黑龙江嘉荫县乌拉嘎金矿矿床成因及预测
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摘要
乌拉嘎金矿床是黑龙江省重要的黄金矿产基地。经多年开采,后备储量严重不足,亟需探矿增储。论文对该矿床地质特征、控矿条件及矿床成因进行详细研究;结合勘查地球物理及地球化学等方法,对矿区深(边)部进行预测。
     研究认为本区矿床受控于NNE向乌拉嘎深大断裂NWW向张性断裂为主的次级断裂,围岩蚀变具硅化、冰长石化、绢云母化、碳酸盐化等低温蚀变矿物组合,矿石中存在胶状、草莓状黄铁矿、白铁矿等低温矿物组合,矿体与斑岩体无成因联系,斑岩体只是作为容矿围岩而不是成矿岩体。成矿流体属低盐度低密度流体,成矿温度低(主成矿温度150-220℃),成矿深度约为2.3km,矿床成因类型为低硫化型浅成低温热液矿床。
     通过矿体空间定位规律研究,1号矿脉内矿体斜列分布,矿带及单个矿体均向NWW侧伏;产状变陡部位为含矿断裂的张开部位,是主要的赋矿部位。
     矿床成因类型及构造控矿规律主导矿区深(边)部找矿思路。
Wulaga gold deposit is the main gold deposit in Northeast China. It mothball resources are faced with troubles of deficiency; some new reserves must be searched in order to postpone fixed number of years of service.
     It lies in Jiayin county Heilongjiang Province. Geotectonically, the Deposit lies at the joint of Taipinggou upwarping and Jiayin down-warping belt which belongs to the northern Jamusi upheaval belt. The Jamusi upheaval belt is located at Jilin-Heilongjiang geosynclinal system which is in the east segment of Tianshan-Inner Mountain fold belt. It is affected by the geological developing and evolvement of Central Asia- Mongolia Plate and Pacific Plate. The structure is complicated in the diggings. The nearly EW trend fold and fault are the basement structures. Pacific Plate subduct to Eurasia Continent, which formed the NNE trend Wulaga deep-seated fault in Mesozoic era.
     The strata outcropping in the area include Proterozoic Heilongjiang Group which are metamorphic rocks. Its lithology characterize is mainly chlorite-albite-schist, chlorite-tremolite-schist, quartz-schist. The strata also include Mesozoic and Cenozoic volcanic sediment rocks: Lower Cretaceous Ningyuancun Formation, Taoqihe Formation, upper Cretaceous Yuliangzi Formation, Cenozoic Miocene, Pliocene and Pleistocene. The gold content is high (the average grade is 28.8 ppb) in the metamorphic rocks. It is supposed that the metamorphic rocks provided several mineral matters. The magmatic intruding activities are mainly plagioclase-granite porphyry in the Yanshan period. Orebodies lie in plagioclase-granite porphyry structural breccia belt mostly, others in the porphyry and schist fragmentation alteration belt.
     NNE trend Wulaga deep-seated fault is the ore-leading and rock-leading structure. It controlled the magmatic activities and hydrothermal fluid movement. NWW trend fault which is sub-structure of Wulaga deep-seated fault is the mainore-controlling structure.
     The ore minerals in the Wulaga gold deposit are mainly composed of natural gold, pyrite, marcasite, stibnite; gangue is mainly colloid calcedony quartz, calcite, kaolin. The texture of the ore bodies are colloidal texture, fine grain-dissemination texture. The main structure of the ore bodies are vein structure, stockwerke structure. There are many types of wall-rock alteration, such as chloritization and epidotization, berecitization, carbonatization, silicification; pyritization, pyrite-beresitization, propylitization. Mineralized silicification is linear distributed and controlled by structure. It is closely related to gold mineralization.
     According to the analyzing of liquid component of fluid inclusions, the deposit has characteristics of low salinity and low temperature. The temperature ranges from 152.2℃to 329.6℃. The main value is between 150℃and 220℃. The salinity value is from 1.22wt%NaCl to 5.4wt%NaCl, with the average 3.3wt%NaCl. The value of density is between 0. 75 and 0. 94 g/ cm3. The average value of pressure is 23.24×105 Pa. On the base of the relationship between depth and pressure (Sun Fengyue et al, 2000), a 2.32km average metallogenic depth is worked out. The ore-forming fluids were composed of major H2O, and minor CH4, H2S, CO, CO2 (Wang Keyong, 2004). The value ofδ18OH2O is between–2.73‰and 5.81‰,whileδDH2O is from-78.25‰to–132.64‰. The metallogenic fluid of Wulaga gold deposit was main atmospheric condensation and it was formed in the environment of low temperature. There is not ore genesis relationship between the gold mineralation and plagioclase-granite porphyry. The plagioclase-granite is the wallrock of the ore bodies.
