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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Fault-controlled geothermal fluids of the northern Trans-Mexican Volcanic Belt: A geochemical and isotopic study of the Los Geysers field (Valley of Queretaro, Mexico)
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Fault-controlled geothermal fluids of the northern Trans-Mexican Volcanic Belt: A geochemical and isotopic study of the Los Geysers field (Valley of Queretaro, Mexico)

机译：跨墨西哥火山带北部断裂控制的地热流体：Los Geysers油田（墨西哥克雷塔罗河谷）的地球化学和同位素研究

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摘要

This study focuses on the geochemical and isotopic composition of natural spring waters and gases discharging at Los Geysers thermal area (northern Trans-Mexican Volcanic Belt, TMVB) and its relations to the regional tectonic framework. Water is of Na-HCO3 type and samples were collected at temperatures ranging from 48 degrees C to 98 degrees C and pH from 6.8 to 9.3. Stable isotope compositions (-10.0 to -8.0%. for delta O-18 and -75.6 to -69.7%0 for delta D) deviate from the global and local meteoric lines suggesting fractionation by steam loss The Sr-87/Sr-86 values of the thermal waters range from 0.70664 to 0.70698 indicating that most of the strontium comes from the dissolution of carbonate belonging to the late Berriasian to early Valanginian in the Guanajuato conglomerate group and a minor component of less radiogenic Sr from Paleogene-Neogene volcano-sedimentary and volcanic rocks. Solute geothermometers reveal a reservoir temperature around 164 degrees C. A mixture between air and hydrothermal CO2 composes the bubbling gases. Helium isotopes data (R/Ra = 0.96-1.71) and He-4/Ne-20 ratios (0.53-9.41) reveal that helium is dominated by a radiogenic component with a considerable mantle-He contribution (up to 20.8%). Since there is no active volcanism at the northern TMVB, mantle-He is best explained by transport of volatiles along active faults reaching the crust-mantle boundary. The conceptual hydrogeochemical model involves a thermal aquifer at similar to 1000m depth which is recharged by regional meteoric water flow, a high thermal gradient (similar to 153 degrees C/km) and fast fluid upflow to the surface along discontinuities related to regional horst and graben tectonics. (C) 2019 Elsevier B.V. All rights reserved.
机译：这项研究的重点是在Los Geysers热区（北跨墨西哥火山带，TMVB）排放的天然泉水和天然气的地球化学和同位素组成及其与区域构造框架的关系。水为Na-HCO3类型，样品的温度范围为48摄氏度至98摄氏度，pH值为6.8至9.3。稳定的同位素组成（δO-18为-10.0至-8.0％，δD为-75.6至-69.7％0）与整体和局部流变线不同，表明通过蒸汽损失进行分馏Sr-87 / Sr-86值热水的范围从0.70664到0.70698，表明大多数锶来自于瓜纳华托砾岩群中属于Berriasian晚期至Valanginian的碳酸盐的溶出，以及来自古近纪-新近纪火山沉积和火山岩。溶质地热仪显示出储层温度约为164摄氏度。空气和热液CO2之间的混合物构成了鼓泡气体。氦同位素数据（R / Ra = 0.96-1.71）和He-4 / Ne-20比率（0.53-9.41）表明，氦由具有显着地幔-He贡献的放射成因成分占主导（高达20.8％）。由于北部TMVB上没有活火山，因此最好用沿活动断层到达地幔幔边界的挥发物运移来解释幔-赫。概念性水文地球化学模型涉及一个深度约为1000m的地热层，并由区域性的水流补给，高的温度梯度（约153摄氏度/公里）以及快速的流体沿与区域性地热和grab陷有关的不连续性向上流到地表构造学。 （C）2019 Elsevier B.V.保留所有权利。

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