安徽庐江龙桥铁矿层新资料及成矿作用多阶段演化模式  

NEW DATA AND EVOLUTIONARY MODEL OF POLYMINERALIZATION FOR THE LONGQIAO IRON DEPOSIT,LUJIANG,ANHUI

作　　者：倪若水[1] 吴其切[1] 汪祥云 吴明安 张千明 

机构地区：[1]南京地质矿产研究所 [2]安徽省地质矿产局327地质大队

出　　处：《地质论评》1994年第6期565-575,共11页Geological Review

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.

关 键 词：中三叠世 含矿层位 铁矿床 成矿作用 

分 类 号：P618.310.5[天文地球—矿床学]