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Late Pleistocene changes in terrestrial biomarkers in sediments from the central Arctic Ocean

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/33895

Title: Late Pleistocene changes in terrestrial biomarkers in sediments from the central Arctic Ocean
Authors: Yamamoto, Masanobu Browse this author →KAKEN DB
Okino, Tatsufumi Browse this author →KAKEN DB
Sugisaki, Saiko Browse this author
Sakamoto, Tatsuhiko Browse this author
Keywords: Arctic
biomarker
glacial
IODP
ice rafted debris
paleoenvironment
Issue Date: Jun-2008
Publisher: Pergamon
Journal Title: Organic Geochemistry
Volume: 39
Issue: 6
Start Page: 754
End Page: 763
Publisher DOI: 10.1016/j.orggeochem.2008.04.009
Abstract: Biomarkers in Late Pleistocene sediments collected from the Integrated Ocean Drilling Program (IODP)-Arctic Coring Expedition (ACEX) Hole M0004C (central Arctic Ocean) were investigated. The major biomarkers are long-chain n-alkanes, n-fatty acids and n-alkan-1-ols, indicating fresh organic matter (OM) derived predominantly from higher plants. The dominance of terrestrial biomarkers is attributed to severe OM degradation caused by slow sedimentation in oxygen-rich benthic water and/or low primary production due to permanent sea-ice coverage. Hopanes, representing thermally altered OM, tend to be abundant in samples with abundant ice rafted debris (IRD). An OM-rich dark grey layer deposited during marine isotope stage (MIS) 6 contains a significant amount of branched glycerol dialkyl glycerol tetraethers (branched GDGTs), suggesting ice erosion of organic-rich continental soil followed by transportation to the central Arctic by drifting ice. The labile–refractory index (i.e., the abundance ratio of long-chain n-alkan-1-ols to the sum of long-chain n-alkanes and long-chain n-alkan-1-ols) decreases above the dark grey layer, indicating that the OM became more refractory. This change suggests that coverage of the source region by OM-rich soil decreased because of extensive glacial erosion during MIS-6.
Relation: http://www.sciencedirect.com/science/journal/01466380
Type: article (author version)
URI: http://hdl.handle.net/2115/33895
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 正伸

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