期刊
MARINE AND PETROLEUM GEOLOGY
卷 142, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2022.105727
关键词
Authigenic pyrite; Authigenic gypsum; Methane seepage; South Atlantic ocean; Magnetic susceptibility; Sulphur isotopes; Trace elements; Sulphate-methane transition zone
资金
- Fundacao de Amparo a~Pesquisa do Estado de Sao Paulo (FAPESP) [2016/24946-9]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- FAPESP [2017/04821-0, 2017/50085-]
This article reports the association of authigenic pyrite and gypsum in deep-sea sediments from the Santos Basin, South Atlantic, indicating biogeochemical reactions associated with methane seepage environments in marine environments. The study provides new evidence of past methane activity in this area.
An association of authigenic pyrite and gypsum has been found in deep-sea sediments from a core retrieved on the continental slope of the Santos Basin, South Atlantic. Pyrite occur mainly as tubular concretions formed by aggregates of framboids while gypsum show a rosette and acicular microcrystals habit. The concomitant presence of these minerals indicates the occurrence of biogeochemical reactions in marine environments that can be associated with methane seepage environments. Sulphur isotopic composition of authigenic minerals, magnetic susceptibility, and redox sensitive trace elements concentrations in bulk sediments are also used to characterize redox conditions and delimit a sulphate-methane transition zone (SMTZ) in this site. In this region, a pockmark field with methane release activity has already been recognized in sediments deposited during the Last Glacial Maximum. The conditions for the formation of these minerals, as well as their crystal habits, indicate the effect of biogeochemical processes consistent with methane seep environments. Therefore, our data provides new evidence about the occurrence of a past methane activity in this area.
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