【摘要】 岩石学基本特征和地球化学资料说明,湘中禾青中上泥盆统碳酸盐岩属于台地相区,并可细分为潮坪(包括浑水潮坪与清水潮坪)、粒屑滩、生物礁、局限海湾和潮下风暴岩五个微相。剖面对比说明区内以大乘山为界发生沉积分异,其北边为局限台地,南边为开阔台地。区内的局限台地相带为成矿提供了大量而足够的矿质,禾青生物礁相在物质与环境上为成矿提供了必要条件而成为聚矿微相,生物礁相的高孔隙率加上其下的浑水潮坪页岩为成矿提供了充分必要条件。更多还原

【Abstract】 Petrological and geochemical sdudies show that the middle-upper Devonian carbonate rocks in Heqing district belong to platform facies,and can be divided into five microfacies:tidal-flat(including muddy water and clear water),biostrome,bioherm,restricted gulf and subtidal tempestite.The comparison among the profiles suggests that there is sedimentary differentiation in the district along the boundary of Dachengshan,north of which is restricted-semi-restricted platform,and the south open platform.The restricted platform facies area provided large quantity of ore-forming material,the bioherm in Heqing provided essential ore-forming condition in meterial and enironment and became metal-accumulating microfacies.The high porosity of bioherm facies and the underlying muddy water tidalflat shale offered ample condition for the formation of ore deposit.更多还原