SEDEX型矿床中电气石岩的地质特征及找矿意义

电气石岩是一种富硼的硅质喷气岩,主要产于以沉积岩为容矿岩石的喷气矿床中及附近。研究广泛认为其与喷流-沉积型块状硫化物矿床(SEDEX矿床)有着密切的关系,并被视为该类矿床找矿勘探的标志岩性之一。综述了电气石岩的产出环境、形态、岩石学、地球化学等地质特征,分析了电气石岩的沉积环境及成因。以澳大利亚布罗肯希尔地区电气石岩与矿化的关系为例,对其地质找矿意义进行了总结与展望。

Geological characteristics and its prospecting significance of the tourmalines in SEDEX-type deposit

The tourmaline is a kind of boron-rich siliceous exhalite, mainly developing in and near the jet deposit whose host rock is sedimentary rock. It has been widely accepted that the tourmaline has close relationship with the massive sulfide deposits of Sedimentary Exhalative (SEDEX) type and is seen as a lithological indicator for prospecting and exploring deposit of this kind. In this paper, the relationship between the tourmalines and mineralization in the area of Broken Hill in Australia was taken as an example for comprehensively analyzing the production environment, geological form, petrological and geochemical features of the tourmalines. Its sedimentary environment and genesis were also discussed to summarize the geological prospecting significance of the area.