Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands
The deglaciation of southern Gondwana during the Early Permian was preceded by waxing and waning of the south polar ice sheet. The fluctuations in ice extent are recorded in the sedimentary record by strata separating thick deposits of glacial diamictite from post-glacial mudrock. These deposits spa...
Published in: | Geological Society, London, Special Publications |
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Geological Society of London
2019
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ftnerc:oai:nora.nerc.ac.uk:520163 2023-05-15T13:49:35+02:00 Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands Horan, Kate Stone, Philip Crowhurst, Simon J. Le Heron, D.P. Hogan, K.A. Phillips, E.R. Huuse, M. Busfield, M.E. Graham, A.G.C. 2019 text http://nora.nerc.ac.uk/id/eprint/520163/ https://nora.nerc.ac.uk/id/eprint/520163/1/Abstract%20-%20Glaciated%20Margins.pdf https://doi.org/10.1144/SP475.1 en eng Geological Society of London https://nora.nerc.ac.uk/id/eprint/520163/1/Abstract%20-%20Glaciated%20Margins.pdf Horan, Kate; Stone, Philip; Crowhurst, Simon J. 2019 Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands. In: Le Heron, D.P.; Hogan, K.A. orcid:0000-0002-1256-8010 Phillips, E.R.; Huuse, M.; Busfield, M.E.; Graham, A.G.C., (eds.) Glaciated margins: the sedimentary and geophysical archive. London, UK, Geological Society of London, 131-147. Publication - Book Section PeerReviewed 2019 ftnerc https://doi.org/10.1144/SP475.1 2023-02-04T19:46:36Z The deglaciation of southern Gondwana during the Early Permian was preceded by waxing and waning of the south polar ice sheet. The fluctuations in ice extent are recorded in the sedimentary record by strata separating thick deposits of glacial diamictite from post-glacial mudrock. These deposits span across all of the major Gondwana fragments, now recognized as South Africa, South America, India, Antarctica and Australia, and also occur on the Falklands and Ellsworth Mountains microplates created during break-up of the supercontinent in the Mesozoic. We present sedimentary evidence for the progression of deglaciation from the Falkland Islands microplate using a series of borehole core runs acquired during onshore mineral exploration. Glacial advance and retreat phases are inferred from the Hells Kitchen Member of the Port Sussex Formation; the rock succession that conformably overlies the main body of glacial diamictite known locally as the Fitzroy Tillite Formation. The pulsated nature of the transition to fully post-glacial conditions was accompanied by an intricate interplay of sedimentary processes, including soft sediment deformation, meltwater pulses and turbidity currents. The Falkland Islands core data lend insight into the evolving Early Permian environment and offer an unusually complete view of continental margin deglaciation preserved in the ancient sedimentary record. Supplementary material: Borehole core photographs from the Fitzroy Tillite Formation, Hells Kitchen Member and Black Rock Member for cores DD029 and DD090 are available at https://doi.org/10.6084/m9.figshare.c.4031119.v1 Book Part Antarc* Antarctica Ice Sheet Natural Environment Research Council: NERC Open Research Archive Black Rock Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) Fitzroy ENVELOPE(-66.964,-66.964,-68.189,-68.189) Geological Society, London, Special Publications 475 1 131 147 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The deglaciation of southern Gondwana during the Early Permian was preceded by waxing and waning of the south polar ice sheet. The fluctuations in ice extent are recorded in the sedimentary record by strata separating thick deposits of glacial diamictite from post-glacial mudrock. These deposits span across all of the major Gondwana fragments, now recognized as South Africa, South America, India, Antarctica and Australia, and also occur on the Falklands and Ellsworth Mountains microplates created during break-up of the supercontinent in the Mesozoic. We present sedimentary evidence for the progression of deglaciation from the Falkland Islands microplate using a series of borehole core runs acquired during onshore mineral exploration. Glacial advance and retreat phases are inferred from the Hells Kitchen Member of the Port Sussex Formation; the rock succession that conformably overlies the main body of glacial diamictite known locally as the Fitzroy Tillite Formation. The pulsated nature of the transition to fully post-glacial conditions was accompanied by an intricate interplay of sedimentary processes, including soft sediment deformation, meltwater pulses and turbidity currents. The Falkland Islands core data lend insight into the evolving Early Permian environment and offer an unusually complete view of continental margin deglaciation preserved in the ancient sedimentary record. Supplementary material: Borehole core photographs from the Fitzroy Tillite Formation, Hells Kitchen Member and Black Rock Member for cores DD029 and DD090 are available at https://doi.org/10.6084/m9.figshare.c.4031119.v1 |
author2 |
Le Heron, D.P. Hogan, K.A. Phillips, E.R. Huuse, M. Busfield, M.E. Graham, A.G.C. |
format |
Book Part |
author |
Horan, Kate Stone, Philip Crowhurst, Simon J. |
spellingShingle |
Horan, Kate Stone, Philip Crowhurst, Simon J. Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands |
author_facet |
Horan, Kate Stone, Philip Crowhurst, Simon J. |
author_sort |
Horan, Kate |
title |
Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands |
title_short |
Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands |
title_full |
Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands |
title_fullStr |
Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands |
title_full_unstemmed |
Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands |
title_sort |
sedimentary record of early permian deglaciation in southern gondwana from the falkland islands |
publisher |
Geological Society of London |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/520163/ https://nora.nerc.ac.uk/id/eprint/520163/1/Abstract%20-%20Glaciated%20Margins.pdf https://doi.org/10.1144/SP475.1 |
long_lat |
ENVELOPE(-85.000,-85.000,-78.750,-78.750) ENVELOPE(-66.964,-66.964,-68.189,-68.189) |
geographic |
Black Rock Ellsworth Mountains Fitzroy |
geographic_facet |
Black Rock Ellsworth Mountains Fitzroy |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/520163/1/Abstract%20-%20Glaciated%20Margins.pdf Horan, Kate; Stone, Philip; Crowhurst, Simon J. 2019 Sedimentary record of Early Permian deglaciation in southern Gondwana from the Falkland Islands. In: Le Heron, D.P.; Hogan, K.A. orcid:0000-0002-1256-8010 Phillips, E.R.; Huuse, M.; Busfield, M.E.; Graham, A.G.C., (eds.) Glaciated margins: the sedimentary and geophysical archive. London, UK, Geological Society of London, 131-147. |
op_doi |
https://doi.org/10.1144/SP475.1 |
container_title |
Geological Society, London, Special Publications |
container_volume |
475 |
container_issue |
1 |
container_start_page |
131 |
op_container_end_page |
147 |
_version_ |
1766251777451098112 |