Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica
The geochemical and geochronological fingerprint of rock debris eroded and carried by ice streams may be used to identify the provenance of iceberg-rafted debris (IRD) in the marine sediment record. During deglacial times it has been shown that there is an increase in IRD accumulation in marine sedi...
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AGU, abstract #C34B-07
2016
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ftawi:oai:epic.awi.de:46207 2023-05-15T13:00:07+02:00 Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica Hemming, Sidney R. Williams, Trevor Boswell, S. Licht, Kathy Agrios, L. Brachfeld, Stefanie van de Flierdt, Tina Kuhn, Gerhard Hillenbrand, Claus-Dieter Zhai, X. 2016-12 https://epic.awi.de/id/eprint/46207/ http://adsabs.harvard.edu/abs/2016AGUFM.C34B.07H https://hdl.handle.net/10013/epic.1fe93e58-6299-48c8-8dff-d9f0d8d5beae unknown AGU, abstract #C34B-07 Hemming, S. R. , Williams, T. , Boswell, S. , Licht, K. , Agrios, L. , Brachfeld, S. , van de Flierdt, T. , Kuhn, G. orcid:0000-0001-6069-7485 , Hillenbrand, C. D. and Zhai, X. (2016) Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica , American Geophysical Union, Fall Meeting 2016, San Francisco, 12 December 2016 - 16 December 2016 . hdl:10013/epic.1fe93e58-6299-48c8-8dff-d9f0d8d5beae EPIC3American Geophysical Union, Fall Meeting 2016, San Francisco, 2016-12-12-2016-12-16AGU, abstract #C34B-07 Conference notRev 2016 ftawi 2021-12-24T15:43:34Z The geochemical and geochronological fingerprint of rock debris eroded and carried by ice streams may be used to identify the provenance of iceberg-rafted debris (IRD) in the marine sediment record. During deglacial times it has been shown that there is an increase in IRD accumulation in marine sediments underlying the western limb of the Weddell Gyre. We seek to find the provenance of this IRD, identify the ice streams contributing to the IRD load, and interpret the geographic sequence of ice sheet retreat in the Weddell Sea embayment for the last three deglaciations. In December 2014 we conducted fieldwork to collect samples of rock and sediment debris carried by three of the major ice streams draining the Weddell Sea embayment: the Foundation Ice Stream, the Academy Glacier, and the Recovery Glacier. We sampled both modern moraines at the edges of the ice streams and older till on hillsides next to the ice streams. In addition to rocks representing the geology of local outcrops, we found that each of the three ice streams carries a characteristic set of erratic lithologies from further upstream, giving clues to the geology hidden under the ice sheet. Downstream, subglacial till and proximal glaciomarine sediment from existing core sites located at the edge of the Filchner and Ronne Ice Shelves, collected on past expeditions of the RV Polarstern, characterize the geochemical and geochronological fingerprint along ice flow lines extending from the ice streams. Finally, two deep-water RV Polarstern sites contain a continuous record of IRD sourced from the set of Weddell embayment ice streams over the last few glacial cycles. Here we present new 40Ar/39Ar hornblende and biotite thermochronological data from individual mineral grains, K-Ar from the silt fraction, and U-Pb zircon geochronology from the onshore tills and offshore sediments. Using this data we will discuss provenance matching between the IRD and the ice streams, and the possibilities for using provenance to understand ice sheet dynamics over the course of glacial cycles. Conference Object Academy Glacier Antarc* Antarctica Foundation Ice Stream Ice Sheet Ice Shelves Recovery Glacier Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Academy Glacier ENVELOPE(-60.397,-60.397,-84.250,-84.250) Foundation Ice Stream ENVELOPE(-60.000,-60.000,-83.250,-83.250) Recovery Glacier ENVELOPE(-25.500,-25.500,-81.166,-81.166) Weddell Weddell Sea |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The geochemical and geochronological fingerprint of rock debris eroded and carried by ice streams may be used to identify the provenance of iceberg-rafted debris (IRD) in the marine sediment record. During deglacial times it has been shown that there is an increase in IRD accumulation in