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Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina

文献类型：期刊论文

作者Tardani, Daniele2,3; Roulleau, Emilie1,10; Pinti, Daniele L.5,6,7,9; Perez-Flores, Pamela4; Daniele, Linda2,8; Reich, Martin2,8; Sanchez-Alfaro, Pablo2,3; Morata, Diego2,8; Richard, Luc7,9
刊名JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
出版日期2021-06-01
卷号414页码:12
关键词Helium isotopes Radiocarbon Tritium Strontium isotopes Copahue volcano Geothermal systems
ISSN号0377-0273
DOI10.1016/j.jvolgeores.2021.107228
英文摘要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.
WOS关键词ISOTOPIC COMPOSITION ; CARBON-DIOXIDE ; GEOTHERMAL FLUIDS ; CHILE-ARGENTINA ; SPRING WATERS ; NOBLE-GASES ; HELIUM ; ORIGIN ; RESERVOIR ; NITROGEN
资助项目ANID-FONDAP project[15200001] ; ANID-FONDECYT Iniciacion grant[11130351] ; ANID-FONDECYT Regular grant[1201219] ; ANID-FONDEQUIP project[EQM120098]
WOS研究方向Geology
语种英语
WOS记录号WOS:000646275100008
出版者ELSEVIER
资助机构ANID-FONDAP project ; ANID-FONDAP project ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Regular grant ; ANID-FONDECYT Regular grant ; ANID-FONDEQUIP project ; ANID-FONDEQUIP project ; ANID-FONDAP project ; ANID-FONDAP project ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Regular grant ; ANID-FONDECYT Regular grant ; ANID-FONDEQUIP project ; ANID-FONDEQUIP project ; ANID-FONDAP project ; ANID-FONDAP project ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Regular grant ; ANID-FONDECYT Regular grant ; ANID-FONDEQUIP project ; ANID-FONDEQUIP project ; ANID-FONDAP project ; ANID-FONDAP project ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Iniciacion grant ; ANID-FONDECYT Regular grant ; ANID-FONDECYT Regular grant ; ANID-FONDEQUIP project ; ANID-FONDEQUIP project
源URL[http://ir.iggcas.ac.cn/handle/132A11/101207]  
专题地质与地球物理研究所_兰州油气中心
通讯作者Tardani, Daniele
作者单位1.Stratagem974, St Clotilde, Reunion, France
2.Univ Chile, Andean Geothermal Ctr Excellence CEGA, Santiago, Chile
3.Univ Austral Chile, Inst Ciencias Tierra, Valdivia, Chile
4.Consultoria & Invest Geol Ambiental Ltd, Huasco, Chile
5.Gansu Talent & Intelligence Ctr Remediat Closed &, Lanzhou 730000, Peoples R China
6.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
7.Univ Quebec Montreal, Dept Sci Terre & Atmosphere, Montreal, PQ, Canada
8.Univ Chile, Fac Ciencias Fis & Matemat, Dept Geol, Santiago 8370450, Chile
9.Univ Quebec Montreal, Geotop, Montreal, PQ, Canada
10.Univ La Reunion, Lab Geosci Reunion, F-97744 St Denis, France
推荐引用方式
GB/T 7714		 Tardani, Daniele,Roulleau, Emilie,Pinti, Daniele L.,et al. Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina[J]. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,2021,414:12.
APA Tardani, Daniele.,Roulleau, Emilie.,Pinti, Daniele L..,Perez-Flores, Pamela.,Daniele, Linda.,...&Richard, Luc.(2021).Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina.JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,414,12.
MLA Tardani, Daniele,et al."Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina".JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 414(2021):12.

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来源：地质与地球物理研究所

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