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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Carbon dioxide diffuse emission at the Tolhuaca hydrothermal system (Chile) controlled by tectonics and topography
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Carbon dioxide diffuse emission at the Tolhuaca hydrothermal system (Chile) controlled by tectonics and topography

机译：通过构造和地形控制的托牙卡热水系统（智利）的二氧化碳弥漫声发射

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The Tolhuaca hydrothermal system is one of the few attested geothermal resources in Chile. While recent investigations provided some insights into the depth and temperature of the geothermal reservoirs and the chemical and mineralogical evolution of the hydrothermal system, little is still known about the CO2 degassing of the system and the local and shallow control of fluid pathways. Here, we document the soil CO2 degassing and soil temperature distributions in the southern part of the Tolhuaca hydrothermal system and at one of its northern fumaroles, and provide a first estimate of its total CO2 release. The surveyed area is responsible for a total CO2 emission of up to 30 t d(-1). Hydrothermal CO2 emissions (similar to 4-27 t d(-1)) are mostly restricted to the thermal manifestations or generally distributed along NNW trending lineaments, sharing the same orientation as the volcanic vents and thermal springs and fumaroles. Hydrothermal CO2 fluxes, fumaroles and thermal springs are generally encountered in topographic lows, in close vicinity of streams and often in clay-rich pyroclastic units, highlighting a relation between landscape evolution and the activity of the hydrothermal system. We suggest that glacial unloading and incision of the stream inside the clay-rich units have likely enhanced locally the permeability, creating a preferential pathway for the migration of deeper fluid to the surface. As several hydrothermal systems in the Andes are found on the flank of volcanoes hosting glaciers, we propose that they could have had a similar development to that of the Tolhuaca hydrothermal system. (C) 2021 The Author(s). Published by Elsevier B.V.
机译：托洛瓦水热系统是智利的少数证明地热资源之一。虽然最近的调查提供了一些关于地热储层的深度和温度的见解以及水热系统的化学和矿物学演化，但仍然仍然符合系统的二氧化碳脱气以及流体途径的局部和浅控制。在此，我们记录托洛卡水热系统南部的土壤二氧化碳脱气和土壤温度分布，并在其北方富马族的一部分中，并提供其总二氧化碳释放的第一估计。受测量的区域负责总二氧化碳排放至30td（-1）。水热量二氧化碳排放（类似于4-27天（-1））主要限于沿着NNW趋势谱系的热表现或通常分布，共享与火山通风口和热弹簧和富纹的相同方向。水热量CO 2助熔剂，浮石和热弹簧通常在地形低点中遇到，靠近溪流附近，通常是富含粘土的发球菌，突出景观演化与水热系统的活性之间的关系。我们建议在富含富含粘土的单位内部的冰川卸载和切口在本地的透气性上可能增强，从而产生优先途径，用于将更深的流体迁移到表面。由于在霍尔斯的侧翼上发现了雅迹中的几个水热系统，我们提出了它们可以对托洛瓦水热系统的发展具有类似的发展。 （c）2021提交人。 elsevier b.v出版。

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