Geochemical Analysis as a Complementary Tool to Estimate the Uplift of Sediments Caused by Shallow Gas Hydrates in Mounds at the Seafloor of Joetsu Basin, Eastern Margin of the Japan Sea
Joint Authors
Matsumoto, Ryo
Akiba, Fumio
Freire, Antonio Fernando Menezes
Source
Journal of Geological Research
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-10-02
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Earth Science , Water and Environment
Abstract EN
The Holocene sediments of the eastern margin of the Japan Sea are characterized by high total organic carbon (TOC) and total nitrogen (TN) contents, low TOC/TN and TS/TOC values with enriched δ13Corg signatures, as a result of high marine productivity during present oxic highstand.
On the other hand, the LGM sediments are characterized by low TOC and TN contents, high TOC/TN and TS/TOC values with depleted δ13Corg signatures, characteristic of C3-derived terrestrial organic matter input during that anoxic lowstand.
However, at the top of mounds at the seafloor, where gas hydrate and authigenic carbonate nodules occur, the host sediments have a mixture of both Holocene and LGM geochemical signatures.
Both gas hydrate and authigenic carbonate, formed by the anaerobic oxidation of methane, increased the sedimentary volume and caused an uplift of older sediments, inducing mound formation.
The thickness of the Holocene sediments over mounds is very small or absent exposing the last glacial maximum (LGM) sediments to the seafloor.
The uplift of the LGM sediments within mounds is estimated to be >2 m.
We conducted geochemical analysis to detect such sediment movement, using samples collected by shallow cores in the Joetsu Basin, eastern margin of the Japan Sea.
American Psychological Association (APA)
Freire, Antonio Fernando Menezes& Matsumoto, Ryo& Akiba, Fumio. 2012. Geochemical Analysis as a Complementary Tool to Estimate the Uplift of Sediments Caused by Shallow Gas Hydrates in Mounds at the Seafloor of Joetsu Basin, Eastern Margin of the Japan Sea. Journal of Geological Research،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-502347
Modern Language Association (MLA)
Freire, Antonio Fernando Menezes…[et al.]. Geochemical Analysis as a Complementary Tool to Estimate the Uplift of Sediments Caused by Shallow Gas Hydrates in Mounds at the Seafloor of Joetsu Basin, Eastern Margin of the Japan Sea. Journal of Geological Research No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-502347
American Medical Association (AMA)
Freire, Antonio Fernando Menezes& Matsumoto, Ryo& Akiba, Fumio. Geochemical Analysis as a Complementary Tool to Estimate the Uplift of Sediments Caused by Shallow Gas Hydrates in Mounds at the Seafloor of Joetsu Basin, Eastern Margin of the Japan Sea. Journal of Geological Research. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-502347
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-502347