Variations in ice rafted detritus on beaches in the South Shetland Islands: a possible climate proxy

Raised beach ridges on Livingston Island of the South Shetland Islands display variations in both quantity and source of ice rafted detritus (IRD) received over time. Whereas the modern beach exhibits little IRD, all of which is of local origin, the next highest beach (∼250 14 C yr BP ) has large am...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: HALL, BRENDA L., PERRY, ETHAN R.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2004
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Antarctic
The Antarctic
Antarctic Peninsula
South Shetland Islands
Livingston Island
Raised Beach
Antarc*
Antarctic Science
Iceberg*
Online Access:http://dx.doi.org/10.1017/s0954102004002147
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102004002147
Description
Summary:Raised beach ridges on Livingston Island of the South Shetland Islands display variations in both quantity and source of ice rafted detritus (IRD) received over time. Whereas the modern beach exhibits little IRD, all of which is of local origin, the next highest beach (∼250 14 C yr BP ) has large amounts, some of which comes from as far away as the Antarctic Peninsula. Significant quantities of IRD also were deposited ∼1750 14 C yr BP . Both time periods coincide with generally cooler regional conditions and, at least in the case of the ∼250 yr old beach, local glacial advance. We suggest that the increases in ice rafting may reflect periods of greater glacial activity, altered ocean circulation, and/or greater iceberg preservation during the late Holocene. Limited IRD and lack of far-travelled erratics on the modern beach are both consistent with the ongoing warming trend in the Antarctic Peninsula region.

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