黑龙江省大兴安岭地区小柯勒与972高地金多金属矿床地质特征及成矿预测

发布时间：2018-04-18 15:19

本文选题：斑岩型矿床 + 矿床地质特征　；参考：《吉林大学》2017年硕士论文

【摘要】：小柯勒与972高地金多金属矿床位于黑龙江省大兴安岭新林区,新林镇东,是黑龙江省大兴安岭地区典型的斑岩型金多金属矿床。大地构造位置位于大兴安岭中生代火山岩带北段东坡、额尔古纳地块额木尔山中间隆起带上,属大兴安岭多金属成矿带内。矿区地层出露复杂,大面积出露白垩系下统光华组、甘河组,第四系上更新统雅鲁河组、全新统。矿区内岩浆岩分布零散,以侵入岩为主,零星分布少量脉岩。其中早白垩世花岗闪长斑岩是小柯勒与972高地金多金属矿床的重要含矿岩体。研究区内花岗闪长斑岩成岩时代为142Ma,属于早白垩世,为燕山晚期岩浆事件。岩石地球化学数据表明闪长玢岩为高钾钙碱性系列准铝质岩石。岩浆岩成矿作用与环太平洋造体系关系密切。花岗闪长斑岩形成于挤压-伸展转换环境下。小柯勒与972高地金多金属矿区共分为3个矿段—I矿段、II矿段及III矿段。目前工程揭露矿体主要分布I矿段,矿体主要为钻孔中的隐伏矿体,花岗闪长斑岩为赋矿围岩。研究发现金属矿物主要为黄铁矿、黄铜矿、辉钼矿。构造可见有浸染状构造、细脉浸染状及脉状构造。矿体围岩蚀变具有典型的面型蚀变特征,由内向外依次发育钾质蚀变带(钾化)—似千枚岩化蚀变带(硅化、绢云母化)—泥质蚀变带(高岭土化)—青磐岩化带(碳酸盐化、绿泥石化、绿帘石化)(陈俊,2015)。见矿较好位置位于I矿段的北部,本次研究利用钻探工程控制隐伏矿体在深部的延伸情况,新发现多条铜、钼以及铜钼矿体,以典型的黄铁绢英岩为主,受斑岩体及构造控制明显。矿石矿物可见浸染状、细脉状、团块状的黄铁矿;浸染状及细脉浸染状的黄铜矿、辉钼矿、镜下局部可见方铅矿、闪锌矿等。流体包裹体研究表明,矿区主成矿阶段即石英—多金属硫化物阶段主要发育气液两相及含子晶多相包裹体。成矿流体显示中温、高盐度的特点,通过投图得出矿床的成矿压力为20~50MPa,成矿深度为0.7~1.7km。通过对小柯勒与972高地金多金属矿床与国内外典型斑岩型矿床对比分析,认为小柯勒与972高地金多金属矿床成因类型应定为斑岩型矿床。通过对地质条件研究、物化探异常查证的工程结果进行综合分析,认为该矿床成因与该区发现的花岗闪长斑岩体有关,将I矿段北部划为重点成矿区并划为下步工作的重点靶区。
[Abstract]:The Xiaokole and 972 highland gold polymetallic deposits are located in Xinlin District, Daxinganling, Heilongjiang Province, east of Xinlin Town, and are typical porphyry type gold polymetallic deposits in Daxinganling area, Heilongjiang Province.The tectonic position is located in the eastern slope of the Mesozoic volcanic rock belt in the Daxinganling Mountains and the middle uplift belt of the Erguna massif, belonging to the Daxing'anling polymetallic metallogenic belt.The strata in the mining area are complicated, the Guanghua formation of Lower Cretaceous, the Ganhe formation, the Yaluhe formation of Upper Pleistocene of Quaternary, the new series.Magmatic rocks are scattered, mainly intrusive rocks, and a few dikes are distributed sporadically.Among them, the early Cretaceous granodiorite is an important ore-bearing rock mass in the gold polymetallic deposits of Xiaokole and 972 highlands.The diagenetic age of granodiorite in the study area is 142 Ma.It belongs to the early Cretaceous and is a late Yanshanian magmatic event.The petrogeochemical data indicate that the diorite porphyrite is a high potassium calc-alkaline series of quasialuminous rocks.Magmatic mineralization is closely related to the Pacific Rim system.Granodiorite was formed in the environment of compression-extensional transformation.Small Coller and 972 highland gold polymetallic ore area are divided into 3 ore sections: I ore section II and III ore section.At present, it is revealed that the ore bodies are mainly distributed in section I, the orebodies are mainly concealed orebodies in boreholes, and the granodiorite is ore-bearing surrounding rock.It is found that the main metal minerals are pyrite, chalcopyrite and molybdenum.The structure can be seen as disseminated structure, vein-like structure and veinlike structure.The alteration of the surrounding rock of the orebody is characterized by typical surface type alteration. From the inside to the outside, the K alteration zone (K + +-K +-like phyllite alteration zone) (silicification, sericite-muddy alteration zone (kaolinization)-Qingwanglitization zone (carbonatizing) is developed in turn.Green mud petrifaction, green curtain petrifaction (Chen Jun / 2015).The better position of the ore is located in the northern part of the I ore section. In this study, several copper, molybdenum and copper-molybdenum ore bodies have been discovered by drilling engineering to control the extension of the concealed orebodies in the deep, and the typical yellow sericite is the main ore body.It is obviously controlled by porphyry and structure.Ore minerals can be seen in disseminated, vein-like, massive pyrite, disseminated and vein-dyed chalcopyrite, molybdenum, mirror-localized galena, sphalerite, etc.The study of fluid inclusions shows that the main metallogenic stage is the quartz-polymetallic sulfide stage in which gas-liquid two-phase and sub-crystalline polyphase inclusions are mainly developed.The ore-forming fluid shows the characteristics of medium temperature and high salinity. The ore-forming pressure of the deposit is 20 ~ 50MPa and the ore-forming depth is 0.7 ~ 1.7km.Based on the comparative analysis of the gold polymetallic deposits in small Kole and 972 highlands and typical porphyry deposits at home and abroad, it is concluded that the genetic types of the gold polymetallic deposits in Xiao Kole and 972 highlands should be regarded as porphyry deposits.Based on the study of geological conditions and the engineering results of geophysical and geochemical anomaly verification, it is concluded that the genesis of the deposit is related to the granodiorite discovered in this area.The northern part of section I is classified as a key metallogenic area and a key target area for the next step.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.2

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