     The early stage of ore-forming, the magmatic water is the main ore-forming fluid. And magmatic thermal up-welling leads to the rock cryptoexploded on the top and side. It formed a ringy cryptoexplosive ore-bearing breccia belt. This is the first stage porphyry-like mineralization. The main ore-forming stage of Wulaga gold deposit is the epithermal one. Buried magmatic rock provided the heat and driving force. Atmospheric water infiltrated deep through the fissure, and the hot fluid went up. Atmospheric water and hot fluid composed of the fluid circulation system. The fluid leached the mineral matters of Proterozoic Heilongjiang Group when it rised. Then the value of Eh and pH changed when the pressure reduced in shallow and fluid boiled, which resulted in the gold precipitation and low temperature mineral assemblage formed, such aschalcedony-quartz and adularia et al. It is formed the low sulfurdation epithermal deposits.
     The ore bodies in the No.1 vein were the main ore bodies in the diggings. They lie in plagioclase-granite porphyry structural breccia belt mostly. Ore-controlling faults characterized undulating varies in strike and dip. So the ore bodies occur will recur between enrichment segment and barren interval. Ore bodies NWW-trend diagonal distributed, and the pitch angle is 7°±. In the dip, orebodies occurred in local extensional place when the ore-controlling fault dip steeper. And there is no orebodies when dips slighter.
     On the base of the summarizion and study on the ore-forming condition and the rule of enrichment, effective method is adopted to prognosticate orebodies in deep(side) in the diggings. The polarizability is rather low and the resistivity is high in plagioclase-granite porphyry. There is relative high polarizability and strong Hg anomal in ore-bearing alteration fragmentized zones. According to the measure of induced polarization and mercury vapor along the pitch and dip of ore bodies, the bodies of high polarizability and the place of high Hg content were found. Metallized bodies was discovered by the new borehole project verification. It is concluded that a buried ore body in deep. But if along NWW-trend deeper, the buried ore bodies was probably cut by late intrusion. There is still bigger potential of prospection along dip of the main ore bodies.
引文
[1] Corbett Greg.Epithermal gold for explorationists [J].AIG Journal-Applied geoscientific practice and research in Australia, 2002, (1): 1-26.
    [2] D. P. Cox,D. A. Singer. 矿床模式[M].1990.
    [3] EDWIN ROEDDER.流体包裹体[M].中南工业大学出版社,1986.
    [4] G 福尔著,潘曙兰,乔广生译.同位素地质学原理[M],科学出版社,1983.
    [5] Heald P,et al. Comparative anatomy of volcanic-hosted epithermal deposit: acid-sulfate and adularia-sericite types.Econ. Geol. 1987,82(1):1-26.
    [6] Hedenquist J W, Izawa E, Arribas A, White N C.Epithermal gold deposits:styles, Characteristics, and exploration . Resource Geology Special publication Number 1.Tokyo: The Society of Resource Geology, 1996.
    [7] Jochcn Hoefs 著,刘季花、石学法等译.稳定同位素地球化学[M]. 北京,海洋出版社,2000,83~148.
    [8] Ohmoto. Systematics of sulfur and carbon isotopes in hydrothermal ore deposits, Economic Geology, Vol.67, No.2, 1972.
    [9] Roedder E.Fluid inclusions[J].Reviews in Mineralogy,1984,12:25-35.
    [10]Sibson R H.Robert F, Poulsen K H.High-angle reverse faults, fluid-pressure cycling and mesothermal gold-quartz deposits.Geology,1988,16:551-555
    [11]曹熹.佳木斯复合地体[M].长春:吉林科学技术出版社,1992:37-45.
    [12]陈根文,夏斌,肖振宇等.浅成低温热液矿床特征及在我国的找矿方向[J].地质与资源,2001,10(3):165-171.
    [13]陈衍景,张静,赖勇.大陆动力学与成矿作用[C].北京:地震出版社,2001,5-72.
    [14]陈毓川等.中国矿床模式[M].地质出版社,1993.
    [15]池三川等. 隐伏矿床(体)的寻找[M].中国地质大学出版社,1988.
    [16]方进国. 下坂金矿床地质特征及找矿预测[J]. 矿产与地质,2006,20(2):133-137
    [17]傅良魁.电法勘探教程[M].北京:地质出版社,1983,1-283.
    [18]胡欢,王汝成,陆建军等.安徽铜陵狮子山矿田矽卡岩型金矿床的矿物组合、化学成分及成因意义[J].矿床地质,2001,20(4):86-98.
    [19]胡朋,赫英,张义等.浅成低温热液金矿床研究进展[J].黄金地质,2004,10(1):48-54.
    [20]江思宏,聂凤军,张义等.浅成低温热液型金矿床研究最新进展[J].地学前缘,2004,11 (2):401-411.
    [21]靳是琴,李先洲,刘福来等.乌拉嘎金矿的找矿矿物学[J].地质与勘探,1994,4:37-42.
    [22]李碧乐,王健.黑龙江团结沟金矿区花岗斑岩体与金矿化的关系[J].黄金,1998,19 (3):3-6.
    [23]李凤友.乌拉嘎金矿床找矿模型及其应用[J].黄金,2001,22 (6):11-13.
    [24]刘斌,朱思林,沈昆.流体包裹体热力学参数计算软件及算例[M].北京:地质出版社,2000,1-252.
    [25]刘连登等.论角砾/网脉一斑岩型金矿[J].矿床地质,1999,18(1):29-35.
