Geological Characteristics And Metallogenic Model Of The Kaerqueka Copper Deposit In Geermu,Qinghai Province

Kaerqueka copper ore deposit located in Qimantege Metallogenic Belt of East Kunlun,Qinghai Province.It is the largest and most typical in these deposits which were discoveried by this area in recent years.This paper will discussing the genetic types and metallogenic model of Kaerqueka deposits from geological features,distribution of elements and geochemistry aspects.Metamorphic rockes of the Jinshuikou and Tanjianshan,and many acidic magmatic rocks of the indosinian,and many NWW-NE fractures developed in Kaerqueka copper mine.The ore body is controlled by granodiorite porphyry,and magmatic rocks and marbles contact area,and the fractures.Research on geochemical characteristics of the magmatic rocks which were relate to ore-forming,it show that are high-potassium calc-alkaline series;Analysis on the REE and trace elements,we can find ?REEgranodiorite porphyr>?REE porphyritic granite>?REEgranodiorite.The type of three magmatic rocks all have weak negative anomaly of 8Eu,and the abnormal strength in turn weaken.The granodiorite porphyry have weak positive anomalies of ?Ce,but the porphyritic granite and granodiorite have weak negative anomaly of ?Ce.The homogenization temperatures of the fluid inclusions in the skarn-type ore and in the porphyry-type mineralization granodiorite separately vary from 170 to 260? and 300 to 440?.The fluid inclusions in Kaerqueka have high salinities and high densities.The Ore-forming fluids Containing mainly H2O-CO2-NaCl-CH4-N2,and more hydrocarbons,is with magmatic fluid characteristics.Sulfur and lead isotope show that sulfur and lead of Kaerqueka most from magma,meanwhile small portion came from Crust and Tanjinshan Group formation.Hydrogen and oxygen isotopes show that ore-forming fluid related with the precipitation,and the precipitation occurs with rock hydrothermal mineralization exchange developed into the area's Ore-forming hydrothermal water.Combined with tectonic setting,the age of ore-forming and rock forming,we considered various metallogenic types and mineralizing associations of Kaerqueka copper-polymetallic ore deposit were in the same tectonic-magmaatic product of Indosinian,only owing to mineralization in different stages,different depth and different positions.In the end summarizes the metallogenic model of Kaerqueka copper-polymetallic ore depositComprehensive geological and geochemical characteristics of the analysis of data that Kaerqueka copper deposits is a porphyry deposits,namely porphyry intrusions center,skarn deposits occur in the peripheral and overlying sedimentary deposits the epithermal deposits in porphyry metallogenic system composed.