周至马鞍桥金矿控矿规律及成矿预测研究
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
位于陕西周至县境内的马鞍桥金矿床,区域构造隶属于秦岭海西褶皱带北部边缘,含矿地层为上泥盆统的桐峪寺组,容矿岩石为细碎屑岩。区内岩浆活动较强烈,变质作用和后期热液活动明显。矿区围岩蚀变较发育,金的品位较低。
     矿区现分为东、中、西三个矿段。区内断裂构造发育。矿体受韧性剪切带控制,以似层状、透镜状赋存于泥盆系与石炭系间的层间断裂带中。金的富集严格受多级构造控制,区域性韧性剪切带控制了矿床的展布,而次级韧脆性剪切带控制了富矿体的分布,后期的脆性构造对矿体有一定的改造、破坏作用,同时也加强了金的再一次富集。强烈的构造变形即是金矿床形成的主导动因。矿床属于韧性剪切型金矿,韧性剪切带既是导矿构造,也是控矿、容矿构造。
     韧性剪切带型金矿中金的富集不仅在应变最强部位或韧性向脆性转换的部位,还可以在强变形带与弱变形域交接的部位。
     论文是在广泛收集前人资料的基础上,通过野外实地调查和室内研究完成的,结合秦岭地区区域地质条件和地质背景,论文提出在沙梁子—双庙子和庙沟—小王涧两区域性断裂之间,板房子—小王涧复向斜北翼的旭奋子—黄石板次级构造是主要的控矿及导矿构造,并通过构造的产状效应分析对矿区深部肓矿体做出推测:
     金矿脉展布在K20、K19、K25异常附近,并在香沟矿段K19号1150中段,蚀变指标有减弱趋势,可推测深部矿体无太大的延伸。在大崖沟1430中段发现蚀变矿化带,其中黄铁矿化较强烈,为下一步的找矿提供了有利的地段。
     同时,论文在马鞍桥金矿矿床成因问题上做了初步的探讨,并提出本区金矿物质部分来源于幔源的新认识。
Maanqiao gold deposit is located in Zhouzhi county, Shaanxi province. It is on the north edge of Vaviscian fold belt in Qinlin. Ore-bearing stratohorison is Tongyusi group of late Devonian system and ore-bearing rock is minute clastic rock formation. In the area, magma action is strong, metamorphism and hydrothermal action is evident. Wallrock alternation is wide spread. The tenor of gold is low.
    There are three parts in mine-east, middle and west. Faults are wide spread in the area. The orebodies controlled by ductile shear zone, which are lenticular and bedded, are in interlayer fault zone between Devonian system and Carboniferous system. The enrichment of gold is under the control of polyfactor-the outspread of the ore bed is controlled by the regional ductile shear zone, the rich orebody is controlled by the accessorial ductile-brittle shear zone, and the succedent brittle shearing formation break the mineral to some extent, also has some favorable function to the enrichment of gold. Strong transformation of geology is the main reason of the gold deposit' formation. The ductile shear zone is not only the ore-leading and ore -controlling structure , but also the ore-bearing structure.
    In the gold deposit which belongs to the ductile shear zone, there is rich gold deposit not only in the zone where there is strong transformation or where the ductile of fault shear zone changes to the brittle shear zone, but only in the belt where there is weak transformation
    The dissertation is on the basis of collecting predecessors' achievement, and brings to success by field autoptical and studies in doors. By researching geology condition and geology background, it is concluded that the main ore-controlling ore-leading structure is The accessorial formation of Xufenzi-Huangshiban, which is to the north of Banfangzi-Xiaowangjian, which is in the fault belt between Shaliangzi-Shuangmiaozi and Miaogou-Xiaowangjan.
    It is also concluded that the ore bed in the depths of K20, K19 and K25 are rich. It is predicted that it is difficult to forming ore beds in the depth of K19 because the index of wallrock alternation decreases. A lot of iron pyrites in the meddle of 1430 near ore bed in Dayagou can be found , which is the next foreground of finding ore.
    At the same time, the dissertation has also made a discuss about the genesis of the ore bed and brings forward a new idea that partial aurum of the gold deposit comes from the mantle.
引文
1 陕西马鞍桥金矿勘探报告
    2 邵世才,马鞍桥金矿成矿规律与矿体深部预测研究,2002
    3 张学仁等,陕西马鞍桥金矿盲矿预测研究报告,2003
    4 第七届全国矿床会议论文集,2003,地质出版社
    5 徐开礼、朱志澄,构造地质学,1983,地质出版社
    6 胡正国、钱壮志等,小秦岭拆—离变质杂岩核构造与金矿,1994,陕西科学技术出版社
    7 钱壮志等,东昆仑中带成矿地质构造环境及金矿成矿模式,2000,西安地图出版社
    8 秦岭成矿带金矿遥感地质综合调查研究报告(内部资料),1995
    9 林森楠、杨巍然,中国区域地质大地构造学,1984,地质出版社
    10 袁见奇、朱士庆、翟裕生,矿床学,1984,地质出版社
    11 张伯声地质论文集,1993,陕西科学技术出版社
    12 张国伟等,秦岭造山带及其演化,1989,西北大学出版社
    13 隗合明,周至马鞍桥金矿床成矿控制条件及找矿标志,西安地质学院学报 1997,第19卷第4期
    14 魏宽义等,马鞍桥金矿控矿构造规律及成矿预测,西安工程学院学报,2001,第23卷第一期
    15 张复新、马建秦,马鞍桥金矿成矿地质条件及矿床成因,1997,地质找矿论纵,第十二卷第一期
    16 李福东等,马鞍桥微细浸染型(沉积岩容矿)金矿床(体)快速定位预测研究,2001,西北地质,第34卷第1期
    17 李瑞生,陕西周至马鞍桥金矿床地质特征及成因分析,1997,陕西地质,第15卷第2期
    18 曹思魁,陕西商州龙庙、周至马鞍桥铜黝银矿矿物特征研究,1997,地质实验室,第18卷第1期
    19 张拴宏、王书兵,陕西周至马鞍桥金矿控矿构造及成矿模式,1999,地质找矿论丛,第14卷第3期
    