    [26]刘鹏鄂,吴国学.黑龙江省团结沟地区隐伏金矿体预测准则[J].黄金,1998,19 (5):3-6.
    [27]刘英俊,曹励明,李兆麟等.元素地球化学[M].北京,科学出版社,1984.
    [28]毛景文,李荫清.河北省东坪锑化物金矿床包裹体研究:地幔流体与成矿关系[J].矿床地质,2001,20(1):23-36.
    [29] 毛伟和,不可见金的赋存状态研究.矿物学报,1990,10(1):66-74.
    [30]孟宪伟.团结沟金矿床的地球化学找矿模型[J].地质与勘探,1994,3:63-66.
    [31]牟保磊.元素地球化学[M].北京:北京大学出版社,1999,34-75.
    [32]南京大学地质学系,地球化学[M].北京,科学出版社,1979.
    [33]庞奖励.浅成低温热液金矿研究现状及其趋势[J].黄金地质,1995,1 (3):34-38
    [34]裴荣富. 中国矿床模式[M].1995.
    [35]朴寿成. 吉林小石人金矿地球化学异常特征及成矿预测[J].地质与勘探,2003,39(2):21-26.
    [36]邵洁涟.金矿找矿矿物学[M].北京:中国地质大学出版社,1990,1-158.
    [37]孙丰月,石准立,冯本智.胶东金矿地质及幔源 C-H-O 流体分异成岩成矿[M].长春:吉林人民出版社,1995,1-178.
    [38] 孙丰月.黑龙江省嘉荫县乌拉嘎金矿矿产预测设计,2006.
    [39]孙凤兴,吴国学,杨鹏等.团结沟金矿床地质模型[J].吉林地质,1996,15(2):52-60.
    [40]王可勇,任云生,程新民等.黑龙江团结沟金矿床流体包裹体研究及矿床成因[J].大地构造与成矿学,2004,28 (2):171-178
    [41]王濮,潘兆橹等.系统矿物学(上中下三册)[M].地质出版社,1982
    [42]王义文.中国金矿床稳定同位素地球化学研究[J].桂林冶金地质学院学报,1990,10(3):269-282.
    [43]王永祥,吴国学,白士俊等.乌拉嘎金矿床地质地球化学特征研究[J].世界地质,2005,24 (4):16-19.
    [44]魏菊英,王关玉等.同位素地球化学[M].地质出版社,1988.
    [45]魏仪方,刘春华.团结沟金矿床地质地球化学模型[J].黄金,1996,17(2):3-11.
    [46]吴国学,程军,汪振涌等.乌拉嘎金矿周边地区成矿规律及找矿前景[J].黄金,2005,26 (11):16-19.
    [47]吴国学.大功率激电法在团结沟金矿外围找矿中的应用[J].黄金,1995,16 (6):2-5.
    [48]吴国学.金矿床地球化学找矿信息分析─—以团结沟金矿为例[J].世界地质,1995,14 (2):43-46.
    [49]吴国学.团结沟金矿床综合找矿标志研究[J].长春地质学院学报,1994,24 (4):397-403.
    [50]吴尚全.团结沟斑岩金矿床多源成因的同位素地质学证据[J].地质与勘探,1984,20(2):28-31.
    [51]徐善法,张汉成,陈建平等.青海龙尾沟铜、金矿床地质特征、矿床成因及成矿远景分析[J].地质与勘探,2004,40(2):12-17.
    [52]杨天奇,魏仪方,何高文.中国陆相火山岩区特大型金矿床模型[M].北京:冶金工业出版社,1994.
    [53]杨言辰,李绪俊,马志红. 生产矿山隐伏矿体定位预测[J].大地构造与成矿学,2003,2:83-90.
    [54]姚凤良,孙丰月.矿床学教程[M].北京:地质出版社,2006.
    [55]翟裕生等.走向 21 世纪的矿床学[J].矿床地质,2001(20):10-14.
    [56]张德全,佘宏全,阎升好等.福建紫金山地区中生代构造环境转换的岩浆岩地球化学证据[J].地质论评,2001,47(6):608-616.
    [57]张均. 隐伏矿体定位预测方法[M].北京:地质出版社,1999:30-121.
    [58]张理刚.稳定同位素在地质科学中的应用[M].西安:陕西科学技术出版社,1985
    [59]张文淮等.流体包裹体地质学[M].中国地质大学出版社,1993.
    [60]张贻侠. 矿床模型导论[M]. 北京:地震出版社,1993.
    [61]张渊,孙丰月,彭晓蕾等.胶东西北部山上原家金矿金银矿物组合研究[J].黄金,2000,21(9):4-7.
    [62]张重泽.团结沟花岗闪长斑岩与金矿化的关系[J].地质地球化学,1992,201(5):65-68.
    [63]赵财胜,孙丰月,毛景文等.青海大场金矿床流体包裹体特征及其地质意义[J].矿床地质,2005,24(3):305-316.
    [64]中国矿床编委会.中国矿床[M].地质出版社,1989.
    [65]中国人民武装警察部队黄金指挥部.黑龙江省团结沟斑岩金矿地质[M].北京:地震出版社,1995,55-11.

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