安徽庐江龙桥铁矿层新资料及成矿作用多阶段演化模式
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摘要
根据龙桥铁矿层位岩性、地球化学特征及其与南京地区中三叠世周冲村期含膏岩系的对比,结合含矿层位的展市与区域构造及火山岩盆地的构造分析。论证龙桥铁矿含矿层位是中三叠世东马鞍山期(周冲村期)萨布哈-泻湖沉积环境下,含铁沉积(菱铁矿、钱白云石、磁铁矿及赤铁矿)矿源层。经燕山期岩浆侵入的热变质和热液叠加构造,成矿作用经历多阶段演化。
According to the lithology and geochemistry characters of the iron horizons ofthe Longqiao iron deposit, stratigraphic correlation with Middle TriassicZhouchongcunian gypsum-bearing rock series in the Nanjing area, coupled withthe distribution of the ore horizons and regional tectonics and a tectonic analysisof volcanic basin, it has been shown that iron horizons would be originallyiron-rich sedimentary (siderite, ankerite, magnetite, hematite) source beds, in theMiddle Triassic Ma'anshan'an (Zhouchoncunan) stage deposited in the lagoonal-sabkh sedimentary environmet. The source beds might have played an importantrole as embryo beds which have caused the preference of thermometamorphismand hydrothermal superimposition on such ?particular beds during the magmaticintrusion at the Yanshanian.
According to the lithology and geochemistry characters of the iron horizons ofthe Longqiao iron deposit, stratigraphic correlation with Middle TriassicZhouchongcunian gypsum-bearing rock series in the Nanjing area, coupled withthe distribution of the ore horizons and regional tectonics and a tectonic analysisof volcanic basin, it has been shown that iron horizons would be originallyiron-rich sedimentary (siderite, ankerite, magnetite, hematite) source beds, in theMiddle Triassic Ma'anshan'an (Zhouchoncunan) stage deposited in the lagoonal-sabkh sedimentary environmet. The source beds might have played an importantrole as embryo beds which have caused the preference of thermometamorphismand hydrothermal superimposition on such ?particular beds during the magmaticintrusion at the Yanshanian.
引文
①汪祥云等。龙桥铁矿床勘探地质报告。1991。
①孙万铃等.三叠系蒸发岩矿床.1991.
①何镜宇。沉积岩石学.1986.
②汪祥云，龙桥铁矿典型矿床剖析.1993。
①327队样品经南京地质古生物所鉴定.l992.
1 胡文瑄等.宁芜和庐枞地区陆相火山喷气沉积-热液叠加改造型铁硫矿床.北京:地质出版社,1991．
2 任启江等.安徽庐枞中生代火山构造洼地及其成矿作用.北京:地质出版社,1991．
3 刘宝珺等.岩相古地理基础和工作方法.北京:地质出版社,1985．
4 阮惠础等.长江中下游中三叠统层状-层控型铁矿床的成因.南京大学学报,1982,(3) :754-772．
5 Meinert L D. Skarn, manto and breccia pipe formation in sedimentary rocks of the Cananea Mining District, Sonora Mexico. Econ. Geol., 1982, 77(4) : 919--948．
6 黄斌.安徽铜陵地区块状硫-铁-金矿床的铅同位素特征.地质学报,1991,65(4) :347-359．
①孙万铃等.三叠系蒸发岩矿床.1991.
①何镜宇。沉积岩石学.1986.
②汪祥云，龙桥铁矿典型矿床剖析.1993。
①327队样品经南京地质古生物所鉴定.l992.
1 胡文瑄等.宁芜和庐枞地区陆相火山喷气沉积-热液叠加改造型铁硫矿床.北京:地质出版社,1991．
2 任启江等.安徽庐枞中生代火山构造洼地及其成矿作用.北京:地质出版社,1991．
3 刘宝珺等.岩相古地理基础和工作方法.北京:地质出版社,1985．
4 阮惠础等.长江中下游中三叠统层状-层控型铁矿床的成因.南京大学学报,1982,(3) :754-772．
5 Meinert L D. Skarn, manto and breccia pipe formation in sedimentary rocks of the Cananea Mining District, Sonora Mexico. Econ. Geol., 1982, 77(4) : 919--948．
6 黄斌.安徽铜陵地区块状硫-铁-金矿床的铅同位素特征.地质学报,1991,65(4) :347-359．
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