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Gas Hydrate Systems...
Gas Hydrate Systems on the Brazilian Continental Margin
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- Ketzer, João Marcelo (author)
- Linnéuniversitetet,Institutionen för biologi och miljö (BOM),Vatten
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- Viana, Adriano (author)
- Petrobras Petróleo Brasileiro SA, Brazil
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- Miller, Dennis (author)
- Petrobras Petróleo Brasileiro SA, Brazil
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- Augustin, Adolpho (author)
- Pontifical Catholic University of Rio Grande do Sul, Brazil
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- Rodrigues, Frederico (author)
- Pontifical Catholic University of Rio Grande do Sul, Brazil
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- Praeg, Daniel (author)
- Pontifical Catholic University of Rio Grande do Sul, Brazil;Géoazur, France
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- Cupertino, Jose (author)
- Pontifical Catholic University of Rio Grande do Sul, Brazil
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- Freire, Fernando (author)
- Fluminense Federal University, Brazil
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- Kowsmann, Renato (author)
- Petrobras Petróleo Brasileiro SA, Brazil
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- Dickens, Gerald R. (author)
- Trinity College, Ireland
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- Malinverno, Alberto (author)
- Lamont-Doherty Earth Observatory of Columbia University, USA
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(creator_code:org_t)
- 2022-01-01
- 2022
- English.
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In: World Atlas of Submarine Gas Hydrates in Continental Margins. - Cham : Springer. - 9783030811853 - 9783030811860 ; , s. 343-352
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The existence of gas hydrate systems along Brazil’s vast continental margin has been known since the 1980s, based on observations of bottom simulating reflectors (BSRs) in two large shelf-slope depocenters: (1) the Amazon deep-sea fan in the Foz do Amazonas Basin and (2) Rio Grande Cone in Pelotas Basin. These depocenters are both undergoing gravitational collapse above deep detachment surfaces, resulting in upslope extensional and downslope compressional domains. The BSR is discontinuous across the Amazon deep-sea fan, mainly observed at water depths of 600–2800 m and at anticlines within an upper slope thrust-fold belt related to the compressional domain of the fan. Conversely, a fairly continuous BSR extends across Rio Grande Cone at water depths of 520–3500 m, within both extensional and compressional domains. Interestingly, the well-defined BSR that spans Rio Grande Cone rises to meet the seafloor at water depths of 515–520 m, forming an unusual ‘BSR outcrop’. This phenomenon has been observed previously in only a few locations worldwide. Gas hydrates have been recovered within piston cores taken from seafloor seeps in both depocenters, and analyses reveal that gas is dominated by methane of microbial origin.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Natural Science
- Naturvetenskap
Publication and Content Type
- ref (subject category)
- kap (subject category)
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- By the author/editor
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Ketzer, João Mar ...
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Viana, Adriano
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Miller, Dennis
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Augustin, Adolph ...
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Rodrigues, Frede ...
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Praeg, Daniel
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Cupertino, Jose
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Freire, Fernando
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Kowsmann, Renato
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Dickens, Gerald ...
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Malinverno, Albe ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
- Articles in the publication
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World Atlas of S ...
- By the university
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Linnaeus University