DOI: 10.5194/cp-13-511-2017
Scopus记录号: 2-s2.0-85019846664
论文题名: Sedimentary record from the Canada Basin, Arctic Ocean: Implications for late to middle Pleistocene glacial history
作者: Dong L. ; Liu Y. ; Shi X. ; Polyak L. ; Huang Y. ; Fang X. ; Liu J. ; Zou J. ; Wang K. ; Sun F. ; Wang X.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2017
卷: 13, 期: 5 起始页码: 511
结束页码: 531
语种: 英语
英文摘要: Sediment core ARC4-BN05 collected from the Canada Basin, Arctic Ocean, covers the late to middle Quaternary (Marine Isotope Stage - MIS - 1-15, ca. 0.5-0.6 Ma) as estimated by correlation to earlier proposed Arctic Ocean stratigraphies and AMS14C dating of the youngest sediments. Detailed examination of clay and bulk mineralogy along with grain size, content of Ca and Mn, and planktic foraminiferal numbers in core ARC4-BN05 provides important new information about sedimentary environments and provenance. We use increased contents of coarse debris as an indicator of glacier collapse events at the margins of the western Arctic Ocean, and identify the provenance of these events from mineralogical composition. Notably, peaks of dolomite debris, including large dropstones, track the Laurentide Ice Sheet (LIS) discharge events to the Arctic Ocean. Major LIS inputs occurred during the stratigraphic intervals estimated as MIS 3, intra-MIS 5 and 7 events, MIS 8, and MIS 10. Inputs from the East Siberian Ice Sheet (ESIS) are inferred from peaks of smectite, kaolinite, and chlorite associated with coarse sediment. Major ESIS sedimentary events occurred in the intervals estimated as MIS 4, MIS 6 and MIS 12. Differences in LIS vs. ESIS inputs can be explained by ice-sheet configurations at different sea levels, sediment delivery mechanisms (iceberg rafting, suspension plumes, and debris flows), and surface circulation. A long-term change in the pattern of sediment inputs, with an apparent step change near the estimated MIS 7-8 boundary (ca. 0.25 Ma), presumably indicates an overall glacial expansion at the western Arctic margins, especially in North America. © Author(s) 2017. 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48920
Appears in Collections: 气候变化与战略
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Recommended Citation:
Dong L.,Liu Y.,Shi X.,et al. Sedimentary record from the Canada Basin, Arctic Ocean: Implications for late to middle Pleistocene glacial history[J]. Climate of the Past,2017-01-01,13(5)