| タイトル |
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en
Late Pleistocene changes in terrestrial biomarkers in sediments from the central Arctic Ocean
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| 作成者 |
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| アクセス権 |
open access |
| 主題 |
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Other
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Arctic
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Other
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biomarker
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Other
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glacial
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Other
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IODP
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Other
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ice rafted debris
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Other
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paleoenvironment
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NDC
450
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| 内容注記 |
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Abstract
en
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.
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| 出版者 |
en
Pergamon
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| 日付 |
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| 言語 |
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| 資源タイプ |
journal article |
| 出版タイプ |
AM |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/33895
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| 関連 |
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URI
http://www.sciencedirect.com/science/journal/01466380
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isVersionOf
DOI
https://doi.org/10.1016/j.orggeochem.2008.04.009
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| 収録誌情報 |
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en
Organic Geochemistry
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巻39
号6
開始ページ754
終了ページ763
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| ファイル |
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| コンテンツ更新日時 |
2023-07-26 |
