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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >The Alteration Box Plot: A Simple Approach to Understanding the Relationship between Alteration Mineralogy and Lithogeochemistry Associated with Volcanic-Hosted Massive Sulfide Deposits
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The Alteration Box Plot: A Simple Approach to Understanding the Relationship between Alteration Mineralogy and Lithogeochemistry Associated with Volcanic-Hosted Massive Sulfide Deposits

机译：蚀变箱图：了解蚀变矿物学与火山岩质块状硫化物矿床相关的岩石地球化学之间关系的一种简单方法

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摘要

Zonal alteration is a common feature in volcanic rocks surrounding sea-floor massive sulfide deposits. Alteration indexes, such as the Ishikawa alteration index (AI) and the chlorite-carbonate-pyrite index (CCPI), have been developed to measure the intensity of sericite, chlorite, carbonate, and pyrite replacement of sodic feldspars and glass associated with hydrothermal alteration proximal to the orebodies. In this paper a simple graphical representation of the Ishikawa AI plotted against the CCPI, termed the "alteration box plot," is used to characterize the different alteration trends related to massive sulfide ores and to assist in the distinction of volcanic-hosted massive sulfide (VHMS)-related hydrothermal alteration from regional diagenetic alteration. Although there are some limitations with the technique, a series of ease studies are used to demonstrate that the alteration box plot is a powerful means of understanding the relationship between mineralogy, lithogeochemistry, and intensity of alteration in zoned alteration systems related to VHMS deposits and should assist the exploration geologist in determining vectors to the center of the ore system.
机译：带状蚀变是海底块状硫化物矿床周围火山岩的共同特征。已开发出诸如石川蚀变指数（AI）和亚氯酸盐-碳酸盐-黄铁矿指数（CCPI）的蚀变指数，以测量与水热蚀变相关的苏打长石和玻璃的绢云母，绿泥石，碳酸盐和黄铁矿置换的强度。靠近矿体。在本文中，石川AI针对CCPI绘制的简单图形表示称为“变更箱图”，用于表征与块状硫化物矿石有关的不同蚀变趋势，并有助于区分火山岩中的块状硫化物（ VHMS）相关的热液蚀变，来自区域成岩作用。尽管该技术存在一些局限性，但通过一系列易用性研究表明，蚀变箱图是了解矿物学，岩性化学和与VHMS矿床相关的分区蚀变系统中蚀变强度之间关系的有力手段。协助勘探地质学家确定到矿石系统中心的向量。

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