| The geotectonic location of northeast Yunnan is located in the two quaternary tectonic units,the Kangdian basement fault uplift zone of the upper Yangtze landmass and the carbonate platform of the southern Yangtze landmass.Yangtze massif is the southwest margin of the Sichuan and Yunnan-Guizhou lead-zinc polymetallic metallogenic domain is an important part of,in jiang deep fracture in northeast depression basin in southern Yunnan,on the east side show in SN to jiang deep fault belt,NW to Ziyun-the same deep fault belt and NE to maitreya-division of deep fault zone formed by the"triangle",adjacent to the longmen mountain orogenic belt,hyperplasia of the Nanpan river-Youjiang arc rushed fold belt and the Ailaoshan sumie green in the spring of orogenic belt,due to multi-stage tectonic superposition compound issue more intense,complex geological environment variable and metallogenic dynamics mechanism,metallogenic geologic condition is superior,It has not only formed the unique germany-rich lead-zinc polymetallic ore concentration area in China,but also created the world's rare super large-super large germany-rich silver-lead-zinc polymetallic ore deposit,which is typical in the Sichuan-Yunnan-Guizhou lead-zinc polymetallic metallogenic area.This paper based on the predecessors'achievements of geological data of the induction,analogy,especially to the implementation of institute of geological survey and mineral project in recent years the re-recognition of the result data,fully tap to extract the useful information for mineral and combined with field investigation of typical ore deposits,the related system analysis of a sample,this paper expounds the premises le ma metallogenic regularity,lead and zinc and silver mineralization and prospecting model is established,a preliminary delineated the favorable targets for hydrocarbon prospecting,for current and future prospecting direction are pointed out.Hope in the study area of 1:50 000 mineral geological special investigation,fully collecting predecessors'research results,combined with the typical ore deposit analogy research,by focusing on recourse,to determine the lead and zinc silver ore formation of sinian system in the area?Z2dn?series of the group,devonian system middle qujing group?D2q?,lithologic built for dolomite,surround its alteration and typical Huodehong lead-zinc mine,and he rent lead-zinc mine are similar,carbonatization and silicification,pyritization alteration;The lead-zinc-silver deposit is located in the ore-bearing strata in the flank of the nne and nw faults.According to the production characteristics of regional lead-zinc deposits,the lead-zinc deposits in the study area are controlled by strata,lithology,lithofacies and structure,and the minerals are distributed in the broken belt between dolomite strata of ore-bearing strata,and the ore bodies are produced in the same or steep dip as the strata.Based on the summarization of the regional metallogenic regularity,the metallogenic regularity of the Pb-Zn-Ag deposits is preliminarily summarized.It is concluded that the formation of lead,zinc and silver ore is closely related to strata,structure,lithology and rock facies,which is the result of the interaction of various ore-forming factors.The main minerals in the study area are Pb-Zn-Ag.The producing strata of the lead-zinc-silver ore are consistent with the region,and are in good agreement with geochemical anomalies.According to its location and characteristics,it can be divided into three Pb-Zn-Ag ore belts,namely the western area of Weigu anticline,the central area of Longtoushan anticline,the Lemachang fault zone and the eastern area of Huodehong.According to previous research results,combine the work achievements and realize comprehensive analysis,in the hope of preliminary circle within the scope of lead and zinc ore prospect four,namely Weigu Pb-Zn-Ag-Cu prospecting prospect areas,Lemachang Ag-Pb-Zn prospecting prospect areas,Huodehong Pb-Zn and coal prospecting prospect area,Lehong Pb-Zn prospecting prospect area???,divided into Pb-Zn-Cu-Ag prospecting target area two,target areas for class B.Namely Jiangjiawan lead-zinc-silver prospecting target area?Class B?and Caojiadu-Wenjiaping silver-copper polymetallic prospecting target area?Class B?.The ore prospecting potential analysis and metallogenic prediction of typical deposits?spots?in the study area indicate that the deep part of the lead-zinc-silver deposit concentration area in lemachang has a great prospecting potential and has the basic conditions to search for medium-large deposits.In the shallow part,the main prospecting direction and main exploration type are indicated,which are mainly for the hydrothermal type and steep vein type faults of tectonic altered fractured rocks,and for the deep part for the middle-low temperature hydrothermal type and sedimentation-transformation stratabound deposits. |
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