The Yimen The Lion Fongshan Copper Deposit Geology And Geochemistry, And Location Prediction Research, Concealed Deposits

Sponsored by the Collaboration Program of the colleges and universities of Yunnan Province of "Study on the Metallogenic Prognosis and Expanding Reserves for the deep parts and its peripheries in the Yimen Copper District" (No.2002UBBEA05B004), this thesis, " Study on the Charasteristics of Geological-geochemistry and the Locational Prognosis in the Shishan-Fengshan Copper deposit, Yimen, Yunnan ", comes out.With the study on the ore-forming geological setting, ore-deposit geochemistry (Trace elements, REE, isotopes and fluid inclusions) in Shishan-fengshan Copper deposit, it has systematically summarized the ore-forming mechanism and built the ore-forming model of the deposit. By applying the methods such as tectono-geochemistry and fuzzy comprehensive adjudgement model (FCA), key ore-finding targets have been marked.On the basis of the geological characteristics of the deposit, it sums up the ore-forming laws. And with the tectono-geochemical samples from 6 areas including No.8 ore-body, NO.59 ore-body areas, western and southern Fengshan deposit, some geochemical features of trace elements have been gained by the methods of the frequency distribution, the abnormity sections of major geochemical elements, R-factor and Q-factor analysis. The research of REE, isotopes and fluid inclusions geochemistry reveals the geochemical features of the deposit, where there existed vocano-exhalative ore-forming process. Compared with typical VMS-type and Sedex-type deposits, Shishan-Fengshan copper deposit has some similarity in the geological features, geochemical symbols (such as enriched elements, elements ratios: Co/Ni, S/Se Cu/(Zn+Pb+Cu Zn/(Pb+Zn) and Cu/Zn) and horizontal and vertical zonation. It further generalizes and presents the ore-forming model of the deposit, that is, it is a polygenetic deposit of "vocano-exhalative sedimentary — tectonic hydrothermal water reformed and deep-intruded magma superposed -underground thermal water reworked" type.Based on summarizing of the basic theory of tectono-geochemistry, it elaborates the working procedures. Fuzzy mathematics theory has been used to build the Fuzzy Comprehensive Adjudgement model (FCA) with the compiled computer program. FCA experiments have been made to the representional areas of No.59 ore-body and the 13-level tunnel of southern Fengshan deposit.With the application of the two ore-finding methods above, 23 prignosis targets have been marked. Combined with the ore-controlling factors including strata, lithologic character and favorable ore-controlling structures, 18 key targets for ore-exploration are selected. Some of them have been confirmed by exploration. It proves that the ore-finding methods are effective.