Tectonic Geochemistry And Prediction Of Deep Ore - Prospecting In The Middle Ore Deposits In The Yangla Copper Deposit, Northwestern

angLa copper deposit which is one of the typical porphyry-skarn deposit lies in JinSha river tectonic coalcscence zone of north west YunNan.This work mainly studies the feature of orebody geologic、geochemistry of faulted structural rock and ore prediction of the li-nong ore body located the elevation 3175m of YangLa copper deposit.Then three target areas were choosed. Form what has discussed above, we obstain the following main results and cognitions:(1) Li-nong ore body was mainly preserved in Li-nong group and Jiang-bian group, controlled by stratum、rock mass and fractured shatter zones.The ore bodys are mainly located in the outer contact zone of the rock mass and the contact zone of rock mass、surrounding rock and internal contact zone are taking the second place. YangLa copper deposit have gone through three stages of mineralization at least. Summarizing the metallogenic model is "hot water deposit- magmatic hydrothermal metallogenesis- structure-hydrothermal transformation".(2) Geochemistry of element of NE tectonic fault gouge、NE structural fracture rock、 NW tectonite and not up to grade copper ore in NE fault、up to grade copper ore in NE fault of the ore body located the elevation 3175m of YangLa copper deposit shows that the element of (CaO+MgO) are rich in NE tectonic fault gouge and the other tectonite and surrounding rock are loss.And the mineralization elements are especially concentrated in copper ore located in NE fault structure. Those results shows that ore forming fluid from the deep magma chamber alter with marble and calcareous rock silk french curve when flowing by NE construction,then the Cu gathered Mg2+、Ca2+ lossed in construction center and Cu lossed Mg2+、Ca2+ lossed gathered in outside.(3) Cluster analysis shows that the microelement of sample of construction rock can be divided into rock trace elements combination、ore-forming elements association and Ni、Sr elements association (Geological significance is unknow). ore-forming elements association can be subdivided into middle-high temperature ore-forming elements combination(Cu、Bi、 In、Sn、Ag) andmiddle-high temperature ore-forming elements combination (As、Mo,Zn、 Cd、Sb、Pb). Factor analysis showed that geochemical sample can obtain the trace elements association、middle-high temperature ore-forming elements combination、middle-low temperature ore-forming elements combination and low temperature ore-forming elements combination and Sr、N、Co elements combination.(4) The A、B、C target areas were chosed in Li-nong ore body at the elevation 3175. Suggest that mine put the concentrate on those three target areas.