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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina
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Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina

机译：阿根廷野生菊 - 科普苏（CCVC）浅水地球化过程的结构控制

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摘要

The Caviahue-Copahue Volcanic Complex (CCVC) hosts one of Argentina's most important geothermal systems. To provide new insights into origin, circulation, and residence time of fluids, the chemical and isotopic composition (He-3/He-4, delta H-2-delta O-18 in H2O; delta C-13-delta O-18 in CO2; Sr-87/Sr-86) of thermal waters was measured together with the H-3 and C-14 activities. Water samples were collected from hot springs (LM, TC, LMM, CB and AF) representing the five major thermal zones of the CCVC and assumed to be steam-heated meteoric waters, and a well condensate (COP-2). The LMM, CB, and AF chemical composition and Sr-87/Sr-86 ratios show that water chemistry is acquired locally from exchange with volcanic rocks (Sr, SiO2, among others) and from steam (H2S). Two surface geothermal manifestations (LM and TC), along with the well condensate, COP-2, contain a higher contribution of deep originating fluids, with Sr-87/Sr-86 indicating possible contribution from deep-seated granitoids or sediments from the underlying basement. Radiocarbon-based residence times indicate ages ranging between 13,540 and 17,520 yrs. BP, representing the minimum age for the geothermal reservoir waters. Tritium is mainly absent in hot spring waters except for LMM and CB where the activity is close to the detection limit. This indicates a minimum age older than 70 yrs. for the water circulating in the shallow circuit. This result suggests that shallow meteoric water have a more complex and/or deeper circuit, resulting in older residence times. Helium isotopes in the CCVC span a wide range, from a pure mantle-derived value, of 8.35Ra, to a more crustal radiogenic signature, of 4.6Ra. The spatial variation is explained by associating the geochemical data with the geological context, which includes the distribution of fault-fracture meshes and different sources of magmatic volatiles underlying the Copahue volcano. The first order control on helium isotope signatures observed in this study seems to be dominated by the degree of crustal assimilation of the magmatic sources, which is in turn controlled by the local arrays of faults. (C) 2021 Published by Elsevier B.V.
机译：Caviahue-Copahue火山复合体（CCVC）举办阿根廷最重要的地热系统之一。提供新的洞察流体的起源，循环和停留时间，化学和同位素组合物（He-3 / He-4，ΔH-2-Delta O-18在H2O; Delta C-13-Delta O-18在CO2; SR-87 / SR-86）热水与H-3和C-14活性一起测量。从热弹簧（LM，TC，LMM，CB和AF）收集水样，代表CCVC的五个主要热带，并假设是蒸汽加热的陨石水，以及浓缩液（COP-2）。 LMM，CB和AF化学成分和SR-87 / SR-86比率表明，在与火山岩（SR，SiO 2等）和蒸汽（H2S）的交换中，从交换中获取水化学。两个表面地热表现（LM和TC）以及孔冷凝物COP-2含有较高的深度源液的贡献，具有SR-87 / SR-86，表明可能从潜在的深层花岗岩或沉积物的可能贡献地下室。基于RadioCarbon的停留时间表明，年龄在13,540至17,520岁之间。 BP，代表地热储层水域的最低年龄。除了LMM和CB之外，氚主要在热弹簧水中缺席，其中活动接近检测限。这表明最低年龄超过70岁。用于在浅电路中循环的水。这结果表明，浅陨水具有更复杂和/或更深的电路，导致较旧的停留时间。 CCVC中的氦同位素跨越宽范围，从8.35ra的纯地幔衍生值，4.6ra的地壳辐射签名。通过将地球化学数据与地质背景相关联来解释空间变化，该地质数据包括在共加持火山上的岩壁挥发物的分布和不同岩浆挥发物的不同来源。本研究中观察到的氦同位素签名的第一个顺序控制似乎是岩石源的地壳同化程度的主导，其又由局部断层阵列控制。 （c）由elsevier b.v发布的2021年

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2021年第6期|107228.1-107228.12|共12页
  • 作者

    Tardani Daniele; Roulleau Emilie; Pinti Daniele L.; Perez-Flores Pamela; Daniele Linda; Reich Martin; Sanchez-Alfaro Pablo; Morata Diego; Richard Luc;

  • 作者单位

    Univ Austral Chile Inst Ciencias Tierra Valdivia Chile|Univ Chile Andean Geothermal Ctr Excellence CEGA Santiago Chile;

    Stratagem974 St Clotilde Reunion France|Univ La Reunion Lab Geosci Reunion F-97744 St Denis France;

    Univ Quebec Montreal Geotop Montreal PQ Canada|Univ Quebec Montreal Dept Sci Terre & Atmosphere Montreal PQ Canada|Chinese Acad Sci Northwest Inst Ecoenvironm & Resources Key Lab Petr Resources Lanzhou 730000 Gansu Peoples R China|Gansu Talent & Intelligence Ctr Remediat Closed & Lanzhou 730000 Peoples R China;

    Consultoria & Invest Geol Ambiental Ltd Huasco Chile;

    Univ Chile Andean Geothermal Ctr Excellence CEGA Santiago Chile|Univ Chile Fac Ciencias Fis & Matemat Dept Geol Santiago 8370450 Chile;

    Univ Chile Andean Geothermal Ctr Excellence CEGA Santiago Chile|Univ Chile Fac Ciencias Fis & Matemat Dept Geol Santiago 8370450 Chile;

    Univ Austral Chile Inst Ciencias Tierra Valdivia Chile|Univ Chile Andean Geothermal Ctr Excellence CEGA Santiago Chile;

    Univ Chile Andean Geothermal Ctr Excellence CEGA Santiago Chile|Univ Chile Fac Ciencias Fis & Matemat Dept Geol Santiago 8370450 Chile;

    Univ Quebec Montreal Geotop Montreal PQ Canada|Univ Quebec Montreal Dept Sci Terre & Atmosphere Montreal PQ Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Helium isotopes; Radiocarbon; Tritium; Strontium isotopes; Copahue volcano; Geothermal systems;

    机译：氦同位素;radiocarbon;氚;锶同位素;切割火山;地热系统;

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