Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin
-
Published:2022-09-21
Issue:1
Volume:3
Page:
-
ISSN:2662-4435
-
Container-title:Communications Earth & Environment
-
language:en
-
Short-container-title:Commun Earth Environ
Author:
Clementi Vincent J.ORCID, Rosenthal YairORCID, Bova Samantha C.ORCID, Thomas Elizabeth K.ORCID, Wright James D., Mortlock Richard A., Cowling Owen C., Godfrey Linda V., Childress Laurel B.ORCID, Aiello Ivano W., Avila Alejandro, Biggs William, Charles Christopher D., Cheung Anson H., deLong Kimberly, Dove Isabel A., Du Xiaojing, Estes Emily R., Fuentes Ursula, García-Lasanta Cristina, Goldstein Steven L., Golub Anna, Hagemann Julia Rieke, Hatfield Robert G., Haynes Laura L., Hess Anya V., Irvali Nil, Kiro Yael, Monteagudo Minda M., Lambert Jonathan E., Li Chen, Longo William M., McGrath Sarah, Riechelson Hailey, Robinson Rebecca S., Sarao John, Sproson Adam D., Taylor Shawn, Yokoyama Yusuke, Yu Siyao M.,
Abstract
AbstractSubmarine 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 have generally been attributed to silicate diagenesis, mineral dehydration, or methane hydrate dissociation. Here, using geochemical fingerprinting of pore water data from Site J1003 recovered from the Chilean Margin during D/V JOIDES Resolution Expedition 379 T, we show that substantial offshore freshening reflects deep and focused contributions of meteorically modified geothermal groundwater, which is likely sourced from a reservoir ~2.8 km deep in the Aysén region of Patagonia and infiltrated marine sediments during or shortly after the last glacial period. Emplacement of fossil groundwaters reflects an apparently ubiquitous phenomenon in margin sediments globally, but our results now identify an unappreciated locus of deep submarine groundwater discharge along active margins with potential implications for coastal biogeochemical processes and tectonic instability.
Funder
National Research Council
Publisher
Springer Science and Business Media LLC
Subject
General Earth and Planetary Sciences,General Environmental Science
Reference66 articles.
1. Moore, W. S. The effect of submarine groundwater discharge on the ocean. Ann. Rev. Marine Sci. 2, 59–88 (2010). 2. Mayfield, K. K. et al. Groundwater discharge impacts marine isotope budgets of Li, Mg, Ca, Sr, and Ba. Nat. Commun. 12, 9 (2021). 3. Rahman, S., Tamborski, J. J., Charette, M. A. & Cochran, J. K. Dissolved silica in the subterranean estuary and the impact of submarine groundwater discharge on the global marine silica budget. Marine Chem. 208, 29–42 (2019). 4. Micallef, A. et al. Offshore freshened groundwater in continental margins. Rev. Geophys. 59 https://doi.org/10.1029/2020rg000706 (2021). 5. Post, V. E. A. et al. Offshore fresh groundwater reserves as a global phenomenon. Nature 504, 71–78 (2013).
|
|