苍峄铁矿带成矿控矿规律及成矿模式探讨
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摘要
山东省苍峄地区铁矿资源丰富,是典型的"鞍山式"铁矿成矿区。先后发现和评价了多处大中型铁矿床。该文在介绍苍峄铁矿带成矿地质特征基础上,将其分为5个含矿带,矿体赋存于泰山岩群山草峪组中上部,严格受山草峪组地层控制,展布形态受太白向斜和石闫背斜两褶皱构造的控制,断层构造破坏了赋矿构造及矿体的连续性,间接控制了铁矿体的赋存和分布。原岩建造为基性火山岩-中酸性火山岩-粉砂岩-硅铁质建造,属火山活动间歇期成矿。分析认为成矿物质来源与海底火山活动密切相关,遭受后期变质作用后成矿物质富集,为沉积变质铁矿床产于以黑云变粒岩为主并夹有角闪质岩石等岩层的铁矿,铁矿沉积后,受后期强烈构造-热液改造叠加,矿体形态以似层状、透镜状为主。向斜构造是矿体富集保存的最佳构造模式,接近向斜核部矿体厚度增大,品位也有增高趋势。
Cangbo area in Shandong province is rich in iron ore resources.It is a typical "Anshan type" iron oreforming area.Several large and medium iron deposits have been discovered and evaluated successively.On the basis of introducing the metallogenic geological characteristics of Cangfu iron ore belt,it can be divided into five orebearing belts.The ore bodies occur in the middle and upper part of Shancaoyu formation of Taishan group,which are strictly controlled by strata of Shancaoyu formation.The distribution pattern is controlled by two fold structures of Taibai syncline and Shiyan anticline.The fault structure destroys the continuity of ore-hosting structure and ore body,and indirectly controls the occurrence and distribution of iron ore bodies.The protolith formation is basic volcanic rock-intermediate acid volcanic rock-siltstone-ferrosiliceous formation,which belongs to volcanic intermittent mineralization.It is concluded that the source of ore-forming materials is closely related to submarine volcanic activities.After the late metamorphism,the ore-forming materials are enriched.The deposit is a sedimentary metamorphic iron ore deposit produced in an iron ore deposit with biotite granulite as the main rock layer and amphibolite as the main rock layer.After the iron deposit,it is superimposed by strong tectonic-hydrothermal transformation in the later period,and the ore body is mainly layered and lenticular.Syncline structure is the best structural model for ore body enrichment and preservation.The thickness of ore body near the core of syncline increases,and the grade also tends to increase.
Cangbo area in Shandong province is rich in iron ore resources.It is a typical "Anshan type" iron oreforming area.Several large and medium iron deposits have been discovered and evaluated successively.On the basis of introducing the metallogenic geological characteristics of Cangfu iron ore belt,it can be divided into five orebearing belts.The ore bodies occur in the middle and upper part of Shancaoyu formation of Taishan group,which are strictly controlled by strata of Shancaoyu formation.The distribution pattern is controlled by two fold structures of Taibai syncline and Shiyan anticline.The fault structure destroys the continuity of ore-hosting structure and ore body,and indirectly controls the occurrence and distribution of iron ore bodies.The protolith formation is basic volcanic rock-intermediate acid volcanic rock-siltstone-ferrosiliceous formation,which belongs to volcanic intermittent mineralization.It is concluded that the source of ore-forming materials is closely related to submarine volcanic activities.After the late metamorphism,the ore-forming materials are enriched.The deposit is a sedimentary metamorphic iron ore deposit produced in an iron ore deposit with biotite granulite as the main rock layer and amphibolite as the main rock layer.After the iron deposit,it is superimposed by strong tectonic-hydrothermal transformation in the later period,and the ore body is mainly layered and lenticular.Syncline structure is the best structural model for ore body enrichment and preservation.The thickness of ore body near the core of syncline increases,and the grade also tends to increase.
引文
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(1)山东省鲁南地质工程勘察院,山东省苍峄铁矿带矿田构造及找矿方法研究报告,2017年。
[2]郝兴中,杨毅恒,李英平,等.山东苍峄铁矿带预测模型[J].吉林大学学报(地球科学版),2013,43(4):1136-1142.
[3]王世进,万渝生,宋志勇,等.鲁西泰山岩群地层划分及形成时代---锆石SHRIMP U-Pb测年的证据[J].山东国土资源,2012,28(12):18-19.
[4]孙茂田,安仰生,张忠涛.苍峄铁矿带地质特征及找矿远景分析[J].山东国土资源,2017,33(4):6-14.
[5]甘延景,杜显彪,朱宁,等.鲁西苍峄铁矿带构造控矿特征浅析[J].山东国土资源,2018,34(4):1-7.
[6]温殿刚.探讨山东东平大高庄铁矿成矿地质特征与找矿分析[J].世界有色金属,2017(5):205-206.
[7]王继广,李静,李庆平,等.鲁西地区绿岩带型金矿及其矿源层探讨[J].地质学报,2013,87(7):994-1001.
[8]王继芳,徐然,杜显彪,等.山东省东平县大高庄铁床地质特征及矿床成因[J].山东国土资源,2016,32(5):32-37.
[9]于学峰,张天祯,王虹,等.山东省矿床成矿系列[M].北京:地质出版社,2015:88.
[10]刘玉强,李洪喜,黄太岭,等.山东省金铁煤矿床成矿系列及成矿预测[M].北京:地质出版社,2004:1-20.
[11]田明阳,陈玉菡,张相峰,等.济宁市汶上泰山岩群张楼铁矿床特征及成因探讨[J].山东国土资源,2015,31(1):8-11.
[12]周军,葛均,段红梅.鲁西台上铁矿床地质特征及矿床成因[J].山东国土资源,2010,26(10):8-9.
[13]王杰亭,刘争,吕玉凤.密怀地区沉积变质型铁矿成矿模式[J].现代矿业,2011,501(1):58-59.
[14]关广岳.论变质作用在鞍山式铁矿床富矿形成上的意义[J].地质学报,1961,41(1):67-78.
(1)山东省鲁南地质工程勘察院,山东省苍峄铁矿带矿田构造及找矿方法研究报告,2017年。