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A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil - San Sebastián, Magellan, Otway, Skyring and Bella Vista lobes

Darvill, C.M.; Stokes, C.R.; Bentley, M.J.; Lovell, H.

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil - San Sebastián, Magellan, Otway, Skyring and Bella Vista lobes Thumbnail


Authors

C.M. Darvill

H. Lovell



Abstract

This paper presents a glacial geomorphological map of the landforms created by five large ice lobes that extended eastwards from the southernmost reaches of the Patagonian Ice Sheet during the Quaternary period. The study is focussed on Tierra del Fuego, but also updates previous mapping of the Skyring and Otway lobes, and the resulting level of detail and extent is a significant advance on previous work in the region. The map has been created as the necessary precursor for an improved understanding of the glacial history of the region, and to underpin a programme of dating glacial limits in the region. It was produced using Landsat ETM+ and ASTER satellite imagery and vertical aerial photography, supplemented by Google Earth™ imagery and field-checking. Eleven landform types were mapped: moraine ridges, subdued moraine topography, kettle-kame topography, glacial lineations, irregular and regular hummocky terrain, irregular dissected ridges, eskers, meltwater channels, former shorelines and outwash plains. The map reveals three important characteristics of the glacial geomorphology. First, the geomorphic systems are largely dominated by landforms associated with meltwater (channels, outwash plains and kettle-kame topography). Second, there is a difference in the nature of landforms associated with the northern three ice lobes, where limits are generally marked by numerous clear moraine ridges, compared to those to the south, where hummocky terrain and drift limits prevail. Finally, cross-cutting landforms offer evidence of multiple advances, in places, which has implications for the timing of limit deposition, and thus for the design and interpretation of a dating programme.

Citation

Darvill, C., Stokes, C., Bentley, M., & Lovell, H. (2014). A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil - San Sebastián, Magellan, Otway, Skyring and Bella Vista lobes. Journal of Maps, 10(3), 500-520. https://doi.org/10.1080/17445647.2014.890134

Journal Article Type Article
Publication Date Feb 19, 2014
Deposit Date Feb 20, 2014
Publicly Available Date Mar 28, 2024
Journal Journal of Maps
Publisher Taylor and Francis Group
Peer Reviewed Peer Reviewed
Volume 10
Issue 3
Pages 500-520
DOI https://doi.org/10.1080/17445647.2014.890134
Keywords Glacial geomorphology, Tierra del Fuego, Patagonia, Chile, Argentina.

Files

Published Journal Article (1.1 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© 2014 The Author(s). Published by Taylor & Francis.
This is an Open Access article. Non-commercial re-use, distribution, and reproduction in any medium,
provided the original work is properly attributed, cited, and is not altered, transformed, or built upon in
any way, is permitted. The moral rights of the named author(s) have been asserted.





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