex, indicating that there may be intrusive rock branches in the mining area, and the characteristics of low density between the two low-density anomaly bodies are presented. The result of MT inversion and the tectonic evolution of the study area are synthesized. According to the petrophysical data, the zonal low density anomaly is an underground fractured structural zone, which is not the manifestation of the material connection between the two dome structures. The geophysical results of this study reveal the underground structure of the mining area and the southern area of the Dana Cave nuclear complex, focusing on the structural characteristics of the underground dome, filling up the gap of geophysical data in the study area, and providing certain information on the deep structure of the area. Including the scale, shape and interaction with ore deposits and other fornix structures in the study area, which supports the view that mineralization in Zaxikang area is deeply influenced by fornix, and develops 3D modeling for mining area. The deep prospecting provides basic data.
【學位授予單位】:成都理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:P612
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