Metallogenic Geological Background And Prospecting Direction Of Polymetallic Deposits In Zhagawusu Area,Inner Mongolia

The working area is located in central Inner Mongolia,a favorable area for polymetallic mineralization.In this paper,the temporal and spatial distribution characteristics of mineral resources in the working area are comprehensively viewed,the characteristics of deposits?points?in the whole area are analyzed with examples,the metallogenic geological background is summarized,the abnormal ore-causing information is extracted,the ore prospecting model is established,and the ore prospecting signs and directions of polymetallic ores are discussed.The conclusions are as follows:?1?Generally speaking,the distribution of minerals in the work area can be divided into three metallogenic belts in space,mainly including gold,iron,copper,chromite and magnesite.?2?The deposits?orenodes?in the working area can be divided into four types according to their genesis:magmatic hydrothermal deposits?orenodes?,magmatic deposits?orenodes?related to magnesic ultrabasic rocks,Marine volcanic hydrothermal deposits?orenodes?and weathering eluvial deposits?points?.?3?The metallogenesis of polymetallic deposits in the area can be divided into two periods:Paleozoic metallogenic period and Mesozoic metallogenic period.?4?The ore-forming geological background is summarized as follows:the enrichment of polymetallic elements in baoyintu group?Pt₁B.?,ailegemiao group?Pt₃al?and benbatu group?C₂bb?.The formation of magnesite is related to the siliceous weathering crust of ultrabasic rocks.Fault structure controls mineral distribution in this area.The magmatic activity is related to the distribution of magmatic hydrothermal deposit?orenodes?.?5?The ore-causing information in the extracted area is as follows:the favorable ore-forming strata in the area are mainly the baoyintu group?Pt₁B.?,ailegemiao group?Pt₃al?and benbatu group?C₂bb?,and the regional fault structure controls the basic structural pattern and mineral distribution in the work area.Magmatic activity plays an important role in the formation of Fe-Cu-Au polymetallic deposits.?6?It is concluded that the ore prospecting models of the deposits?orenodes?with different genetic types in this area are as follows:the polymetallic soil geochemical anomaly area and the fault tectonic superposition area are favorable areas for searching magmatic hydrothermal polymetallic deposits.The distribution of magmatic deposits is mainly related to ultrabasic rocks.The Marine volcanic hydrothermal deposit?orenodes?is directly marked by the surface iron cap,and the geochemical anomaly of soil?debris?indicates the distribution of Marine volcanic hydrothermal deposit?orenode?.The weathering and eluvial deposits?orenodes?often appear in structural Spaces such as ultramafic faults or fractures.?7?A preliminary summary of the ore-prospecting criteria in the working area is as follows:the intermediate-acidic--intermediate-basic magmatic activity area is an important location for ore-prospecting.Ultrabasic blocks are an important indicator for the search for chromite and magnesite.The polymetallic geochemical anomaly concentration center is an important location for ore prospecting.The ultrabasic blocks were delineated by high-precision magnetic survey,and the deep extension trend of the polymetallic mineralized zone was indicated by the 1:10,000 IP ladder survey.Remote sensing interpretation shows the distribution of mineralization and alteration on the whole and the distribution of ultrabasic blocks in the working area,which is a good indicator for ore prospecting.