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Record #96622:
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MARC recordSeismic evidence for a thin basal layer at a second location on Ice Stream B, Antarctica (abstract) / Donald D. Blankenship, S.T. Rooney, Richard B. Alley, Charles R. Bentley.
| Title: | Seismic evidence for a thin basal layer at a second location on Ice Stream B, Antarctica (abstract) / Donald D. Blankenship, S.T. Rooney, Richard B. Alley, Charles R. Bentley. |
| Author(s): | Blankenship, Donald D. Rooney, S. T. Alley, Richard B. Bentley, Charles R. |
| Date: | 1989. |
| Publisher: | Cambridge: International Glaciological Society |
| In: | Annals of Glaciology. (1989.), Vol. 12 (1989) |
| Abstract: | Seismic experiments have shown metres-thick layer of unconsolidated sediment beneath Ice Stream B at location several hundred km up-stream from grounding line. It has been proposed that coupling line exists about 100 km up-stream from grounding line. Above coupling line, dynamic behaviour of ice stream may be dominated by deformation within basal sediment layers and erosion could be taking place at bottom of this layer. Below coupling line, it is suggested that sliding on lubricating water film becomes important and that subglacial sediments are deposited as delta. Preliminary results from 30 km seismic profile near coupling line of ice stream show prominent horizontal reflector several metres below base of ice; this is underlain by sequence of reflectors, each with down-stream dip of about 1. It is believed that horizontal and dipping reflectors represent, respectively, topsets and foresets of hypothesized delta. |
| Notes: | Annals of Glaciology. Vol. 12 :200 (1989). |
| Keywords: | 551.331.5 -- Glacial erosion and protection. Sub-glacial topography. 551.321.62 -- Ice sounding, seismic methods and sonar. 551.32 -- Glaciology. 551.324 -- Land ice. 551.324.54 -- Land ice, flow of particular glaciers: Ice Stream B. E5 -- Glaciology: land ice. (*7) -- Antarctic regions. (*767.3) -- Gould Coast. |
| SPRI record no.: | 96622 |
LDR 02100naa#a2200000#a#4500 001 SPRI-96622 005 20231203043439.0 007 ta 008 231203s1989####enk###|##|###|0||#0|eng#d 035 ## ‡aSPRI-96622 040 ## ‡aUkCU-P‡beng‡eaacr 245 00 ‡aSeismic evidence for a thin basal layer at a second location on Ice Stream B, Antarctica (abstract) /‡cDonald D. Blankenship, S.T. Rooney, Richard B. Alley, Charles R. Bentley. 260 ## ‡aCambridge :‡bInternational Glaciological Society,‡c1989. 300 ## ‡ap. 200. 500 ## ‡aAnnals of Glaciology. Vol. 12 :200 (1989). 520 3# ‡aSeismic experiments have shown metres-thick layer of unconsolidated sediment beneath Ice Stream B at location several hundred km up-stream from grounding line. It has been proposed that coupling line exists about 100 km up-stream from grounding line. Above coupling line, dynamic behaviour of ice stream may be dominated by deformation within basal sediment layers and erosion could be taking place at bottom of this layer. Below coupling line, it is suggested that sliding on lubricating water film becomes important and that subglacial sediments are deposited as delta. Preliminary results from 30 km seismic profile near coupling line of ice stream show prominent horizontal reflector several metres below base of ice; this is underlain by sequence of reflectors, each with down-stream dip of about 1. It is believed that horizontal and dipping reflectors represent, respectively, topsets and foresets of hypothesized delta. 650 07 ‡a551.331.5 -- Glacial erosion and protection. Sub-glacial topography.‡2udc 650 07 ‡a551.321.62 -- Ice sounding, seismic methods and sonar.‡2udc 650 07 ‡a551.32 -- Glaciology.‡2udc 650 07 ‡a551.324 -- Land ice.‡2udc 650 07 ‡a551.324.54 -- Land ice, flow of particular glaciers: Ice Stream B.‡2udc 650 07 ‡aE5 -- Glaciology: land ice.‡2local 651 #7 ‡a(*7) -- Antarctic regions.‡2udc 651 #7 ‡a(*767.3) -- Gould Coast.‡2udc 700 1# ‡aBlankenship, Donald D. 700 1# ‡aRooney, S. T. 700 1# ‡aAlley, Richard B. 700 1# ‡aBentley, Charles R. 773 0# ‡7nnas ‡tAnnals of Glaciology. ‡gVol. 12 (1989) ‡wSPRI-60773 917 ## ‡aUnenhanced record from Muscat, imported 2019 948 3# ‡a20231203