云南白牛厂沉积喷流型银多金属矿床沉积环境分析

本文通过系统的岩矿芯和地表实测岩相剖面的研究，采用多种测试手段和沉积环境分析方法，较全面地研究了白牛厂合矿地层∈２ｔａ的沉积相特征。结论认为：（１）含矿地层∈２ｔａ是由滑塌浊流沉积、深水灰岩、热水沉积、黑色页岩和滑塌碎屑流沉积五个微相构成的次深水盆地相沉积；（２）含矿盆地是一个位于裂陷海槽断裂斜坡带上部的次级断层海底凹陷。凹陷内受北台南隆上碳酸盐障壁的保护而呈一种欠补偿的深静水还原环境，有利于含矿热卤水的聚集成矿。

THE SEDIMENTARY ENVIRONMENTS OF THE BAINIUCHANG SEDEX SILVER-POLYMETALLIC DEPOSIT, YUNNAN

The sedimentary environsment of SEDEX deposits is an important basis for the theoretical study of mineral deposits and ore-searching. Based on the systematic drilling cores and litho - factes surface section, the sedimentary factes characteristics of the Bainiuchang ore- bearing strata were studied in detail. Following conclusions have been made: 1 ) The orebearing strata e was formed by the deposition of sub - deep water basin factes composed of following five micro - facies:fluxoturbidites, turbidity carbonate rocks, exhalites, black shale and elastic- flow breccia. 2) The ore- bearing basin is the secondary marine depression on the slope of aulacogen. Because of the barriage of the carbonates in the platform in the north and uplift in the south of the depression, the uncompensation stable sub--deep water reduction was favourable for the mineralization of ore- bearing hydrothermal fluid.