黑龙江省争光金锌矿矿床地质特征及成矿预测

发布时间：2018-01-28 11:35

本文关键词： 金锌矿床地质特征矿床成因成矿预测争光　出处：《吉林大学》2015年硕士论文　论文类型：学位论文

【摘要】：多宝山成矿带是我国北方重要的斑岩型Cu-Au-Mo成矿带,其大地构造位于古亚洲成矿构造域和滨太平洋成矿构造域的叠加部位,是大兴安岭弧盆系与小兴安岭弧盆系的交接部位,成矿地质条件优越,矿产资源丰富。争光金锌矿位于多宝山成矿带南东段,北西向上距离铜山铜矿约5km,距离多宝山斑岩型铜钼矿约10km。其成矿时代与多宝山铜-金矿的关系及深部找矿方向尚不明晰。本文选择该区近年来找矿工作取得较大突破,但理论研究相对薄弱的争光金锌矿床为研究对象,通过总结金锌矿床特征,研究成矿流体特征、地球物理和化学特征,成岩时代和构造背景等特征,进一步厘定金锌矿成矿类型,探讨该区未来找矿方向和成矿预测。争光金锌矿区多种花岗闪长斑岩和长石斑岩等穿插矿体脉岩锆石U-Pb年代学工作表明,金成矿作用应早于454Ma。结合多宝山年代学工作成果,争光金锌矿床是受古亚洲洋俯冲的岛弧环境控制,与多宝山含金铜、钼矿床和铜山铜矿床近于同期或略晚的金成矿系统。研究区地球物理特征和矿床特征表明,争光金锌矿床主要为低磁-中极化特征,矿体因热液蚀变,则进一步表现为弱磁特征。从矿化特征、脉系组合特征、蚀变分带特征上,争光应属于浅成低温热液型矿床,而不同于构造蚀变岩型金矿;从特征矿物组合、硫化物含量、闪锌矿Fe含量、特征矿物结构构造划分,争光金锌矿床则属于中硫型金矿床,为高硫型向低硫型过渡类型,并伴生锌矿化。研究区主要以古生代北西向构造和北东向次级构造活动组成区内基本构造格局,后期发生继承性构造活动形成区内北西向、北东向、南北向等构造格局。结合多宝山-争光航磁异常特征和出现多组火山角砾岩、大量发育火山碎屑岩等特征,推测区内可能存在火山-次火山构造活动,为金锌矿体运移和储存提供通道和空间。通过对区内成矿地质特征的进一步研究,总结矿床成矿规律,结合地球物理和地球化学异常特征,对争光金锌矿区东部、II号带深部和I、IV号矿带与II号带之间构造活动区域进行成矿预测。预测研究区内深部具有寻找金、铜矿床潜力,浅部金矿具备突破50t潜力。
[Abstract]:The Duobaoshan porphyry metallogenic belt is an important metallogenic belt of North China Cu-Au-Mo, parts of the tectonic superposition in paleo Asian metallogenic tectonic domain and the Pacific tectonic domain, is the junction of the Greater Khingan Range arc basin system and small Xingan mountain arc basin system, favorable metallogenic conditions and abundant mineral resources. The glory of gold zinc ore located in the South East Baoshan metallogenic belt, North West from the Copper Mt. copper mine is about 5km and the distance of the Duobaoshan porphyry copper molybdenum deposit metallogenic epoch and the relationship about 10km. Duobaoshan copper - gold and deep ore prospecting direction is still not clear. In this paper the district made great breakthroughs in recent years prospecting work, but theory study on the relatively weak credit gold zinc deposit as the research object, through summing up the gold zinc deposit characteristics, study the characteristics of ore-forming fluids, geophysical and geochemical characteristics, diagenetic age and tectonic background characteristics, further mineralization gold zinc ore The type, discuss the future prospecting direction and metallogenic prediction of this area. The glory of gold zinkgruvan variety of granodiorite porphyry and porphyry ore veins feldspar with zircon U-Pb geochronology shows that gold mineralization should be earlier than the 454Ma. with the Baoshan chronology work, glory gold zinc deposit is controlled by the subduction of the paleo Asian Ocean island arc environment Duobaoshan copper, and gold, gold metallogenic system of molybdenum deposit and Copper Mt. copper deposit is the same or slightly later. Indicating that the study area of geophysical characteristics and ore deposit characteristics, the glory of gold zinc deposit is mainly low magnetic polarization characteristics, orebody due to hydrothermal alteration, further showed weak magnetic characteristics. From the characteristics of mineralization the combination of features, veins, alteration zoning characteristics, the glory belongs to the epithermal deposit, which is different from the tectonic altered rock type gold deposit; from the mineral assemblages, the sulfide content of sphalerite, Fe content, characteristics of mineral structure Tectonic division, gold deposit belongs to the glory of zinc sulfur type gold deposit for high sulfur to low sulfur type transition type, and the associated zinc mineralization. The study area mainly in the Paleozoic NW and NE trending secondary tectonic activities basic tectonic pattern in the region, the late occurrence of inherited tectonic activities forming region in the North West to the north, East, North and south to the tectonic pattern. With Baoshan glory aeromagnetic anomalies and multiple volcano breccia, a large number of development characteristics of volcano clastic rocks, predicted the existence of volcano subvolcano tectonic activity in the region, to provide space and channel for the gold ore bodies through a further study on the migration and storage. The geological characteristics of mineralization zone, metallogenic regularity of ore deposit, combining geophysical and geochemical anomalies, the glory gold mine in eastern II, zinc, with deep and I, IV and II between ore belt metallogenic tectonic activity region. The prediction research area has the potential to find gold and copper deposits in the deep part of the study area, and the shallow gold deposits have the potential to break through 50t.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51;P618.43

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