Decoding fjord water contribution and geochemical processes in the Aysen thermal springs (Southern Patagonia, Chile)

Negri, Angello; Daniele, Linda; Aravena, Diego; Muñoz, Mauricio; Delgado, Antonio; Morata, Diego

doi:10.1016/j.gexplo.2017.10.026

Cited by 23 publications

(10 citation statements)

References 59 publications

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“…3c y d). De la tendencia anterior, aquellas muestras obtenidas más cercanas al glaciar muestran valores similares (entre ~-6‰ a ~-8,4‰ de δ 18 O) a los reportados por Negri et al (2018), quienes analizaron aguas superficiales de algunos fiordos de Patagonia Norte, donde existe una mayor influencia de ríos que de glaciares de marea. A pesar de que en los valores isotópicos de los niveles más profundos no se observó una dependencia isotópica clara con los factores presentados (distancia al frente glaciar, temperatura y salinidad), se encontraron algunas variaciones y tendencias hacia el empobrecimiento isotópico que, para ser explicadas, sería necesario disponer de más datos en los mismos sitios y en otros como referencia.…”

Section: Resultados Y Discusiónunclassified

Primeras mediciones de isótopos estables de agua y su comportamiento en fiordos de los Campos de Hielo Patagónico Sur, Chile

Rodrigo

López

Cifuentes

et al. 2022

Rev. biol. mar. oceanogr.

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Stable isotope measurements of seawater from fjords in the Southern Patagonian Icefields area are presented for the first time. Stable water isotope variability was associated with physiographic and oceanographic factors. Isotope depletion and lower salinity were observed at lower depths, which is consistent with shallow estuarine waters. At greater depths, the characteristics of the modified Subantarctic water mass are inferred, and the glacier proximity and temperature do not show a clear relationship with the isotopic contents. These results could be a robust basis for a possible new proxy associated with changes in water masses, freshwater mixing, and paleoclimatic studies.

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Section: Resultados Y Discusiónunclassified

Primeras mediciones de isótopos estables de agua y su comportamiento en fiordos de los Campos de Hielo Patagónico Sur, Chile

Rodrigo

López

Cifuentes

et al. 2022

Rev. biol. mar. oceanogr.

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“…The volcanic and geothermal features in the area of the Eastern cluster are the minor eruptive centers of the Puyuhuapi Volcanic Group, as well as two hot springs and one shallow well (which have surface water temperatures of 61°C, 50°C, and 86°C, respectively; Negri et al, 2018). The mean distance between any given earthquake of the Eastern cluster and a minor eruptive center is 4.4 km.…”

Section: Resultsmentioning

confidence: 99%

Seismicity in a Transpressional Volcanic Arc: The Liquiñe‐Ofqui Fault System in the Puyuhuapi Area, Southern Andes, Chile (44°S)

et al. 2020

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Understanding the relationship between crustal faults and volcanic activity in transpressional environments is a main goal in geosciences and could help to understand geothermal resources and evaluate geological hazards. In the Andean Southern Volcanic Zone (SVZ), Chile, recorded seismicity is scarce, and few studies have evaluated the relationship between volcanic activity and crustal faults from seismic observations. Thus, in this study, we deployed a seismic network for almost 1 year to understand the brittle deformation of the upper crust within the Puyuhuapi area, located at~44°S in the SVZ. We analyzed the location and kinematics of seismicity together with previously published field structural geological data. Considering these results, we developed an integrative tectonic model for the area and discussed which faults facilitate magma transport through the crust. Our results indicate the existence of two NNE-oriented seismogenic dextral to dextral-reverse regional faults that generate a duplex in a continental-scale fault setting. Inside the duplex, we observed normal to strike-slip normal focal mechanisms which recurrently have NE trending nodal planes. At a regional scale, a strike-slip tectonic environment has a N60°E/18°shortening direction and a N151°E/03°extension direction. We conclude that stratovolcanoes are located inside the duplex in a local transtensional environment where NE oriented normal faulting may occur. These faults facilitate magma transport since they represent the preferential orientation for dilatational fractures. Conversely, in local transpressional environments such as the Puyuhuapi fault (NNE oriented dextral to dextral-reverse kinematics), only minor eruptive centers of small volume are emplaced, suggesting a less productive magma transportation process.

