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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Water and dissolved gas geochemistry at Coatepeque, Ilopango and Chanmico volcanic lakes (El Salvador, Central America)
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Water and dissolved gas geochemistry at Coatepeque, Ilopango and Chanmico volcanic lakes (El Salvador, Central America)

机译：Coatepeque，Ilopango和Chanmico火山湖（中美洲萨尔瓦多）的水和溶解气体地球化学

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摘要

Coatepeque (on the E slope of Santa Ana Volcano), Ilopango (inside Ilopango Caldera) and Chanmico (associated with San Salvador Volcano) are volcanic lakes in El Salvador, showing a thermocline at a relatively shallow depth (from 30 to 40 m, from 20 to 40 m and from 5 to 15 m depth, respectively) and anoxic conditions below 33, 24 and 4 m depth, respectively. The Na+ -Cl- composition of the Coatepeque and Ilopango lakes, displaying TDS values up to 1226 and 1216 mg/L, respectively, is likely due to hydrothermal fluids that feed these two lakes, as also confirmed by Cl /Br molar ratios = 650, high As, B, Li and Si contents and Cl /SO42 ratio 1. The Mg2+-HCO3 water composition of Lake Chanmico, whose TDS values were between 566 and 856 mg/L, suggests water-rock interaction processes with mafic/ultramafic rocks variably affected by serpentinization processes, which produced high Mg2+, Si and B concentrations. Waters at depth were characterized by the presence of CO2 from an extra-lacustrine source, as suggested by delta(13) C-CO2 values significantly less negative than those typically related to biogenic processes, albeit this gas was found in smaller quantities when compared to those recorded in other meromictic lakes hosted in quiescent volcanic systems (e.g. Lake Kivu in DRC, Monticchio, Albano and Averno lakes in Italy, Hule and Rio Cuarto lakes in Costa Rica, Lake Pavin in France). The occurrence of CH4, whose concentrations in lake Chanmico were up to two orders of magnitude higher than those recorded in Coatepeque and Ilopango lakes, suggests bacterial methanogenesis. (C) 2019 Elsevier B.V. All rights reserved.
机译：Coatepeque（在圣安娜火山E坡上），Ilopango（在Ilopango Caldera内部）和Chanmico（与San Salvador火山相关）是萨尔瓦多的火山湖，显示了一个相对较浅深度（从30到40 m，从深度分别为20至40 m和5至15 m）和低于33、24和4 m深度的缺氧条件。 Coatepeque和Ilopango湖的Na + -Cl-组成分别显示高达1226和1216 mg / L的TDS值，这可能是由于向这两个湖供热的热液引起的，Cl / Br摩尔比也证实了这一点650，高的As，B，Li和Si含量，Cl / SO42比>1。ThomsonTDM值在566和856 mg / L之间的尚米科湖Mg2 + -HCO3水组成表明，镁铁质/蛇纹岩化过程会不同程度地影响超镁铁质岩石，产生高浓度的Mg2 +，Si和B。如delta（13）所示，深层水的特征是存在湖外水源的CO2，其C-CO2值的负值远低于通常与生物过程有关的负值，尽管与静止火山系统中的其他淡紫色湖泊中记录的盐（例如，刚果（金）的基伍湖，意大利的蒙蒂基奥，阿尔巴诺和阿维诺湖，哥斯达黎加的呼啦湖和里奥夸尔托湖，法国的帕文湖）。 CH4的发生比在Coatepeque和Ilopango湖中记录的高4个数量级，CH4在Chanmico湖中的浓度高，这表明细菌甲烷生成。 （C）2019 Elsevier B.V.保留所有权利。

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    Cabassi J.; Capecchiacci F.; Magi F.; Vaselli O.; Tassi F.; Montalvo F.; Esquivel I.; Grassa F.; Caprai A.;

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    Univ Florence, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy|CNR, Ist Geosci & Georisorse, Via G La Pira 4, I-50121 Florence, Italy;

    Univ Florence, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy|CNR, Ist Geosci & Georisorse, Via G La Pira 4, I-50121 Florence, Italy;

    Univ Florence, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy|Univ Pisa, Dipartimento Sci Terra, Via Santa Maria 53, I-56126 Pisa, Italy;

    Univ Florence, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy|CNR, Ist Geosci & Georisorse, Via G La Pira 4, I-50121 Florence, Italy;

    Univ Florence, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy|CNR, Ist Geosci & Georisorse, Via G La Pira 4, I-50121 Florence, Italy;

    Minist Medio Ambiente & Recursos Nat, Kilometro 5 1-2 Carretera Santa Tecla, San Salvador, El Salvador;

    Minist Medio Ambiente & Recursos Nat, Kilometro 5 1-2 Carretera Santa Tecla, San Salvador, El Salvador;

    Ist Nazl Geofis & Vulcanol, Sez Palermo, Via Ugo La Malfa 153, I-90146 Palermo, Italy;

    CNR, Ist Geosci & Georisorse, Via G Moruzzi 1, I-56124 Pisa, Italy;

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  • 正文语种 eng
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  • 关键词

    Volcanic lakes; El Salvador; Water geochemistry; Dissolved gas geochemistry; Stable isotopes; Unusual chemical compositions;

    机译：火山湖;萨尔瓦多;水地球化学;溶解气体地球化学;稳定同位素;化学组成异常;

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