Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating
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 fr...
Published in: | Paleoceanography |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2020
|
Subjects: | |
Online Access: | http://eprints.gla.ac.uk/211955/ http://eprints.gla.ac.uk/211955/1/211955.pdf |
id |
ftuglasgow:oai:eprints.gla.ac.uk:211955 |
---|---|
record_format |
openpolar |
spelling |
ftuglasgow:oai:eprints.gla.ac.uk:211955 2023-05-15T13:33:26+02:00 Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating Rudolph, Elizabeth M. Hedding, David W. Fabel, Derek Hodgson, Dominic A. Gheorghiu, Delia M. Shanks, Richard Nel, Werner 2020-03-01 text http://eprints.gla.ac.uk/211955/ http://eprints.gla.ac.uk/211955/1/211955.pdf en eng Elsevier http://eprints.gla.ac.uk/211955/1/211955.pdf Rudolph, E. M., Hedding, D. W., Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> , Hodgson, D. A., Gheorghiu, D. M. <http://eprints.gla.ac.uk/view/author/4244.html> , Shanks, R. <http://eprints.gla.ac.uk/view/author/15948.html> and Nel, W. (2020) Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 231, 106208. (doi:10.1016/j.quascirev.2020.106208 <http://dx.doi.org/10.1016/j.quascirev.2020.106208>) cc_by_nc_nd_4 CC-BY-NC-ND Articles PeerReviewed 2020 ftuglasgow https://doi.org/10.1016/j.quascirev.2020.106208 2021-02-18T23:08:52Z 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. Article in Journal/Newspaper Antarc* Antarctic Marion Island University of Glasgow: Enlighten - Publications Antarctic Campbell Islands ENVELOPE(-103.668,-103.668,56.984,56.984) Indian Kerguelen New Zealand Patagonia The Antarctic Paleoceanography 29 4 328 343 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Rudolph, Elizabeth M. Hedding, David W. Fabel, Derek Hodgson, Dominic A. Gheorghiu, Delia M. Shanks, Richard Nel, Werner |
spellingShingle |
Rudolph, Elizabeth M. Hedding, David W. Fabel, Derek Hodgson, Dominic A. Gheorghiu, Delia M. Shanks, Richard Nel, Werner Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating |
author_facet |
Rudolph, Elizabeth M. Hedding, David W. Fabel, Derek Hodgson, Dominic A. Gheorghiu, Delia M. Shanks, Richard Nel, Werner |
author_sort |
Rudolph, Elizabeth M. |
title |
Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating |
title_short |
Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating |
title_full |
Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating |
title_fullStr |
Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating |
title_full_unstemmed |
Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating |
title_sort |
early glacial maximum and deglaciation at sub-antarctic marion island from cosmogenic ³⁶cl exposure dating |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://eprints.gla.ac.uk/211955/ http://eprints.gla.ac.uk/211955/1/211955.pdf |
long_lat |
ENVELOPE(-103.668,-103.668,56.984,56.984) |
geographic |
Antarctic Campbell Islands Indian Kerguelen New Zealand Patagonia The Antarctic |
geographic_facet |
Antarctic Campbell Islands Indian Kerguelen New Zealand Patagonia The Antarctic |
genre |
Antarc* Antarctic Marion Island |
genre_facet |
Antarc* Antarctic Marion Island |
op_relation |
http://eprints.gla.ac.uk/211955/1/211955.pdf Rudolph, E. M., Hedding, D. W., Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> , Hodgson, D. A., Gheorghiu, D. M. <http://eprints.gla.ac.uk/view/author/4244.html> , Shanks, R. <http://eprints.gla.ac.uk/view/author/15948.html> and Nel, W. (2020) Early glacial maximum and deglaciation at sub-Antarctic Marion Island from cosmogenic ³⁶Cl exposure dating. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 231, 106208. (doi:10.1016/j.quascirev.2020.106208 <http://dx.doi.org/10.1016/j.quascirev.2020.106208>) |
op_rights |
cc_by_nc_nd_4 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106208 |
container_title |
Paleoceanography |
container_volume |
29 |
container_issue |
4 |
container_start_page |
328 |
op_container_end_page |
343 |
_version_ |
1766042302275387392 |