Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation
Oscillations in ice sheet extent during early and middle Miocene are intermittently preserved in the sedimentary record from the Antarctic continental shelf, with widespread erosion occurring during major ice sheet advances, and open marine deposition during times of ice sheet retreat. Data from sei...
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/88294 2023-05-15T13:43:46+02:00 Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation Pérez, LF De Santis, L McKay, RM Larter, RD Ash, J Bart, PJ Böhm, G Brancatelli, G Brown, I Colleoni, F Dodd, JP Geletti, R Harwood, DM Kuhn, G Laberg, JS Leckie, RM Levy, RH Marschalek, J Mateo, Z Naish, TR Sangiorgi, F Shevenell, A Sorlien, CC Van de Flierdt, T IODP Expedition 374 Scientists Natural Environment Research Council (NERC) 2021-02-23 http://hdl.handle.net/10044/1/88294 unknown Geological Society of America GSA Bulletin 0016-7606 http://hdl.handle.net/10044/1/88294 NE/R018219/1 This paper is embargoed until publication. 10000-01-01 0402 Geochemistry 0403 Geology 0404 Geophysics Geology Journal Article 2021 ftimperialcol 2021-05-13T22:39:45Z Oscillations in ice sheet extent during early and middle Miocene are intermittently preserved in the sedimentary record from the Antarctic continental shelf, with widespread erosion occurring during major ice sheet advances, and open marine deposition during times of ice sheet retreat. Data from seismic reflection surveys and drill sites from Deep Sea Drilling Project (DSDP) Leg 28 and International Ocean Discovery Program (IODP) Expedition 374 located across the present-day middle continental shelf of the central Ross Sea, indicate the presence of expanded early to middle Miocene sedimentary sections. These include the Miocene Climate Optimum (MCO ∼17-14. 6 Ma), and the Middle Miocene Climate Transition (MMCT ∼14.6-13.9 Ma). Here, we correlate drill core records, wireline logs and reflection seismic data to elucidate the depositional architecture of the continental shelf and reconstruct the evolution and variability of dynamic ice sheets in the Ross Sea during the Miocene. Drill-site data are used to constrain seismic isopach maps that document the evolution of different ice sheets and ice caps which influenced sedimentary processes in the Ross Sea through the early to middle Miocene. In the early Miocene, periods of localized advance of the ice margin are revealed by the formation of thick sediment wedges prograding into the basins. At this time, morainal bank complexes are distinguished along the basin margins suggesting sediment supply derived from marine-terminating glaciers. During the MCO, biosiliceous-bearing sediments are regionally mapped within the depocenters of the major sedimentary basin across the Ross Sea, indicative of widespread open marine deposition with reduced glacimarine influence. At the MMCT, a distinct erosive surface is interpreted as representing large-scale marine-based ice sheet advance over most of the Ross Sea paleo-continental shelf. The regional mapping of the seismic stratigraphic architecture and its correlation to drilling data indicate a regional transition through the Miocene from growth of ice caps and inland ice sheets with marine-terminating margins, to widespread marine-based ice sheets extending across the outer continental shelf in 58the Ross Sea. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ross Sea Imperial College London: Spiral Antarctic Ross Sea The Antarctic |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
0402 Geochemistry 0403 Geology 0404 Geophysics Geology |
spellingShingle |
0402 Geochemistry 0403 Geology 0404 Geophysics Geology Pérez, LF De Santis, L McKay, RM Larter, RD Ash, J Bart, PJ Böhm, G Brancatelli, G Brown, I Colleoni, F Dodd, JP Geletti, R Harwood, DM Kuhn, G Laberg, JS Leckie, RM Levy, RH Marschalek, J Mateo, Z Naish, TR Sangiorgi, F Shevenell, A Sorlien, CC Van de Flierdt, T IODP Expedition 374 Scientists Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation |
topic_facet |
0402 Geochemistry 0403 Geology 0404 Geophysics Geology |
description |
Oscillations in ice sheet extent during early and middle Miocene are intermittently preserved in the sedimentary record from the Antarctic continental shelf, with widespread erosion occurring during major ice sheet advances, and open marine deposition during times of ice sheet retreat. Data from seismic reflection surveys and drill sites from Deep Sea Drilling Project (DSDP) Leg 28 and International Ocean Discovery Program (IODP) Expedition 374 located across the present-day middle continental shelf of the central Ross Sea, indicate the presence of expanded early to middle Miocene sedimentary sections. These include the Miocene Climate Optimum (MCO ∼17-14. 6 Ma), and the Middle Miocene Climate Transition (MMCT ∼14.6-13.9 Ma). Here, we correlate drill core records, wireline logs and reflection seismic data to elucidate the depositional architecture of the continental shelf and reconstruct the evolution and variability of dynamic ice sheets in the Ross Sea during the Miocene. Drill-site data are used to constrain seismic isopach maps that document the evolution of different ice sheets and ice caps which influenced sedimentary processes in the Ross Sea through the early to middle Miocene. In the early Miocene, periods of localized advance of the ice margin are revealed by the formation of thick sediment wedges prograding into the basins. At this time, morainal bank complexes are distinguished along the basin margins suggesting sediment supply derived from marine-terminating glaciers. During the MCO, biosiliceous-bearing sediments are regionally mapped within the depocenters of the major sedimentary basin across the Ross Sea, indicative of widespread open marine deposition with reduced glacimarine influence. At the MMCT, a distinct erosive surface is interpreted as representing large-scale marine-based ice sheet advance over most of the Ross Sea paleo-continental shelf. The regional mapping of the seismic stratigraphic architecture and its correlation to drilling data indicate a regional transition through the Miocene from growth of ice caps and inland ice sheets with marine-terminating margins, to widespread marine-based ice sheets extending across the outer continental shelf in 58the Ross Sea. |
author2 |
Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Pérez, LF De Santis, L McKay, RM Larter, RD Ash, J Bart, PJ Böhm, G Brancatelli, G Brown, I Colleoni, F Dodd, JP Geletti, R Harwood, DM Kuhn, G Laberg, JS Leckie, RM Levy, RH Marschalek, J Mateo, Z Naish, TR Sangiorgi, F Shevenell, A Sorlien, CC Van de Flierdt, T IODP Expedition 374 Scientists |
author_facet |
Pérez, LF De Santis, L McKay, RM Larter, RD Ash, J Bart, PJ Böhm, G Brancatelli, G Brown, I Colleoni, F Dodd, JP Geletti, R Harwood, DM Kuhn, G Laberg, JS Leckie, RM Levy, RH Marschalek, J Mateo, Z Naish, TR Sangiorgi, F Shevenell, A Sorlien, CC Van de Flierdt, T IODP Expedition 374 Scientists |
author_sort |
Pérez, LF |
title |
Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation |
title_short |
Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation |
title_full |
Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation |
title_fullStr |
Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation |
title_full_unstemmed |
Early and middle Miocene ice sheet dynamics in the Ross Sea: results from integrated core-log-seismic interpretation |
title_sort |
early and middle miocene ice sheet dynamics in the ross sea: results from integrated core-log-seismic interpretation |
publisher |
Geological Society of America |
publishDate |
2021 |
url |
http://hdl.handle.net/10044/1/88294 |
geographic |
Antarctic Ross Sea The Antarctic |
geographic_facet |
Antarctic Ross Sea The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Ice Sheet Ross Sea |
op_relation |
GSA Bulletin 0016-7606 http://hdl.handle.net/10044/1/88294 NE/R018219/1 |
op_rights |
This paper is embargoed until publication. 10000-01-01 |
_version_ |
1766192998635274240 |