Transantarctic Mountains


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Transantarctic Mountains,

mountain chain stretching across Antarctica from Victoria Land to Coats Land; separating the E Antarctic and W Antarctic subcontinents. Mt. Markham (14,275 ft/4,351 m high), near the Ross Ice Shelf, is the highest peak. Its basement rocks, similar to rocks found in Australia, S Africa, and South America, give credibility to the theory of continental drift.

Transantarctic Mountains

 

a system of mountain ranges in Antarctica that has the structure of a large horst.

The Transantarctic Mountains extend for nearly 4,000 km from the east coast of the Weddell Sea to the west coast of the Ross Sea and form the boundary between East and West Antarctica. The system includes the Pensacola, Thiel, Horlick, and Queen Maud mountains, as well as the Queen Elizabeth and Queen Alexandra ranges. It is 200 to 600 km wide and 2,000 to 3,000 m high; the maximum elevation is 4,530 m (Mount Kirkpatrick in the Queen Alexandra Range).

The basement of the Transantarctic Mountains is composed of metamorphic Precambrian rocks, such as schists, gneisses, quartzites, marbles, and amphibolites. The overlying portion consists of Lower Paleozoic sedimentary and igneous rocks (such as phyllites, sandstones, and conglomerates), and this is capped mainly by Middle and Upper Paleozoic and Mesozoic sandstones and shales, along with Mesozoic gabbro and diabase intrusions known as the Beacon Series. Hard coal deposits are associated with this series.

The Transantarctic Mountains were first seen by the British expedition of J. Ross in 1841 in Victoria Land. The mountain ranges in the interior of Antarctica were discovered by the British expeditions of R. Scott in 1903 and E. Shackleton in 1909, by R. Amundsen’s Norwegian expedition in 1911, and by later expeditions.

L. I. DUBROVIN

References in periodicals archive ?
2), and the stronger temperature-pressure correlations during December along the Transantarctic Mountains (Fig.
I have never seen a polar book that is so focused on our canine friends, but it also shows the scenery of the Transantarctic Mountains vividly in brilliant 24-hour sunlight, engulfing storms, 24-hour winter darkness, and amazing celestial twilight.
1990, New approaches in fission track geochronology as a tectonic tool: Example from the Transantarctic Mountains.
The present location of Patagonia is indicated in figure 1, as well as the late Paleozoic suture with the rest of South America and the early Paleozoic continental margin of the Transantarctic Mountains in East Antarctica.
Caption: The Transantarctic Mountains stretch 3,500 kilometers between the Ross Sea and the Weddell Sea and form the boundary between East Antarctica and West Antarctica.
The latest models based on integrated geophysical analysis assume that multiple mechanisms have contributed to the uplift of the Transantarctic Mountains (cf.
The research is based on a study of extraterrestrial debris found in granite from Miller Butte, in the Transantarctic Mountains, and a layer of cosmic dust represented in two Antarctic ice cores.
Coal has been found in two regions in Antarctica--the Transantarctic Mountains and Prince Charles Mountains; iron ore is widespread in surface rocks in Antarctica and has been traced deep under the ice, but the iron content has been estimated at only 35%.
Now, geochemical analyses of rock samples taken from the Transantarctic Mountains hint instead that portions of East Antarctica occupied that spot, Goodge and his colleagues report in the July 11 Science.
The Transantarctic Mountains (see map, part 2) stretch across Antarctica.
Jon said: "There is virtually no snowfall each year and the transantarctic mountains dam the advance of ice.
5 percent of that lies over West Antarctica, which is separated from the east by the Transantarctic Mountains.

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