A Study Of Structural Ore-controlling Characteristics Between ShuiTou Fluorite Deposit And ManSaZiGou Fluorite Deposit In Linxi Region, Inner Mongolia

Linxi County locates in the superposition and transformation area of Paleozoic Paleo-Asian tectonic met allogenic province and Bin-Pacific tectonic met allogenic province, tectonic position mainly experienced the stages of development: the formation of continental basement, the proliferation of Paleoasian margin and the Bin-Pacific continental margin activities, which makes extremely favorable conditions for the region mineralization; fluorite mines mainly formed in the Variscan and Yanshan period, of which the yanshan period with the characteristics of Multi-stage superimposed mineralization is the strongest. Late Paleozoic- Mesozoic volcanic- sedimentary rocks and Mesozoic granites is the main host rock in the field of research, deposits are mainly formed in the NE-NNE and EW-trending tectonic faults.ShuiTou area- HanBaoZi fault zone and ManSaZi ditch-three sub-camp fault zone is SN and NNE. In this paper, typical fluorite deposit such as ShuiTou fluorite mine and ManSaZi ditch fluorite mine with two belts as the research object, According to the field geological investigation, references and laboratory analysis, systematically compared the Ore-controlling structure mechanical properties and deformation characteristics ot the two fluorite deposits, Mine(of) veins, ore fabric, mineral assemblages, vertical variation characteristic of wall rock alteration and structure- the mutiperiodic multi-stage mineralization characteristics, summarized the tectonic ore-controlling characteristics of different fault zones, achieved the following understanding:1.The early and late YanShan period in the study area were squeezed by the direction along with EW and NNE-SSW, respectively. Hydrothermal ore-forming period was the transition period of EW compressive stress to NNE-SSW compressive stress. Due to the regional structural heterogeneity, structural ore-control characteristic of ShuiTou fluorite mine is tenso-shear property in the early stage and main stage, compresso-shear in the late stage. However, ManSaZi ditch fluorite mine is compresso-shear in the early stage and main stage, tenso-shear property in the late stage.2.Due to the different structural ore-control characteristic in different mineralization stage of ShuiTou fluorite mine and ManSaZi ditch fluorite mine, the shape of ore bodies, mineral composition, ore texture and structure, surrounding rocks alteration differ in the vertical variation.3.The mineralization period of ShuiTou fluorite mine and ManSaZi ditch fluorite mine are divided into three phases: the early stages of mineralization(Fluorite- quartz stage), the main mineralization stage(Quartz- fluorite phase) and the late stage of mineralization(Carbonate stage).