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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, δ (18)~O, δD, δ (13)~C and (87)~Sr/(86)~Sr
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Evolution of the geothermal fluids at Los Azufres, Mexico, as traced by noble gas isotopes, δ (18)~O, δD, δ (13)~C and (87)~Sr/(86)~Sr

机译：稀有气体同位素δ（18）〜O，δD，δ（13）〜C和（87）〜Sr /（86）〜Sr示踪的墨西哥洛斯阿兹夫雷斯地热流体演化

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摘要

Isotopes of noble gases, CO_2, H_2O and Sr were measured in 10 geothermal wells and 8 hot springs, fumaroles and mud volcanoes at Los Azufres, the second most important geothermal field in Mexico. The aim of this study is to provide additional information on fluid circulation in the field and surrounding areas (Araro hot springs), as well as on physical processes such as boiling, steam separation and invasion of re-injected brines following over 25 years of geothermal fluid exploitation. Mantle helium dominates in fluids from the northern production zone of Maritaro, with measured 3~He/4~He ratios up to 7 Ra (where Ra is the atmospheric ratio of 1.386 × 10-6). 3~He/4~He ratios are positively correlated with (87)~Sr/(86)~Sr ratios and with δD and δ (18)~O. These relationships suggest that Los Azufres fluids represent a mixing between primary magmatic 3~He-rich fluids and groundwater currently discharging at Araro hot springs and enriched in radiogenic 4~He acquired from Miocene andesites. Unusually high He ratios together with radiogenic Sr isotopic ratios suggest that thermal waters acquired mantle He from deep-seated parent magmas and radiogenic Sr possibly during their uprising through the metamorphic basement. (40)~Ar/(36)~Ar ratios of 366 to 429 measured in two wells indicate either mantle-derived argon or a radiogenic (40)~Ar in situ component, suggesting the local presence of an older crust-al fluid component in the northern part of the field. Ne, Kr and Xe are entirely of atmospheric origin, but processes of boiling, steam separation and re-injection of used brines have led to fractionation of their elemental abundances. Comparison with previous studies suggests that the boiling zone in the northern production zone is currently extending further north (Maritaro hot springs). In the southwestern productive zone, re-injected brines might account for more than 90% of the exploited fluids.
机译：在墨西哥第二重要的地热田Los Azufres的10个地热井和8个温泉，喷气孔和泥火山中测量了稀有气体，CO_2，H_2O和Sr的同位素。这项研究的目的是提供有关野外和周边地区（阿拉罗温泉）的流体循环以及物理过程（如沸腾，蒸汽分离和经过25年地热历程的再注入盐水入侵）的其他信息。流体开采。地幔氦在来自Maritaro北部生产区的流体中占主导地位，测得的3〜He / 4〜He比率最高为7 Ra（其中Ra为1.386×10-6的大气比率）。 3〜He / 4〜He比值与（87）〜Sr /（86）〜Sr比值以及δD和δ（18）〜O呈正相关。这些关系表明，Los Azufres流体代表了富含岩浆的3〜He流体与目前在Araro温泉中排放的地下水之间的混合，并富含从中新世安山岩中获取的放射成因4〜He。异常高的He比率和放射性Sr同位素比率表明，热水可能是在它们通过变质基底起义期间从深部母岩浆和放射性Sr获得地幔He的。在两个井中测得的（40）〜Ar /（36）〜Ar比值介于366至429之间，表明地幔衍生的氩气或原位成因的（40）〜Ar放射源，表明局部存在较老的地壳流体成分在田野的北部。 Ne，Kr和Xe完全来自大气，但沸腾，蒸汽分离和用过的盐水重新注入的过程导致了其元素丰度的分级分离。与先前研究的比较表明，北部生产区的沸腾区目前正在向北延伸（玛丽塔罗温泉）。在西南生产区，注入的盐水可能占开采液的90％以上。

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    D.L. Pinti; M.C. Castro; O. Shouakar-Stash; A. Tremblay; V.H. Garduno; C.M. Hall; J.-F. Helie; B. Ghaleb;

  • 作者单位

    GEOTOP and Departement des Sciences de la Terre et de l'Atmosphere, Universite du Quebec a Montreal, CP888, Succ. Centre-Ville, Montreal, QC, Canada;

    Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Ml, USA;

    Department of Earth and Environmental Sciences, University of Waterloo, ON, Canada;

    GEOTOP and Departement des Sciences de la Terre et de l'Atmosphere, Universite du Quebec a Montreal, CP888, Succ. Centre-Ville, Montreal, QC, Canada;

    UMSNH-IIM, Departimento de Geologia y Mineralogia, Morelia, Michoacan, 58060, Mexico;

    Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Ml, USA;

    GEOTOP and Departement des Sciences de la Terre et de l'Atmosphere, Universite du Quebec a Montreal, CP888, Succ. Centre-Ville, Montreal, QC, Canada;

    GEOTOP and Departement des Sciences de la Terre et de l'Atmosphere, Universite du Quebec a Montreal, CP888, Succ. Centre-Ville, Montreal, QC, Canada;

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  • 正文语种 eng
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  • 关键词

    noble gases; strontium isotopes; helium isotopes; geothermal energy; los azufres; araro; mexico;

    机译：稀有气体锶同位素;氦同位素地热能洛斯阿祖夫雷斯;阿拉罗墨西哥;

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