In:
Journal of Glaciology, Cambridge University Press (CUP), Vol. 39, No. 132 ( 1993), p. 303-315
Abstract:
The debris-rich ice from the bottom 6 m of the 82 m deep CAROLINE (Coastal Antarctic Record of Last Interglacial Natural Environment) ice core reaching bedrock, and from five 2 m long surface cores at Moraine Prudhomme in Terre Adélie (Antarctica) is described and compared to debris-laden ice from the core-drilling site DIO. Isotopic, total-gas content, CO 2 concentration and SEM investigations of embedded particles, together with ice textures and fabrics, rule out “pressure-melting” regelation around bed obstacles or “freezing-on” as possible mechanisms for the debris entrainment at the ice-bedrock interface. It is suggested that the debris entrapment by purely mechanical means (e.g. shearing) is an efficient process in forming basal ice layers (BIL) at sub-freezing temperatures. This process might be dominant at the margin of the Antarctic ice sheet where no ice shelf exists and where a ramp terminus or a buttressing coastal relief induces compressive flow.
Type of Medium:
Online Resource
ISSN:
0022-1430
,
1727-5652
DOI:
10.1017/S0022143000015963
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1993
detail.hit.zdb_id:
2140541-4
SSG:
14
