西准包古图呼的合铜矿地质特征、成因及成矿规律研究

GEOLOGICAL CHARACTERISTICORIGIN AND MINERALIZATION REGULATION RESEARCH OF HUDELE PRORPHGRY COPPER DEPESIT IN BAOGUTU AREA,WESTERN JUNGYAR

新疆西准包古图矿区呼的合铜矿位于巴尔喀什华力西期斑岩成矿带.大地构造位置属哈萨克斯坦-准噶尔板块,唐巴勒-卡拉麦里古生代复合沟孤带,包古图岛弧区.矿床处于达尔布特和克乌深大断裂间,次级NS向与NE向断裂交汇处.Ⅴ号岩体属深源、浅成中酸性复合相岩体.含矿岩石以中粗粒、斑状、似斑状结构的石英闪长岩、花岗闪长斑岩为主,次有花岗闪长岩、花岗斑岩、黑云母花岗闪长岩等,形成时间为320~300 Ma,岩石蚀变强烈,蚀变分带自岩体中心向外构成钾长石和粒状石英核-钾化带-绢英化带-青盤岩化带.金属矿物组合自岩体中心向外变化规律为：（黄铁矿-辉钼矿-黄铜矿）→（黄铁矿-黄铜矿-闪锌矿-辉钼矿）→（黄铁矿-黄铜矿-毒砂-Te-Bi-Ag-Au的矿物）.有益元素主要为铜、钼、金、银等元素,矿石类型自岩体中心向外的变化规律为：Mo（Cu）→Cu（Mo）→Cu（Au）→Au.矿石构造为细粒浸染状和细脉浸染状.矿石品位低、矿化均匀,成矿物质主要来自与其共生的岩浆岩,属典型斑岩型铜矿.构造、岩石、蚀变、矿物、及成矿元素在空间、时间上变化规律较强,与矿化富集有密切联系.

The Hudehe Porphyry Copper Deposit locates in the Baerkashi porphyry mineralization belt,which is in Baogutu area,West Junggar Basin Xinjiang.The geotectonic position is located in Bagutu arc,Tangbala_Kalamaile Paleozoic composite trench-arc system of Kazakhstan-Junggar plate.It occurres at the cross position of the NE-NS secondary faults,between the Daerbuti and Kewu deep faults.The No.Ⅴ rock body is composite intermediate-acid hypabyssal rock which from the deep.The ore bearing rocks are composed of mid-coarse grained porphyritic quartz-diorite,granodiorite porphyry mainly,and granodiorite,granite porphyry,biotite granodiorite etc.secondly.The age of the rock is about 300-320Ma.The strong alteration of the rock body shows K-feldspar granular quartz zone →K-silicate zone→quartz-sericite zone→propylitic zone from inner outwards.The metallic mineral assemblage also shows（pyrite-molybdenite-chalcopyrite）→（pyrite-chalcopyrite-sphalerite-molybdenite）→（pyrite-chalcopyrite-arsenopyrite –Te-Bi-Ag-Au minerals） from inner outwards.The main types of ore are fine-grained disseminated ore and veinlet-disseminated ore.The characteristics of the ore are low grade,homogeneous mineralization,the main minerals from the paragenetic magma,typical porphyry copper deposit.The deposit shows typical changing mineralization regulation of the constitution,rock type,alteration,minerals and elements of mineralization in the space age,and also is related with the minerals concentration.