安徽宁国东山坞地区金矿地质特征及成因
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摘要
宁国东山坞地区金矿位于钦杭成矿带北东段仙霞褶皱带,受张性断层控制,成矿地质体为构造角砾岩,围岩为早奥陶世印渚埠组泥岩和寒武纪—奥陶纪西阳山组泥质灰岩夹微晶灰岩。对宁国东山坞地区金矿进行岩石地球化学测试、槽探及钻探工作,总结该区金矿地质特征及成因。印渚埠组泥岩是东山坞地区金矿形成的基础,当张性断层穿过印渚埠组泥岩,或西阳山组泥质灰岩与印渚埠组泥岩界面附近叠加断层时,易圈定低品位金矿体。通过分析东山坞地区金矿的矿化特征、成矿结构面、成矿地质体及Au来源,初步认为东山坞地区金矿为远程低温热液交代叠加构造岩后形成的微细浸染型金矿。
The gold deposit in the Dongshanwu area of Ningguo City, Anhui Province, is tectonically located in the Xianxia fold belt in the northeastern section of Qinzhou-Hangzhou metallogenic belt. Extensional fault-controlled deposit occurs mainly in tectonic breccia. Wall rock consists of mudstone of early Ordovician Yinzhubu Formation and muddy limestone interbedded with lentoid microlite limestone of Cambrian-Ordovican Xiyangshan Formation. Based on lithogeochemical analysis, trenching and drilling, this study summarized the geological features and genesis of the Dongshanwu gold deposit. The results show that the gold-rich mudstone of the Yinzhubu Formation provided ore-forming material for the formation of gold deposit. Extensional fault crosses through the mudstone of the Yinzhubu Formation, or interface between argillaceous limestone and mudstone of the Yinzhubu Formation, defining the low-grade gold orebodies. Through analysis of Au mineralization characteristics, metallogenic structure, metallogenic geological body, and Au source in the Dongshanwu area, it can be preliminarily concluded that the Dongshanwu gold deposit is a micro-fine disseminated gold deposit, with the tectonic rock superimposed and metasomatized by distal low-temperature hydrothermal solution.
The gold deposit in the Dongshanwu area of Ningguo City, Anhui Province, is tectonically located in the Xianxia fold belt in the northeastern section of Qinzhou-Hangzhou metallogenic belt. Extensional fault-controlled deposit occurs mainly in tectonic breccia. Wall rock consists of mudstone of early Ordovician Yinzhubu Formation and muddy limestone interbedded with lentoid microlite limestone of Cambrian-Ordovican Xiyangshan Formation. Based on lithogeochemical analysis, trenching and drilling, this study summarized the geological features and genesis of the Dongshanwu gold deposit. The results show that the gold-rich mudstone of the Yinzhubu Formation provided ore-forming material for the formation of gold deposit. Extensional fault crosses through the mudstone of the Yinzhubu Formation, or interface between argillaceous limestone and mudstone of the Yinzhubu Formation, defining the low-grade gold orebodies. Through analysis of Au mineralization characteristics, metallogenic structure, metallogenic geological body, and Au source in the Dongshanwu area, it can be preliminarily concluded that the Dongshanwu gold deposit is a micro-fine disseminated gold deposit, with the tectonic rock superimposed and metasomatized by distal low-temperature hydrothermal solution.
引文
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[20] 谢桂青,韩颖霄,毛景文.长江中下游成矿带丰山矿田发现新类型金矿——远端浸染型金矿床[J].矿产地质,2017,36(1):265-268.
[21] 龙刚,黄萍,林剑怀,等.徐州地区寒武系豹皮灰岩的岩性特征及其成因机制分析[J].地质学刊,2013,37(1):67-70.
[22] 陈少青.广东省揭西县金坑铜锡铅锌多金属矿床成因探讨[J].华东地质,2017,38(4):271-278.
[23] HUSTON D L,LARGE R R.A chemical model for the concentration of gold in volcanogenic massive sulphide deposits [J].Ore Geology Reviews,1989,4(3):171-200.
[2] 董会明.安徽省宁国县东山坞化探异常三级查证简报[R].黄山:安徽省地质矿产勘查局332地质队,1989.
[3] 傅建真,许红兵,朱瑞,等.安徽省宁国市东山坞金多金属矿预查地质报告[R].黄山:安徽省地质矿产勘查局332地质队,2007.
[4] 章贤能,寇尚文.安徽宁国张村地区锑矿床控制因素及成因[J].地质学刊,2017,41(2):183-191.
[5] 杨明桂,梅勇文.钦—杭古板块结合带与成矿带的主要特征[J].华南地质与矿产,1997,9(3):52-59.
[6] 徐志刚,陈毓川,王登红,等.中国成矿区带划分方案[M].北京:地质出版社,2008:133-135.
[7] 骆学全,孙建东,班宜忠,等.华东片区Ⅳ级成矿单元划分及成矿地质特征[J].资源调查与环境,2015,36(3):157-164.
[8] 安徽省地质矿产局区域地质调查队.安徽省地层志[M].合肥:安徽科学技术出版社,1983.
[9] 李玉发,姜立富,孙乘云,等.安徽省岩石地层划分对比研究[M].武汉:中国地质大学出版社,1997.
[10] 杨明桂,王光辉,徐梅桂,等.江西省及邻区滨太平洋构造活动的基本特征[J].华东地质,2016.37(1):10-18.
[11] 储东如,吴跃东,刘家云,等.1∶5万河沥溪幅区域地质调查说明书[R].合肥:安徽省区域地质调查所,1995.
[12] 唐永成,曹静平,支利庚,等.皖东南区域地质矿产评价[M].北京:地质出版社,2010.
[13] 陈雪霏,汪应庚,孙卫东,等.皖南宁国竹溪岭地区花岗岩锆石U-Pb年代学及地球化学及其成因研究[J].地质学报,2013,87(11):1662-1678.
[14] 章贤能,寇尚文,刘艾华.安徽宁国东山坞地区土壤地球化学特征与评价[J].物探与化探,2017:41(1):71-78.
[15] 迟清华,鄢明才.应用地球化学元素丰度数据手册[M].北京:地质出版社,2007:108-109.
[16] 龚庆杰.《地球化学多元统计分析》课程教学探讨[J].中国地质教育,2012,21(3):110-113.
[17] 陈琼林,乔新庄,郝国胜.皖南震旦—寒武纪黑色岩系贵金属含矿性研究[R].黄山:安徽省地质矿产勘查局332地质队,1992.
[18] 方捷,张晓东,张定源,等.安徽霍山县东溪—南关岭金矿土壤化探的数学地质分析[J].华东地质,2016,37(4):284-290.
[19] 叶天竺,吕志成,庞振山,等.勘查区找矿预测理论与方法[M].北京:地质出版社,2014:1-150.
[20] 谢桂青,韩颖霄,毛景文.长江中下游成矿带丰山矿田发现新类型金矿——远端浸染型金矿床[J].矿产地质,2017,36(1):265-268.
[21] 龙刚,黄萍,林剑怀,等.徐州地区寒武系豹皮灰岩的岩性特征及其成因机制分析[J].地质学刊,2013,37(1):67-70.
[22] 陈少青.广东省揭西县金坑铜锡铅锌多金属矿床成因探讨[J].华东地质,2017,38(4):271-278.
[23] HUSTON D L,LARGE R R.A chemical model for the concentration of gold in volcanogenic massive sulphide deposits [J].Ore Geology Reviews,1989,4(3):171-200.