气候变化领域集成服务门户(CCPortal): Sedimentology and history of sediment sources to the NW Labrador Sea during the past glacial cycle

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DOI	10.1016/j.quascirev.2019.105880
	Sedimentology and history of sediment sources to the NW Labrador Sea during the past glacial cycle
	Rashid H.; Piper D.J.; Drapeau J.; Marin C.; Smith M.E.
发表日期	2019
ISSN	0277-3791
卷号	221
英文摘要	The paleoceanography and sediment dynamics of the northernmost Labrador Sea provides critical records of glacial history, glacially-dominated sedimentation, and paleocirculation. A reference core at 938 m on the SE Baffin Slope was investigated with new oxygen isotope stratigraphy, X-ray fluorescence geochemistry, and 18 14C-AMS dates and correlated to 14 regional deep-water cores. The reference core provides a paleoceanographic and sediment source record over the last 40 ka, overlying a 3-m-thick blocky mass-transport deposit over MIS 5 autochthonous sediment. Detrital carbonate-rich sediment layers H0-H4, based on bulk geochemistry, were derived principally from Hudson Strait. Shortly after H2 and H3, the shelf-crossing Cumberland Sound ice stream supplied dark brown ice-proximal stratified sediments. Minor supply of carbonate-rich sediment from Baffin Bay allows chronologic integration of the Baffin Bay and Labrador Sea detrital carbonate records and implies an open seaway through Davis Strait. The counterparts of H3, H4, and (?)H5 events in the deep Labrador basin are 4–10 m thick units of thin-bedded carbonate-rich mud turbidites from glacigenic debris flows on the Hudson Strait slope. The behavior of the Hudson Strait ice stream changed through the last glacial cycle. In H1 and H2, the ice stream retreated back across the shelf but did not deglaciate Hudson Bay; in H3–H5 it remained at the shelf break long enough to supply thick turbidites, and subsequent retreat after H4 and H5 deglaciated Hudson Bay. The maximum extent of ice streams in Hudson Strait, Cumberland Sound, and Lancaster Sound was not synchronous. © 2019 Elsevier Ltd
语种	英语
scopus关键词	Carbonation; Geochemistry; Glacial geology; Sediments; Stratigraphy; Detrital carbonate; Glacigenic debris flows; Last glacial cycles; Mass transport deposit; Oxygen isotope stratigraphy; Paleoceanography; Paleocirculation; X ray fluorescence; Ice; autochthony; core analysis; dissolution; glacial-interglacial cycle; ice stream; mud; oxygen isotope; paleoceanography; sediment transport; sedimentology; sequence stratigraphy; turbidite; Arctic; Arctic Ocean; Atlantic Ocean; Baffin Bay [Arctic Ocean]; Baffin Island; Canada; Cumberland Sound; Davis Strait; Hudson Bay; Hudson Strait; Labrador Sea; Lancaster Sound; Nunavut
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151773
作者单位	College of Marine Sciences, Shanghai Ocean University, Shanghai, China; Natural Resources Canada, Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, 1 Challenger Drive, Dartmouth, NS, Canada; Earth and Planetary Sciences, McGill University, Montreal, Canada; College of Marine Sciences, University of South Florida, St. Petersburg, United States; School of Earth Sciences, The Ohio State University, Columbus, United States
推荐引用方式 GB/T 7714	Rashid H.,Piper D.J.,Drapeau J.,et al. Sedimentology and history of sediment sources to the NW Labrador Sea during the past glacial cycle[J],2019,221.
APA	Rashid H.,Piper D.J.,Drapeau J.,Marin C.,&Smith M.E..(2019).Sedimentology and history of sediment sources to the NW Labrador Sea during the past glacial cycle.Quaternary Science Reviews,221.
MLA	Rashid H.,et al."Sedimentology and history of sediment sources to the NW Labrador Sea during the past glacial cycle".Quaternary Science Reviews 221(2019).