气候变化领域集成服务门户(CCPortal): Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina

CCPortal

DOI	10.1016/j.jvolgeores.2021.107228
	Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina
	Tardani, Daniele; Roulleau, Emilie; Pinti, Daniele L.; Perez-Flores, Pamela; Daniele, Linda; Reich, Martin; Sanchez-Alfaro, Pablo; Morata, Diego; Richard, Luc
通讯作者	Tardani, D (通讯作者)，Univ Austral Chile, Inst Ciencias Tierra, Valdivia, Chile.
发表日期	2021
ISSN	0377-0273
EISSN	1872-6097
卷号	414
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.
关键词	ISOTOPIC COMPOSITION CARBON-DIOXIDE GEOTHERMAL FLUIDS CHILE-ARGENTINA SPRING WATERS NOBLE-GASES HELIUM ORIGIN RESERVOIR NITROGEN
英文关键词	Helium isotopes; Radiocarbon; Tritium; Strontium isotopes; Copahue volcano; Geothermal systems
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000646275100008
来源期刊	JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255004
作者单位	[Tardani, Daniele; Sanchez-Alfaro, Pablo] Univ Austral Chile, Inst Ciencias Tierra, Valdivia, Chile; [Tardani, Daniele; Daniele, Linda; Reich, Martin; Sanchez-Alfaro, Pablo; Morata, Diego] Univ Chile, Andean Geothermal Ctr Excellence CEGA, Santiago, Chile; [Roulleau, Emilie] Stratagem974, St Clotilde, Reunion, France; [Roulleau, Emilie] Univ La Reunion, Lab Geosci Reunion, F-97744 St Denis, France; [Pinti, Daniele L.; Richard, Luc] Univ Quebec Montreal, Geotop, Montreal, PQ, Canada; [Pinti, Daniele L.; Richard, Luc] Univ Quebec Montreal, Dept Sci Terre & Atmosphere, Montreal, PQ, Canada; [Pinti, Daniele L.] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China; [Pinti, Daniele L.] Gansu Talent & Intelligence Ctr Remediat Closed &, Lanzhou 730000, Peoples R China; [Perez-Flores, Pamela] Consultoria & Invest Geol Ambiental Ltd, Huasco, Chile; [Daniele, Linda; Reich, Martin; Morata, Diego] Univ Chile, Fac Ciencias Fis & Matemat, Dept Geol, Sa...
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]. 中国科学院西北生态环境资源研究院,2021,414.
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.
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).