Consulta: creatorFacets:"Ikehara, Ken"
Registros recuperados: 3
Data/hora: 05/06/2024 19:02:31

Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective
Provedor de dados: 5
Autores: Shibahara, Akihiko; Ohkushi, Ken'Ichi; Kennett, James P.; Ikehara, Ken.
A strong oxygen minimum zone (OMZ) currently exists at upper intermediate water depths on the northern Japanese margin, NW Pacific. The OMZ results largely from a combination of high surface water productivity and poor ventilation of upper intermediate waters. We investigated late Quaternary history ( last 34 kyr) of ocean floor oxygenation and the OMZ using quantitative changes in benthic foraminiferal assemblages in three sediment cores taken from the continental slope off Shimokita Peninsula and Tokachi, northern Japan, at water depths between 975 and 1363 m. These cores are well located within the present-day OMZ, a region of high surface water productivity, and in close proximity to the source region of North Pacific Intermediate Water. Late...
Tipo: Text
Palavras-chave: Benthic foraminifera; Paleoceanography; Oyashio; Biological production; Last glacial; Deglacial; Holocene.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00236/34733/33182.pdf

High-resolution and high-precision correlation of dark and light layers in the Quaternary hemipelagic sediments of the Japan Sea recovered during IODP Expedition 346
Provedor de dados: 5
Autores: Tada, Ryuji; Irino, Tomohisa; Ikehara, Ken; Karasuda, Akinori; Sugisaki, Saiko; Xuan, Chuang; Sagawa, Takuya; Itaki, Takuya; Kubota, Yoshimi; Lu, Song; Seki, Arisa; Murray, Richard W.; Alvarez-zarikian, Carlos; Anderson, William T., Jr.; Bassetti, Maria-angela; Brace, Bobbi J.; Clemens, Steven C.; Da Costa Gurgel, Marcio H.; Dickens, Gerald R.; Dunlea, Ann G.; Gallagher, Stephen J; Giosan, Liviu; Henderson, Andrew C. G.; Holbourn, Ann E.; Kinsley, Christopher W.; Lee, Gwang Soo; Lee, Kyung Eun; Lofi, Johanna; Lopes, Christina I. C. D.; Saavedra-pellitero, Mariem; Peterson, Larry C.; Singh, Raj K.; Toucanne, Samuel; Wan, Shiming; Zheng, Hongbo; Ziegler, Martin.
The Quaternary hemipelagic sediments of the Japan Sea are characterized by centimeter-to decimeter-scale alternation of dark and light clay to silty clay, which are bio-siliceous and/or bio-calcareous to a various degree. Each of the dark and light layers are considered as deposited synchronously throughout the deeper (&gt; 500 m) part of the sea. However, attempts for correlation and age estimation of individual layers are limited to the upper few tens of meters. In addition, the exact timing of the depositional onset of these dark and light layers and its synchronicity throughout the deeper part of the sea have not been explored previously, although the onset timing was roughly estimated as similar to 1.5 Ma based on the result of Ocean Drilling Program...
Tipo: Text
Palavras-chave: Quaternary sediments; Japan Sea; Inter-site correlation; High-resolution age model; IODP; Expedition 346; U1424; U1425; U1426; U1430.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00437/54817/56292.pdf

A 6600 year earthquake history in the region of the 2004 Sumatra-Andaman subduction zone earthquake
Provedor de dados: 5
Autores: Patton, Jason R.; Goldfinger, Chris; Morey, Ann E.; Ikehara, Ken; Romsos, Chris; Stoner, Joseph; Djadjadihardja, Yusuf; Udrekh,; Sri Ardhyastuti,; Gaffar, Eddy Zulkarnaen; Vizcaino, Alexis.
In order to investigate the possibility of a long-term paleoseismic history from offshore sedimentary records in Sumatra, we collected 144 deep-sea sedi-ment cores in the trench and in lower slope piggyback basins of the Sumatra accretionary prism. We used multibeam bathymetry and seismic reflection data to develop an understanding of catchment basins, turbidity current pathways, and depositional styles, as well as to precisely locate our gravity cores, piston cores, Kasten cores, and multicores. We use detailed physical property data, including computed tomographic X-ray, gamma density, magnetic susceptibility, grain-size analysis, faunal analysis, and smear slides, to evaluate the turbidite stratigraphy and sedimentology at each site. We use radiocarbon...
Tipo: Text
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00351/46229/46162.pdf