Study On Alteration Effect Of Sedimentary Rocks In Zhaxikang—Sangrize Mining Area In Tibet

Based on the teacher "Zhaxikang mining area and the external structural alteration mapping and prospecting prediction research" and "Zhaxi Kang integrated exploration area tectonic system research" project,the ore-bearing tunnel,ore-bearing boreholes and surface rock strata of Zhaxi Kang mining area were sampled,292 surfaces,91 boreholes and 15 tunnels.The sedimentary rocks of the three and the associated lower metamorphic rocks,a total of 182,the categories can be divided into four categories are: limestone,sandstone,mudstone and slate,and its in-depth study.At the same time,we combined the magmatic rocks and related low-grade metamorphic rocks on the hydrothermal and alteration of the mining area to conduct a more comprehensive study.The samples taken in the field are processed indoors,ground flakes and sheets,and then the ground flakes and light pieces are identified and observed to understand the mineral composition of the rock.Some samples were subjected to X-ray diffraction test to obtain the mineral composition of the rock samples in the mining area,and the alteration types of the rocks were determined.Through the test and identification of the study area there are four types of sedimentary rocks.1,Slate(3 species): silicified,chloritization,silicified mica.2,Sandstone(5 species): chloritization,carbonation,silk-muscovite,silicification and biotite;.3,Limestone(6 species): chloritization,carbonation,silk-muscovite,silicification,curtain petrochemical and sub-flash petrochemical.Mudstone(Category 5): chloritization,carbonation,silicic acid,silicification and biotite.There are seven types of rocks in sedimentary rocks.Ubiquitous alteration types sericite and silicification,chloritization and carbonation are present in rocks other than limestone,and curtain petrification and sub-flash petrochemicals are only present in limestone.T By comparing the alteration between the rocks and the rocks,the alteration types of the different rock types are different.he common types of alteration sericite and silicification,chloritization and carbonation are present in rocks other than limestone.The type of alteration between the various types of rocks is different.There are five groups: 1,slate and diabase;2,sandstone and diabase;3,slate and granite porphyry;4,sandstone and rhyolite Rock;5,slate and sandstone.Each group in the same position through the same hydrothermal,by each group of two types of rock alteration type and alteration of the combination of comparison,two types of rock alteration type and alteration mineral combination has obvious difference The alteration of the rock is affected by the composition of the rock itself.Through the distribution of single relative temperature,the relative high temperature alteration mineral assemblage distribution and the distribution of rock samples developed by hydrothermal veins,nine hydrothermal active centers are circled to reflect the relatively strong hydrothermal activity.The relationship between the distribution of the ore-bearing hydrothermal fluid and the location of the hydrothermal center at the surface and the direction of the next prospecting are specified to some extent.