| The investigation area of Xiongmei Town,Shenzha County,Tibet is located in the Bangong-Nujiang suture zone in the hinterland of the northern Tibetan Plateau,between the Qiangtang and Lhasa terranes.The stratum belongs to the Gangdese-Tengchong stratum area of the Yunnan-Tibet area and the Bangong-Nijiang stratigraphic area.The structural traces in the area are completely controlled by the evolution of the bond zone.The Yongzhu ophiolite exposed in the investigation area is a small part of the middle of the Shiquanhe-Yongzhu-Jiaoli ophiolite belt in the southern branch of the Bangong suture zone.The geological structure of the investigation area is disorderly and the mineral reserves are large.The area belongs to the Bango copper polymetallic ore-forming prediction area in the Bang-Nu metallogenic belt,and the Gangdese-Tibet-nan metallogenic belt in the south.The ore-forming conditions are extremely favorable.At present,9 mineral deposits have been discovered in the area,including2 gold mines,4 copper mines,1 chromite ore,1 gold-copper mine,and 1 copper-molybdenum deposit.The minerals in the area are mainly controlled by the Cretaceous medium-acidic intrusive rocks and the NW-trending structure,mainly distributed in the Paleozoic faulted area and the Mesozoic basin.The rock types include porphyrite,granodiorite,and plaque-like granite.The surrounding rocks are mainly Cretaceous strata,and the lithology is carbonate and clastic rocks.In accordance with the relevant codes and technical requirements of 1:50,000 regional geological survey and geochemical census,the survey area shall be conducted on the basis of systematic collection and comprehensive analysis of existing geological data.Field sampling50000 stream sediment geochemical survey,give priority to with stream sediment survey method,the basic sampling density of 4-6 PM/km~2,sampling area of 735 km~2,according to the specification requirements of soil and rock samples collection and processing,through physical workload statistics,complete the stream sediment sampling area of 708 km~2,sample order 3014,a total of 91 repeated samples,accounting for 3%of the total number of sampling,actual samples density of 4.25/km~2(point),sample processing and the number of 1:50000stream sediment work requirements.Analysis on sample selection test Cu,Pb,Zn,Au,Ag,As,Sb,Hg,Bi,W,Mo,Sn,Cr,Co,Ni,Mn,Ti,etc,a total of 16 kinds of element content and distribution characteristics of geochemical anomalies to outline and system to find out the geochemical background,mineralization for delineating favorable location,using the large scale,physical,chemical,remote,cooperate with the surface engineering,to carry out the system of mineral examination,put forward for further prospecting target areas and new mines,to carry out the important geochemical anomalies and evaluation,find out the causes of abnormal initial,provide information for geological prospecting.Through comprehensive research,regional metallogenic rules and ore control conditions were summarized,ore prospecting indicators were extracted,ore prospecting target areas were optimized,and the resource potential of the selected area was generally evaluated.The sample analysis test results reflect the polymetallic gold-bearing beaded anomaly zone along the contact zone in the measurement zone.The coarse-grained porphyritic granite is a combination of W,Sn,Bi,Mo and Mn high temperature elemental combinations.The body is abnormal for Sb,Bi,and Welements,and the combination of Au,Cu,Pb,Bi,and Hg elements is abnormal.Through the analysis of the geological background,distribution range and abnormal intensity of the geochemical anomaly area,according to the results of field mineral geological mapping,20 anomalies were determined to be mine-induced anomalies.The abnormality was graded in 2 types of abnormalities in Class 2,6 in Class B,and 12 in Grade 3.According to the similar geological conditions,such as stratum and structure,combined with the combination of anomalous elements,the minerals causing anomalies in the survey area are divided into 2 categories and 7 subcategories.Through field investigation,four new mineralization points were discovered,mainly iron ore.Among them,a mineral body was found in the Karonqu iron deposit,which was produced in the marble of the Riola Formation.The ore body consists of 5 Nearly parallel production of small ore bodies,the ore body up to1.5m wide,up to hundreds of meters.The ore contains hematite,mirror iron ore,limonite,and the results of the block analysis show that the TFe content is as high as 63.56%,which has good prospecting significance. |
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