發(fā)布時(shí)間：2018-12-14 02:42

【摘要】：460金礦床地處西伯利亞板塊與哈薩克斯坦板塊碰撞形成的板塊縫合線上,緊鄰紅石山-黑鷹山地體。礦區(qū)出露地層主要為下石炭統(tǒng)的白山組中酸性變質(zhì)火山巖及碎屑沉積巖建造;礦區(qū)構(gòu)造以近NW向斷裂為主,是礦區(qū)的主要控礦容礦構(gòu)造;礦區(qū)巖漿巖主要為花崗閃長巖,多呈巖基、巖株?duì)町a(chǎn)出。礦體主要賦存于花崗閃長巖的斷裂或節(jié)理裂隙中,受近EW向和NE向斷裂控制;礦石以石英脈型為主,礦石礦物主要包括黃鐵礦、黃銅礦、輝銅礦等,脈石礦物主要有石英、長石、綠泥石、絹云母等,金多以碲化物的形式存在,主要有斜方碲金礦和針碲金銀礦;礦石結(jié)構(gòu)主要有半自形-他形晶粒狀結(jié)構(gòu)、填隙結(jié)構(gòu)、交代網(wǎng)狀結(jié)構(gòu)等。礦石的構(gòu)造主要為細(xì)脈-網(wǎng)脈狀,另有條帶狀、團(tuán)塊狀等。圍巖蝕變以絹云母化、綠泥石化、綠簾石化、碳酸鹽化等低溫蝕變?yōu)橹?成礦階段從早到晚劃分為石英-黃鐵礦階段、石英-多金屬硫化物階段和石英-碳酸鹽階段。各成礦階段脈石礦物(石英、方解石)中均發(fā)育有流體包裹體。包裹體的類型包括富液相Na Cl-H2O型包裹體(W型)和含子礦物流體包裹體(S型)。以橢圓狀、似圓狀和不規(guī)則狀居多,次為負(fù)晶形等。包裹體大小多數(shù)集中在5~15μm之間,且包裹體的氣液相比例變化于10%~30%。從早到晚流體包裹體完全均一溫度分別為202.4~348.3℃,135.9~282.1℃和104.8~165.8℃,鹽度分別為1.4%~10.98%Na Cl.eqv,2.07%~13.51%Na Cl.eqv和0.35%~8.14%Na Cl.eqv,成礦流體總體顯示低溫、低鹽度為特征。成礦環(huán)境屬淺成環(huán)境。H、O同位素表明,成礦流體并非單一來源,具有巖漿水與大氣降水混合的特征。流體的混合作用是Au、Te等成礦元素沉淀的主要原因。本文通過鋯石U-Pb年齡獲得460巖體的成巖年齡在340~341Ma。根據(jù)區(qū)域上金礦床的形成年齡與巖漿侵入活動時(shí)間具有明顯的耦合關(guān)系,結(jié)合本文礦床地質(zhì)和流體包裹體特征的研究,460金礦床屬于富碲的淺成低溫?zé)嵋盒偷V床,成礦年齡為海西中、晚期。
[Abstract]:The gold deposit is located on the suture line of plate formed by collision between Siberian plate and Kazakstan plate, adjacent to Hongshi Mountain and Black Eagle Mountain body. The exposed strata of the mining area are mainly the formation of intermediate acid metamorphic volcanic rocks and clastic sedimentary rocks of Baishan formation of Lower Carboniferous, the structure of the mining area is dominated by the near NW fault, which is the main ore-controlling structure of the mining area. The magmatic rocks are mainly granodiorite, most of them are rock base, and they occur in the form of rock plants. The orebody mainly occurs in the faults or joints of granodiorite and is controlled by the near EW and NE faults. The ore is mainly of quartz vein type. The ore minerals mainly include pyrite, chalcopyrite, etc. The gangue minerals are mainly quartz, feldspar, chlorite, sericite, etc. The gold is mostly in the form of telluride. There are mainly diagonal tellurium gold deposits and goethurium gold silver ores. The ore structure mainly consists of semi-automorphic-allotropic grain structure, interstitial structure, metasomorphic network structure and so on. The structure of the ore is mainly vein-net vein, other banded, lumpy, and so on. The main alteration of surrounding rock is sericite, green mud, green curtain, carbonization, etc. The metallogenic stage is divided into quartz pyrite stage, quartz polymetallic sulfide stage and quartz carbonate stage from early to late. Fluid inclusions are found in gangue minerals (quartz, calcite) in all metallogenic stages. The types of inclusions include liquid rich Na Cl-H2O inclusions (W type) and submineral fluid inclusions (S type). Ellipsoid, like round and irregular shape is the majority, the second is negative crystal shape and so on. Most of the inclusions are concentrated in the range of 5 ~ 15 渭 m, and the gas-liquid ratio of inclusions varies from 10 to 30. The complete homogenization temperatures of fluid inclusions from early to late were 202.4U 348.3 鈩，

本文編號：2377760