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“…The ratio of Na + and K + in thermal fluids reflects temperature-dependent ion exchange between geothermal groundwater and alkali feldspars (K + -feldspar, Na + -feldspar) 39 , and this geothermometer has been employed to characterize geothermal groundwaters in southern Chile 12,40 . If we assume that this method is also applicable in marine sediments that are influenced by geothermal groundwater, then pore water Na + /K + can be used to estimate the reservoir temperature of geothermal groundwaters influencing J1003.…”

Section: Constraints On the Geothermal Groundwater Reservoir And Fluid Migrationmentioning

confidence: 99%

“…Rainfall exceeding 7,500 mm yr -1 in southern Chile 10 promotes substantial recharge to kilometers depth through faulting in the bedrock. As a result, geothermal groundwaters in southern Chile can contain up to 50 percent meteoric fluid 11 and attain a chemical overprint, with dilute elemental concentrations (e.g., Clnear zero) and 18 O/ 16 O and 2 H/ 1 H isotope ratios (d 18 O and dD, respectively) that fall along the regional meteoric water line (MWL) 12,13 . Widespread offshore freshening of pore waters on the Chilean Margin, as indicated by 20-200 mM reductions in Clcompared to seawater, have been attributed to methane hydrate dissociation or mineral dehydration 14,15 .…”

Section: Introductionmentioning

confidence: 99%

“…The LOFZ and similar fault systems elsewhere act as a conduit for groundwater migration 9,23 . Fjord waters landward of J1003 in the Aysén region of Patagonia have geochemical signatures indicative of partial mixing with meteoric and geothermal sources, reflecting the transport of meteorically altered geothermal groundwater through the LOFZ to surface locations 12 . Using elemental and isotopic fingerprinting in high-resolution sediment pore water samples from J1003, we reveal that the meteorically altered geothermal waters that supply thermal springs at surface locations in Patagonia have also infiltrated marine sediments on the Chilean Margin, accounting for a large degree of the observed pore water freshening.…”

Section: Introductionmentioning

confidence: 99%

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Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin

Clementi¹,

Rosenthal²,

Bova³

et al. 2022

Preprint

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Submarine groundwater discharge is increasingly recognized as an important component of the oceanic geochemical budget, but knowledge of the distribution of this phenomenon is limited. To date, reports of meteoric inputs to marine sediments are typically limited to shallow shelf and coastal environments, whereas contributions of freshwater along deeper sections of tectonically active margins like the Chilean Margin have generally been attributed to silicate diagenesis, mineral dehydration, or methane hydrate dissociation. Here we report that substantial pore water freshening on the south Chilean Margin reflects deep and focused contributions of meteorically modified geothermal groundwater, which has infiltrated marine sediments through regional fault systems. Geochemical fingerprinting of pore water data from Site J1003, recovered during D/V JOIDES Resolution Expedition 379T, highlights mixing between this fresh groundwater endmember and seawater, and provides the first constraints on the depth of geothermal groundwater reservoirs in the Aysén region of Patagonia. Collectively, our results identify an unappreciated locus of deep submarine groundwater and geothermal discharge along active margins, with potential implications for coastal biogeochemical processes and tectonic instability.

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Decoding fjord water contribution and geochemical processes in the Aysen thermal springs (Southern Patagonia, Chile)

Cited by 23 publications

References 59 publications

Primeras mediciones de isótopos estables de agua y su comportamiento en fiordos de los Campos de Hielo Patagónico Sur, Chile

Primeras mediciones de isótopos estables de agua y su comportamiento en fiordos de los Campos de Hielo Patagónico Sur, Chile

Seismicity in a Transpressional Volcanic Arc: The Liquiñe‐Ofqui Fault System in the Puyuhuapi Area, Southern Andes, Chile (44°S)

Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin

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