内蒙古敖汉旗乌兰地区金多金属-萤石矿床控矿规律及成矿预测
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摘要
近年来,在敖汉复向斜内陆续发现了数十个金多金属和萤石矿床,找矿成果显示了地槽-地台边缘向地槽延伸部分比向地台延伸部分更具成矿潜力,打破了以往靠华北地台一侧矿床(点)相对密集分布的格局。通过对该区域内岩浆活动、构造展布、蚀变分带组合和大量不同类型多金属矿床空间分布等方面的对比研究,归纳和总结该地区的多金属成矿规律。研究表明,矿床集中分布于三条平行展布的北东向隆起区边缘,受晚侏罗世黑云母花岗岩边缘相和外接触带控制,且同一成矿单元中,矿床的容矿构造走向基本一致。以花岗斑岩为中心,自内向外由高温→中温→低温金属矿物,形成了相应的蚀变分带和矿化分带,构成一套完整的多金属成矿体系。萤石成矿作用晚于金属矿,矿体严格受NNE构造控制,与金属矿床异区分布、独立存在。最后,通过控矿因素和成矿作用的综合研究,对研究区内的多金属和萤石成矿进行了远景预测。
In recent years,dozens of polymetallic and fluorite deposits have been discovered successively in Aohan syncline,which shows that the extension part of the geosyncline-platform margin has more metallogenic potential than the platform extension part,breaking the previous distribution pattern of deposits around the North China Platform. Based on the comparative study of magmatic activity,tectonic distribution,alteration zoning and spatial distribution of different types of polymetallic deposits,the polymetallic metallogenic regularity in Ulan area is summarized. The results show that,The deposits are concentrated in the margins of three parallel NE-trending uplifts,controlled by the margin facies and outer contact zone of biotite granite of the Late Jurassic,and the ore-hosting structure of the deposit has basically the same strike in the same metallogenic unit. With granite porphyry as the center,corresponding alteration zoning and mineralization zoning are formed,and high temperature,medium temperature and low temperature metal minerals are distributed from inside to outside,forming a complete polymetallic metallogenic system. Fluorite deposits exist independently and are strictly controlled by NNE structure. They are distributed differently from metal deposits,and their metallogenesis is later than that of metal deposits. Finally,through the comprehensive study of ore-controlling factors and mineralization,the polymetallic and fluorite deposits in this area are predicted.
In recent years,dozens of polymetallic and fluorite deposits have been discovered successively in Aohan syncline,which shows that the extension part of the geosyncline-platform margin has more metallogenic potential than the platform extension part,breaking the previous distribution pattern of deposits around the North China Platform. Based on the comparative study of magmatic activity,tectonic distribution,alteration zoning and spatial distribution of different types of polymetallic deposits,the polymetallic metallogenic regularity in Ulan area is summarized. The results show that,The deposits are concentrated in the margins of three parallel NE-trending uplifts,controlled by the margin facies and outer contact zone of biotite granite of the Late Jurassic,and the ore-hosting structure of the deposit has basically the same strike in the same metallogenic unit. With granite porphyry as the center,corresponding alteration zoning and mineralization zoning are formed,and high temperature,medium temperature and low temperature metal minerals are distributed from inside to outside,forming a complete polymetallic metallogenic system. Fluorite deposits exist independently and are strictly controlled by NNE structure. They are distributed differently from metal deposits,and their metallogenesis is later than that of metal deposits. Finally,through the comprehensive study of ore-controlling factors and mineralization,the polymetallic and fluorite deposits in this area are predicted.
引文
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(2)赵志民,于泽新.2007.内蒙古自治区敖汉旗鸭鸡山矿区铜钼矿详查报告:1-127.
(3)王运峰,李逸群.2010.内蒙古自治区敖汉旗白马石矿区钼铜矿详查报告:1-98.
(4)王子祥,刘家生.2010.内蒙古自治区敖汉旗撰山子金矿外围普查总结报告:1-75.
(5)夏宝清,扬欣荣.2017.内蒙古自治区敖汉旗小四家矿区硅石(萤石)矿详查报告:1-92.
