Geochemical Characteristics And Exploration Indicators Of Jidong Gold Metalogeny

Jidong gold metalogeny is an important part of the gold metallogenic belt in thenortheast in our country, especially in the metallogenic geologic condition is superior,rich resources, and produce large amount of gold is famous throughout the country.This area is located in the north China platform in east section of yanshan stage fold,in the open country layer including the Precambrian, the late Cambrian andPhanerozoic Eonothem, metamorphic rocks are widely distributed in the area. Areastrong magmatic activities, especially in indosinian, yanshanian magmaticemplacement magmatic activity is the strongest, under the effect of this, the parts inthe construction of the advantageous ore-bearing hydrothermal and specific layerformed numerous gold deposits.Yanshan period granite is of great significance to the formation of gold oredeposits, the author study granite for ore concentration area for analysis from the rockchronology, geochemistry.The diagenetic age by U-Pb zircon dating of rock mass isearly Yanshan; through the analysis of trace elements and rare earthelements onthe determination of rock, Jidong province is crustal melting of post collisiontectonic environment of high potassium calc alkaline series rocks. Intrusion ofMesozoic granite, on the one hand, provides directly the sources of gold, on the otherhand, magmatic hydrothermal provide heat activation of gold. Therefore, has animportant significance in early Yanshan granitoid of gold mineralization.Jidong typical gold deposits-gold factory located gold3series of gold phaseanalysis the occurrence of rich ore section, the analysis result is: the gold occurrencein the amphibolite plagioclase phase behavior of the proportion of active state54.75~56.87%and43.1345.25%of Portland state; In the alteration amphibolite plagioclasefor active state in the percentage of31.86~36.05%,63.9568.14%of Portland state;In the mineral for active state in the percentage of91.72%,8.28%Portland state.Phase content with lithologic alternation rule by the occurrence of gold metallogenicmodel of gold: the amphibolite plagioclase magmatic hydrothermal and surroundingrock interaction, the available gold quenching, alteration in the amphibolite plagioclase, finally are rich in magmatic hydrothermal gold element due to themigration of environmental change and ductile shear tectonic fissures in theenrichment of precipitation formation of gold deposit.For ore concentration area1:200000regional geochemical data processing,abnormal circle deposit area. To further explain abnormal evaluation, this article49pieces collected in jidong ore concentration area stream sediment samples, sampleanalysis of cicc phase.According to the elements delineate the abnormalarea, determine the ore-formingscope in the abnormal area, was evaluatedusing phase in the stream sediment Au. In the abnormal area, abnormal Au within themining area, abnormal mining in sulfide and free the proportion increased gradually,the occurrence phase content of gold in use can be further delineating metallogenictarget area.In Jidong gold metalogeny1:200000regional geochemical data of factor analysis, combination of Au-Bi, draw the factor score contour map, in areas ofhigh factor score isopleth of jidong area of ore concentration area distribution;On the Jin Changyu gold deposits and Yu Erya gold deposits related elementsfor correlation analysis. Comprehensive research to get Jin Changyu gold deposits combination type gold deposits are a typical elements: Au-Ag-Pb-Bi-Te; YuErya gold deposits are typical elements combination types: Au-Ag-Cu-Pb-Te.