    
    20 栾世伟等,1987,金矿床地质及找矿方法,四川科学技术出版社
    21 李晓峰、华仁民,韧性剪切带变形变质作用与金的矿化富集,2001,桂林工学院学报,第21卷第3期
    22 秦大军,韧性剪切作用与深源流体演化和金矿化的耦合关系,1997,地质地球化学,第3期
    23 刘忠明、杨巍然,剪切带中流体与金矿成矿作用的关系综述,1997,地质科技情报,第16卷第4期
    24 陈广浩等,构造成矿理论的研究进展及在金矿找矿中的应用,2002,地质科学,第37卷第4期
    25 王可勇,我国微细浸染型金矿床的形成条件及成矿作用特征,2000,贵金属地质,第9卷第3期
    26 陈柏林,与韧性剪带有关的不同金矿化类型地质地球化学特征对比研究,2000,地质地球化学,第28卷第3期
    27 邱小平,深部韧性剪切带变形与金矿成矿作用,1999,黄金地质,第5卷第3期
    28 邓军等,剪切蚀变与物质迁移及金的富集,2000,地球科学,第25卷第4期
    29 李惠等,大型特大型金矿盲矿预测的原生晕叠加模型,1998,冶金工业出版社
    30 孙晓明,韧性剪切带中的脆性构造及其对金矿化的控制,1998,中山大学学报,第37卷第1期
    31 Bonne maison M "felons de quartz aurifere" an cas particulier de shear zone aurifere.chron.Rech.Min., 1986,482:55—65
    32 卢焕章,成矿流体,1997,北京科学技术出版社
    33 Ramsay J G,Graham R H.Strain variation in shear belt[J].Can J Earth Sci, 1970,7:789_801
    34 Liane G B,Terry M S.Hyrosulphide complexing of Au(1) in hydrothermal solutions from 150~400℃ and 500 bar ~1500bar. Geochimica et Cosmochimica Acta, 1996, 60(11): 1 8491871
    
    
    35 贺同兴等,变质岩岩石学,1988,地质出版社
    36 李侠,镶嵌构造理论与实践研究,1998,西安地图出版社
    37 马建伟等,秦岭成矿带金矿遥感地质综合调查研究报告,1995
    38 矿床成因论(第八届国际矿床成因协会科学讨论会论文集),福建科学技术出版社,1991
    39 梁文艺、孙继东等,活动剪切带的有序叠加与金矿的形成,1993,西北大学出版社

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700