(6)柷洪涛,王宇.2009.内蒙古自治区敖汉旗七家金矿核查矿区资源储量调查报告:1-76.
(7)任学通,任玉樽.2012.内蒙古自治区敖汉旗毛头山矿区岩金矿详查报告:1-142.
(8)王学军,王黎.2010.内蒙古自治区敖汉旗中井矿区金矿补充详查报告:1-78.
高玉友,邱学祥,王宇,等.2017.内蒙古敖汉旗岱王山金矿田地质特征和资源潜力预测[J].地质与勘探,53(1):35-42.
李文国,李庆富,姜万德,等.2008.内蒙古自治区岩石地层[M].北京:中国地质大学出版社:1-156.
黎伟,祝洪涛,巫建华,等.2017.内蒙古红山子-广兴铀矿田控矿因素探讨和找矿靶区优选[J].东华理工大学学报(自然科学版),40(2):115-125.
覃锋,刘建明,曾庆栋,等.2009.内蒙古克什克腾旗小东沟斑岩型钼矿床成岩成矿机制探讨[J].岩石学报,25(12):3357-3368.
施俊法,唐金荣,周平,等.2010.世界找矿模型与矿产勘查[M].北京:地质出版社:1-300.
孙珍军.2013.华北克拉通北缘赤峰-朝阳地区金矿成矿作用研究[D].长春:吉林大学:1-70.
王丰翔,孙爱群,裴荣富,等.2016.内蒙古撰山子金矿床地质、地球化学特征及成因研究[J].地质学报,90(8):1798-1816.
吴珍汉.孟宪刚.1998.燕山陆内造山带金-多金属成矿作用与构造-成矿关系[M].北京:地质出版社:1-99.
肖荣阁,龚羽飞,翟裕生,等.1999.变质岩区金矿成矿系统[J].地学前缘,6(2):243-250.
曾庆栋,刘建明,褚少雄,等.2011.西拉沐伦成矿带中生代花岗岩浆活动与钼成矿作用[J].吉林大学学报(地球科学版),41(6):1705-1714.
张林,吴琼,杨春雷.1998.内蒙撰山子金矿构造控矿规律与成矿预测[J].地质与勘探,34(2):11-14.
赵鹏大.2007.成矿定量预测与深部找矿[J].地学前缘,14(5):1-10.
钟福军,潘家永,夏菲,等.2015.我国火山岩型铀矿找矿预测地质模型的构建与应用[J].东华理工大学学报(自然科学版),38(2):135-143.
Goldfarb R J,Groves D I,2001.Gardfoll S.Orogenic gold and geologic time:a global synthesis[J].Ore Geology Reviews,18(2):1-75.
Groves D I,Goldfarb R J,Gebre-Mariam,et al.1998.Orogenic gold deposits:a proposed classfication in the context of their crustal distribution and relationship to other gold deposit types[J].Ore Geology Reviews,13(1):7-27.
(1)高玉友,邱学祥.2014.内蒙古自治区敖汉旗大坑金矿普查总结报告:1-89.
(2)赵志民,于泽新.2007.内蒙古自治区敖汉旗鸭鸡山矿区铜钼矿详查报告:1-127.
(3)王运峰,李逸群.2010.内蒙古自治区敖汉旗白马石矿区钼铜矿详查报告:1-98.
(4)王子祥,刘家生.2010.内蒙古自治区敖汉旗撰山子金矿外围普查总结报告:1-75.
(5)夏宝清,扬欣荣.2017.内蒙古自治区敖汉旗小四家矿区硅石(萤石)矿详查报告:1-92.
(6)柷洪涛,王宇.2009.内蒙古自治区敖汉旗七家金矿核查矿区资源储量调查报告:1-76.
(7)任学通,任玉樽.2012.内蒙古自治区敖汉旗毛头山矿区岩金矿详查报告:1-142.
(8)王学军,王黎.2010.内蒙古自治区敖汉旗中井矿区金矿补充详查报告:1-78.