marine sediments underlying the western limb of the Weddell Gyre. We seek to find the provenance of this IRD, identify the ice streams contributing to the IRD load, and interpret the geographic sequence of ice sheet retreat in the Weddell Sea embayment for the last three deglaciations. In December 2014 we conducted fieldwork to collect samples of rock and sediment debris carried by three of the major ice streams draining the Weddell Sea embayment: the Foundation Ice Stream, the Academy Glacier, and the Recovery Glacier. We sampled both modern moraines at the edges of the ice streams and older till on hillsides next to the ice streams. In addition to rocks representing the geology of local outcrops, we found that each of the three ice streams carries a characteristic set of erratic lithologies from further upstream, giving clues to the geology hidden under the ice sheet. Downstream, subglacial till and proximal glaciomarine sediment from existing core sites located at the edge of the Filchner and Ronne Ice Shelves, collected on past expeditions of the RV Polarstern, characterize the geochemical and geochronological fingerprint along ice flow lines extending from the ice streams. Finally, two deep-water RV Polarstern sites contain a continuous record of IRD sourced from the set of Weddell embayment ice streams over the last few glacial cycles. Here we present new 40Ar/39Ar hornblende and biotite thermochronological data from individual mineral grains, K-Ar from the silt fraction, and U-Pb zircon geochronology from the onshore tills and offshore sediments. Using this data we will discuss provenance matching between the IRD and the ice streams, and the possibilities for using provenance to understand ice sheet dynamics over the course of glacial cycles. |
format |
Conference Object |
author |
Hemming, Sidney R. Williams, Trevor Boswell, S. Licht, Kathy Agrios, L. Brachfeld, Stefanie van de Flierdt, Tina Kuhn, Gerhard Hillenbrand, Claus-Dieter Zhai, X. |
spellingShingle |
Hemming, Sidney R. Williams, Trevor Boswell, S. Licht, Kathy Agrios, L. Brachfeld, Stefanie van de Flierdt, Tina Kuhn, Gerhard Hillenbrand, Claus-Dieter Zhai, X. Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica |
author_facet |
Hemming, Sidney R. Williams, Trevor Boswell, S. Licht, Kathy Agrios, L. Brachfeld, Stefanie van de Flierdt, Tina Kuhn, Gerhard Hillenbrand, Claus-Dieter Zhai, X. |
author_sort |
Hemming, Sidney R. |
title |
Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica |
title_short |
Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica |
title_full |
Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica |
title_fullStr |
Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica |
title_full_unstemmed |
Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica |
title_sort |
using sediment provenance to study ice streams in the weddell sea embayment of antarctica |
publisher |
AGU, abstract #C34B-07 |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/46207/ http://adsabs.harvard.edu/abs/2016AGUFM.C34B.07H https://hdl.handle.net/10013/epic.1fe93e58-6299-48c8-8dff-d9f0d8d5beae |
long_lat |
ENVELOPE(-60.397,-60.397,-84.250,-84.250) ENVELOPE(-60.000,-60.000,-83.250,-83.250) ENVELOPE(-25.500,-25.500,-81.166,-81.166) |
geographic |
Academy Glacier Foundation Ice Stream Recovery Glacier Weddell Weddell Sea |
geographic_facet |
Academy Glacier Foundation Ice Stream Recovery Glacier Weddell Weddell Sea |
genre |
Academy Glacier Antarc* Antarctica Foundation Ice Stream Ice Sheet Ice Shelves Recovery Glacier Weddell Sea |
genre_facet |
Academy Glacier Antarc* Antarctica Foundation Ice Stream Ice Sheet Ice Shelves Recovery Glacier Weddell Sea |
op_source |
EPIC3American Geophysical Union, Fall Meeting 2016, San Francisco, 2016-12-12-2016-12-16AGU, abstract #C34B-07 |
op_relation |
Hemming, S. R. , Williams, T. , Boswell, S. , Licht, K. , Agrios, L. , Brachfeld, S. , van de Flierdt, T. , Kuhn, G. orcid:0000-0001-6069-7485 , Hillenbrand, C. D. and Zhai, X. (2016) Using Sediment Provenance to Study Ice Streams in the Weddell Sea Embayment of Antarctica , American Geophysical Union, Fall Meeting 2016, San Francisco, 12 December 2016 - 16 December 2016 . hdl:10013/epic.1fe93e58-6299-48c8-8dff-d9f0d8d5beae |
_version_ |
1766189102578794496 |