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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
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Late Pleistocene changes in terrestrial biomarkers in sediments from the central Arctic Ocean
| 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)
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Submitter: 山本 正伸
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