在野外旅行过程中会看到许多排放显示被热水蚀变岩石所环绕。这种蚀变复盖地区可以达儿英亩、研究和测绘地表热水蚀变是很有价值的,因为它有助于认识地热系统的性质。特别是它经常提供下述有关信息: 1.蚀变流体的性质根据地表蚀变现象可以推断从温泉或者火山喷气孔流出的流体的性质和定性成份。例如,在一些地区排放的流 Many of the emissions seen during the field trip are shown surrounded by hot-water altered rock. This alteration can cover up to a few acres and it is valuable to study and map surface hydrothermal alterations because it helps to understand the nature of geothermal systems. In particular, it often provides the following information: 1. Properties of altered fluids The nature and qualitative components of fluids flowing out of hot springs or volcanic jets can be inferred from surface alteration phenomena. For example, in some areas the discharge of the stream