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Gravity complexes a...
Gravity complexes as a focus of seafloor fluid seepage : the Rio Grande Cone, SE Brazil
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- Ketzer, João Marcelo (author)
- Linnéuniversitetet,Institutionen för biologi och miljö (BOM)
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- Praeg, D. (author)
- Independent researcher
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- Augustin, A. H. (author)
- Pontificia Universidade Catolica do Rio Grande do Sul, Brazil
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- Rodrigues, L. F. (author)
- Universidade Federal do Rio Grande, Brazil
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- Steiger, A. K. (author)
- Pontificia Universidade Catolica do Rio Grande do Sul, Brazil
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- Rahmati-Abkenar, Mahboubeh (author)
- Linnéuniversitetet,Institutionen för biologi och miljö (BOM)
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- Viana, A. R. (author)
- Petrobras Petroleo Brasileiro SA, Brazil
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- Miller, D. J. (author)
- Petrobras Petroleo Brasileiro SA, Brazil
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- Malinverno, A. (author)
- Lamont-Doherty Earth Observatory of Columbia University, USA
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- Dickens, G. R. (author)
- Trinity College Dublin, Ireland
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- Cupertino, J. A. (author)
- Pontificia Universidade Catolica do Rio Grande do Sul, Brazil
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(creator_code:org_t)
- 2023-03-21
- 2023
- English.
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In: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 13:1
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Seafloor methane emissions can affect Earth’s climate and ocean chemistry. Vast quantities of methane formed by microbial decomposition of organic matter are locked within gas hydrate and free gas on continental slopes, particularly in large areas with high sediment accumulations such as deep-sea fans. The release of methane in slope environments has frequently been associated with dissociation of gas hydrates near the edge of the gas hydrate stability zone on the upper slope, with discharges in greater water depths less understood. Here we show, using data from the Rio Grande Cone (western South Atlantic), that the intrinsic, gravity-induced downslope collapse of thick slope sediment accumulations creates structures that serve as pathways for gas migration, unlocking methane and causing seafloor emissions via giant gas flares in the water column. The observed emissions in the study region (up to 310 Mg year−1) are three times greater than estimates for the entire US North Atlantic margin and reveal the importance of collapsing sediment accumulations for ocean carbon cycling. Similar outgassing systems on the Amazon and Niger fans suggest that gravity tectonics on passive margins is a common yet overlooked mechanism driving massive seafloor methane emissions in sediment-laden continental slopes. © 2023, The Author(s).
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Natural Science
- Naturvetenskap
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Ketzer, João Mar ...
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Praeg, D.
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Augustin, A. H.
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Rodrigues, L. F.
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Steiger, A. K.
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Rahmati-Abkenar, ...
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show more...
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Viana, A. R.
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Miller, D. J.
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Malinverno, A.
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Dickens, G. R.
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Cupertino, J. A.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Climate Research
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geology
- Articles in the publication
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Scientific Repor ...
- By the university
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Linnaeus University