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Mysteries Of Antarctic Mountains Revealed

Date:
July 24, 2007
Source:
The Earth Institute at Columbia University
Summary:
The 3,000-kilometer-long Transantarctic Mountains are a dominant feature of the Antarctic continent, yet up to now scientists have been unable to adequately explain how they formed. In a new study, geologists report that the mountains appear to be the remnant edge of a gigantic high plateau that began stretching and thinning some 105 million years ago, leaving the peaks curving along the edge of a great plain. This study revolutionizes thinking about Antarctica's evolution.
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Transantarctic Mountains, Northern Victoria Land, view from close to Cape Roberts.
Credit: Hannes Grobe, Alfred Wegener Institute for Polar and Marine Research, Germany

The 3,000-kilometer-long Transantarctic Mountains are a dominant feature of the Antarctic continent, yet up to now scientists have been unable to adequately explain how they formed.

In a new study, geologists report that the mountains appear to be the remnant edge of a gigantic high plateau that began stretching and thinning some 105 million years ago, leaving the peaks curving along the edge of a great plain.

This study revolutionizes thinking about Antarctica's evolution. Previous studies have discussed ways in which the mountains may have risen; the current study says they were already high long ago, and that the adjacent land sank. After the mountain chain was isolated, its topography, with summits up to 4.5 kilometers high, was accentuated by erosion caused by glaciers.

Several of the researchers did extensive field work in Antarctica to collect rock samples and geophysical data that back their ideas.

The work, led by scientists at Columbia University's Lamont-Doherty Earth Observatory, appears in the current issue of Geology, which is published by the Geological Society of America.


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The above post is reprinted from materials provided by The Earth Institute at Columbia University. Note: Materials may be edited for content and length.


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The Earth Institute at Columbia University. "Mysteries Of Antarctic Mountains Revealed." ScienceDaily. ScienceDaily, 24 July 2007. <www.sciencedaily.com/releases/2007/07/070720095954.htm>.
The Earth Institute at Columbia University. (2007, July 24). Mysteries Of Antarctic Mountains Revealed. ScienceDaily. Retrieved August 29, 2015 from www.sciencedaily.com/releases/2007/07/070720095954.htm
The Earth Institute at Columbia University. "Mysteries Of Antarctic Mountains Revealed." ScienceDaily. www.sciencedaily.com/releases/2007/07/070720095954.htm (accessed August 29, 2015).

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