| 长江中下游某些火山岩铁矿微量元素的地球化学 |
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| 引用本文：张荣华,刘隆隆,陆成庆.1979.长江中下游某些火山岩铁矿微量元素的地球化学[J].地球学报,1(1):83-103. |
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| 中文摘要:<正> 一、地质概况 长江中下游发育一些中生代陆相火山岩断陷盆地。其中庐枞、宁芜和繁昌等盆地内均发现有铁矿。在铁矿体及蚀变围岩内多种微量元素,均具有明显的垂直分带现象。这种分带规律既说明了成矿条件的特点,又显示了找矿标志的意义。 庐枞盆地的罗河铁矿作为一个大型隐伏铁矿床,它的蚀变和金属原生分带,在玢岩铁矿床中更有典型意义。该盆地内的钾玄岩—粗安岩—粗面岩组合,可划分三个旋回,由早至晚,称为砖桥组、双庙组和浮山组。其中第一旋回是含矿旋回。罗河铁矿与成矿有关的是粗安岩和粗安质凝灰岩。 |
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| ON GEOCHEMISTRY OF TRACE ELEMENTS OF SEVERAL PORPHYRITE IRON DEPOSITS ALONG THE MIDDLE LOWRE CHANGJIANG VALLEY |
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| Abstract:This paper deals with trace elements in iron deposits and their altered country rocks inthe volcanic area: statistical analysis is applied to discover the rules governing the migrationsof trace elements and trace element groups. Detailed study shows that the trace element groupsdistribute in the following succession (from outside toward the ore body):1. First chalcophile element group-Cu. Zn and Mn;2. (Ti. V) and Sr;3. Second chalcophile element group-Pb. and (Ag, Cu);4. Co. Ni and Mo, near the iron ore body. The cause of trace element zoning is that: as trace elements migrate in solution its zoning depends upon the volatility of compounds of trace elements. The sequence of volatility which ranks from high to low, lgH2O=+3, lgHCl=+1, lg∑S=1 and 427℃, is given as follow: Sn-Zn-Pb-Mn-Fe-Cu-Mo-Ag As trace elements are precipitaled from solution their zoning depends upon the solubility product of the sulfides of these trace elements in aqueous solution. This is a sequence of solubility product constants, starting with the most soluble (at 0℃-400℃) ZnS>PbS>CuS>CuS2>AgS In addition, analyzing the rules governing the migrations of trace elements indicates that the metals in the iron ore body are concentrated by metasomatism, which causes the withdraw of iron and trace elements from host rocks and forms ore body. |
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