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DOI	10.1016/j.quascirev.2020.106208
	Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic 36Cl exposure dating
	Rudolph E.M.; Hedding D.W.; Fabel D.; Hodgson D.A.; Gheorghiu D.M.; Shanks R.; Nel W.
发表日期	2020
ISSN	0277-3791
卷号	231
英文摘要	Southern Hemisphere glacial chronologies can provide valuable insights into interactions between glaciation and past climate changes, but are not well constrained on most sub-Antarctic islands. We present the first cosmogenic 36Cl exposure ages of deglaciated bedrock surfaces and moraine deposits from sub-Antarctic Marion Island in the southern Indian Ocean. Results show that the ice reached a local Last Glacial Maximum before 34 ka and retreated, with no re-advances, but possibly minor stand stills, until ∼17 ka. This early deglaciation left island surfaces below 850 m a.s.l. ice-free after ∼19 ka, and any subsequent advances during the Antarctic Cold Reversal or Holocene cooling periods would have been restricted to the interior. This glacial chronology is similar to that of some other sub-Antarctic Islands (e.g. the Kerguelen archipelago, Auckland and Campbell islands, and possibly South Georgia) and a number of other Southern Hemisphere glaciers (e.g. in Patagonia and New Zealand) and adds to evidence that suggest the Southern Hemisphere was in a glacial maxima earlier than the global LGM. We suggest a combination of declining temperatures, a northward migration of oceanic fronts and the Southern Hemisphere westerly winds (causing precipitation changes), as well as the physiography of Marion Island, created optimal conditions for glacier growth during Marine Isotope Stage (MIS) 3 instead of MIS 2. Our findings redefine the glacial history of Marion Island, and have implications for future investigations on post-glacial landscape development and ecological succession. © 2020
英文关键词	Chlorine-36; Cosmogenic isotopes; Geomorphology; Glacial; Glaciation; Last glacial maximum; Marion island; MIS 3; Pleistocene; Southern ocean; Sub-Antarctic
语种	英语
scopus关键词	Climate change; Geomorphology; Isotopes; Cosmogenic isotopes; Glacial; Glaciation; Last Glacial Maximum; Marion island; Pleistocene; Southern ocean; Sub-Antarctic; Glacial geology; bedrock; chronology; cooling; geomorphology; glacial history; glaciation; Holocene; Last Glacial Maximum; marine isotope stage; Postglacial; Southern Hemisphere; subantarctic region; westerly; Antarctica; Auckland [North Island]; French Southern Territories; Georgia; Indian Ocean; Indian Ocean (South); Kerguelen; Kerguelen Islands; Marion Island; Patagonia; Prince Edward Islands; South Georgia; Southern Ocean; United States
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/151568
作者单位	Department of Geography and Environmental Science, University of Fort Hare, 1 King Williamstown Road, Alice, 5700, South Africa; Department of Geography, University of South Africa, P O Box 392, Unisa, Florida 0003, South Africa; Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, G75 0QF, United Kingdom; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom
推荐引用方式 GB/T 7714	Rudolph E.M.,Hedding D.W.,Fabel D.,et al. Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic 36Cl exposure dating[J],2020,231.
APA	Rudolph E.M..,Hedding D.W..,Fabel D..,Hodgson D.A..,Gheorghiu D.M..,...&Nel W..(2020).Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic 36Cl exposure dating.Quaternary Science Reviews,231.
MLA	Rudolph E.M.,et al."Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic 36Cl exposure dating".Quaternary Science Reviews 231(2020).