Crustal Permeability
Crustal Permeability
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地壳渗透率
DOI：
10.1002/9781119166573.ch17
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Cann J
中科院分区：
文献类型：
--
作者：
Cann J
塞浦路斯特罗多斯蛇绿岩中广泛分布着前黑烟热液系统的深层。本章概述了特罗多斯绿帘岩带的场关系。它讨论了使用扫描电子显微镜和阴极发光对特罗多斯绿帘岩进行的新岩相学研究。特罗多斯蛇绿岩中的绿帘岩和蚀变较小的岩脉都严重缺乏富含大量硫化物矿床的金属。如果像人们普遍认为的那样，渗透率仅限于裂缝，那么在体积扩散极其缓慢的温度 <400°C 下，原生矿物中的成分就很难释放到流体中。反应渗透性提供了一种快速完全重结晶的机制，使流体能够进入岩石的所有部分。在这方面，它可能是岩石圈和海洋-大气系统之间的成分交换以及俯冲带成分再循环回地幔的关键部分。
The deep levels of former black smoker hydrothermal systems are widespread in the Troodos ophiolite in Cyprus. This chapter presents an overview of field relationships in the epidosite zones of Troodos. It discusses new petrographic studies of Troodos epidosites, using scanning electron microscopy and cathodoluminescence. Both epidosites and less altered dikes in the Troodos ophiolite are strongly depleted in the metals that are enriched in massive sulfide deposits. If permeability is restricted to cracks as is widely assumed, it is extremely difficult for components in primary minerals to be released into the fluid at temperatures <400° C where volume diffusion is extremely sluggish. Reaction permeability provides a mechanism for rapid complete recrystallization, with access of fluid to all parts of the rock. In this respect, it may be a key part of the exchange of components between the lithosphere and the ocean‐atmosphere system and the recycling of components back into the mantle at subduction zones.