Discussion On Geolgical Characteristics And Prospecting Direction Of Tayuan Copper Polymetalic Depotsit In Heilongjiang Province

The research district is in Tayuan, a town in the Daxing`anling Area Ridge inHeilongjiang Province. This district is located in the Daxinganling volcanic belt ofsouthern Ergun of the folded region of Xing’an-Inner Mongolia geosynclines in thegeo-tectonic position, and belongs to Au、Ag、Cu、Mo、Pb、Zn metallogenic belt ofthe late Paleozoic and Mesozoic of the Derbugan, which presents a very goodore-forming geological conditions. The strata exposed in the region mainly includeJixianggou and Dawangzi Groups’ the weakly metamorphic rocks ofNeoproterozoic-Lower Cambrian, Xinyigehe Group’s the weakly metamorphic rockseries of Paleozoic, Baiyingaolao and Longjiang Groups’ Acidic Volcanic Rock ofMesozoic.The geo-tectonic distributes in an E-W direction with volcanic institutionsdevelopment, and it is accompanied by E-W direction fold formation, compressivefault and extrusion Mylonization’s compressive structural plane, which all togethercompose a complex E-W structural belt. There is strong magma activity in theresearch district, and the magma is mainly composed with granodioritic porphyry oflate middle Yanshanian period which has close relationship with the mineralization.The study area is divided artificially in three adjacent deposits/exploration areas,namely the Tayuan Au-Ag-Cu Deposit, the two branch line Pb-Zn Deposit, and theXiajiale River Pb-Zn Deposit. The ore-forming elements are complicated, in whichMo、Au、Ag、Cu、Pb and Zn could be symbiotic, associated or forming industrial orebody independently. There are also various types of wall-rock alterations, amongwhich silication, sericitization, greisenization, sericitization, skarnized, chloritization,epidotization and so on are closely connected with mineralization. Although much work has been done previously, they are limited to the dispersedand small area without overall, systematic and thoroughgoing researches. Based onthe previous data system analysis and the practice of prospecting, the writer found thatthe research in mineralization and wall-rock alteration etc. all have show thedistribution regularity, that is, from the east of Mo point of Keduodi river to theTayuan Au-Ag-Cu area, the two branch line Pb-Zn area, Abnormal elements show thatthe zoning of (Mo)-Au, Ag, Cu-Ag, Pb, Zn (, Cu); from the north of Mo point ofKeduodi river to the Tayuan Au-Ag-Cu area, the Xiajiale River Pb-Zn area, abnormalelements show that the zoning of （Mo）—Au, Ag, Cu—Ag, Pb, Zn（、Cu）. Eachanomaly of the element can form a corresponding ore body, thus formed thecorresponding ore bodies zoning. Likewise, wall-rock altered in order intoK-feldsparization-greisenization belt, sericitization-silication belt, chloritization,epidotization and they showed obvious zonation.This kind of cloth of corresponding exhibition mineralization and altered pointswith regularity reflect the integrity of the mineralization of three ore districts, and theybelong to the same mineralization of the ore-forming under different physical andchemical conditions. Through metallogenic series research of the typical porphyrycopper deposit, compared to the same metallogenic belt fork porphyry depositcharacteristic analysis, combined with the isotope and ore-forming fluid tracerresearch conclusion, the establishment of the innovation of the source area towerporphyry-shallow into hydrothermal polymetallic ore deposit metallogenic seriesmodel, that is, to study the overall area of southwest ko much emperor rivermolybdenum point as center, molybdenum porphyry copper, the outcrop,hydrothermal activity spread from the region to outside with migration andpenetration, in order to form the Au, Ag, Cu medium temperature (low temperature)ore deposits in the hot liquid pulse shape pb-zn deposit. Together with thecorresponding alteration, it perfectly explains the regularity of mineralization andwall-rock alteration.Taking advantage of metallogenic series model, and according to themetallogenic series absence theory, this article discusses a possible porphyry deposit in the research area, and points out that southwest of the study area of Keduodi RiverMo have possible porphyry deposit, and get evidence from the previous work. Inaddition, according to the model of metallogenic series, it evaluates prospectingdirection of the Tayuan Au-Ag-Cu deposit, the two branch line Pb-Zn deposit, that isthe Tayuan Au-Ag-Cu deposit to the south tower copper fell, should along thedirection inquires ore body deep; there are four comprehensive chemical synthesistarget areas in the Two Regional Areas; and there are two comprehensive geologicaland geophysical target areas in the Xiajiale river region.