Late Quaternary paleoceanography of Vestnesa Ridge, Fram Strait; ostracode species as a potential indicator of cold seep activity

Past intensity of methane release from deep-ocean methane hydrates continues to be challenging to reconstruct reliably. Here, we used fossil ostracode fauna paired with foraminiferal δ13C values in a marine sediment core from Vestnesa Ridge, western Svalbard margin, to reconstruct methane seepage ac...

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Bibliographic Details
Published in:Geology (Boulder) 2023-08, Vol.51 (8), p.758-762
Main Authors: Chu, Rachel Wai Ching, Yasuhara, Moriaki, Riise, Karoline Myrvang, Asahi, Hirofumi, Huang, Huai-Hsuan May, Cotton, Laura J, Hong Yuanyuan, Hong Yuanyuan, Rasmussen, Tine L
Format: Article
Language:English
Subjects:
aliphatic hydrocarbons
alkanes
Arctic Ocean
Arctic region
Arthropoda
Benthos
Carbon 13
Cenozoic
Climate change
cold seeps
continental margin
Crustacea
Cytheruridae
Foraminifera
Fossils
Fram Strait
Gas seepage
Geology
Global climate
Hydrates
hydrocarbons
Isotopes
Mandibulata
Marine sediment cores
Marine sediments
Methane
Methane hydrates
microfossils
organic compounds
Ostracoda
Palaeoceanography
Paleoceanography
Podocopida
Quaternary
Quaternary geology
Rosaliella
Rosaliella svalbardensis
sediments
Seepage
Svalbard
upper Quaternary
Vestnesa Ridge
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Summary:Past intensity of methane release from deep-ocean methane hydrates continues to be challenging to reconstruct reliably. Here, we used fossil ostracode fauna paired with foraminiferal δ13C values in a marine sediment core from Vestnesa Ridge, western Svalbard margin, to reconstruct methane seepage activity during the late Quaternary and to examine faunal response to deglacial climatic changes. Benthic foraminiferal δ13C values indicate methane seepage activity was relatively strong during marine isotope stage 2, corresponding to a high percentage of the ostracode Rosaliella svalbardensis in the assemblage. In contrast, this species was absent under conditions of no or very strong seepage of methane. Faunal changes in other taxa were more related to global climate changes regardless of the seepage activity. This result indicates that Rosaliella svalbardensis is a potential new useful proxy for past methane release.
ISSN:0091-7613
1943-2682
1943-2682
DOI:10.1130/G51237.1