| The lead-zinc polymetallic deposit of the Shaliuhe area is located on the eastern edge of the Caledonian trough fold belt in the northern margin of the Qaidam Basin.It is connected to the Songpan-Ganxi Indosian trough fold belt in the east and adjacent to the northern slope of Burhanbudda in the south,with an area of 607 km2.It is the Seyton Mountain-Alzto Mountain Caledonian,Indosinian lead,zinc,gold,tungsten,tin(copper,cobalt rare earth)metallogenic belt(Grade III),Shaliu River The lead-zinc polymetallic ore field in the Shaliu Henan area of the Caledonian gold,tin,tungsten(copper,cobalt)metallogenic sub-belt(Grade IV)(Grade V,Qinghai Province,2005;Ma Guodong,etc.2014).The minerals in the area are mainly polymetallic,followed by ferrous metals and non-metals.The genetic types include contact metasomatism,hydrothermal type,filling and metamorphic type,and regional metamorphism.Metal and non-metallic ore(bed)points are found in the area.There are 16 places,including 2 deposits and 14 ore points,and the ore-forming geological conditions are superior.The lead-zinc polymetallic deposit in the Shaliu Henan area is one of the important typical deposits in the region.Through the collection and collation of regional ore-forming geological background data,the ore-forming geological characteristics of the study area were further summarized and analyzed,and the genesis of the deposit was determined.The geophysical and geochemical information in the mining area was combined with the geochemical and geochemical information in the mining area.Mineralization prediction research.In the mining area,the exposed layer is the lower part of the upper part of the Lower Paleozoic Daken Datun(rock)group gneiss group(Pt1dk1).It is a set of metamorphic rocks with gneiss and marble and slanted longhorn flash schist.It is distributed in the east-west direction and tends to be a monoclinic structure in the north.The middle section of the mining area is a set of calcareous and medium-basic volcanic eruptions and sprinkling deposits.The lead and zinc mineralization elements are higher,which are 1.5 and 2.0 times of the abundance of the crust.It is analyzed that the stratum(skarn)provides a material source for the formation of lead-zinc ore(Ma Guodong et al.,2014).Metallogenesis is related to east-west faults.At present,most of the ore bodies occur in the second-order faults between F2 and F3.According to statistics,they account for 58%.The ore body is mainly produced in the outer contact zone of the ore-forming rock mass.It has multi-stage and multi-stage mineralization characteristics and is distributed along a certain stratum layer.The occurrence is mostly consistent with the stratum,and some ore bodies are formed and the strata are formed.The obvious inconsistency indicates that the mineralization is not only related to skarn,but also more closely related to the skarn contact zone.The types of wall rock alterations are mainly skarn,silicification,chlorite,flash petrochemical(the same as twilight and petrochemical),carbonation and sericitization(Zhang Wei et al.,2017);There are Yunying lithification,fluorite and petrochemical,curtain petrochemical(slanted curtain stone and epidote)and Fushan Petrochemical;rare silicon fume,black mica,kaolin,serpentine,hornblende and grape petr(Zhang Wei Wait,2017).The Indosinian monzonitic granite in the mining area invaded the gneiss group of the Daken Datun(rock)group in the Lower Proterozoic,and belongs to the S-type granite of magmatism.The black cloud and long granite in the mining area has similarities with the domestic and foreign tungsten-tin ore-forming rock mass in terms of rock,petrochemistry,material composition and formation time,especially the W and Sn-containing ore-forming elements are high.The average value of the world's granite is 1.5-2.1 times,which is a favorable ore-forming parent rock,which provides a material source for W and Sn mineralization(Ma Guodong et al.,2014).Through the high-precision magnetic method,the intermediate gradient resistivity method,and the quantitative and comprehensive quantitative analysis of the induced polarization,five categories of abnormal regions are divided into the study area.The five anomalous areas circled are related to the mineralization of underground ore bodies,veins and rock formations.The underground ore bodies and veins are generally distributed in thin strips,or may be caused by lenticular or multi-layer thin-plate magnetic veins.The study area was measured by 1:5 thousand geochemical exploration(soil),and 23 kinds of geochemical anomalies were circled,including 6 Cu anomalies,7 Pb anomalies,2 Zn anomalies,5 W anomalies,and 1 abnormal Sn.Ag is abnormal 1 place.The anomalies are mainly distributed in the distribution section of the ore-bearing strata in the Zhongyan section(Pt1dk1b),and some are in the vicinity of the contact zone or fault of the rock mass and the stratum.More clusters appear,generally in the near-east-west distribution,some overlap with magnetic and electrical anomalies,abnormal concentration bands and component zoning are not obvious,the scale is generally small.Based on the geological materials,geochemical exploration results and discovered metallogenic facts in the area,two ore-forming prediction areas(I,II)with favorable mineralization are delineated in the pre-examination area,indicating the next prospecting work. |
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