Stratigraphy of the Ross Supergroup, Central Transantarctic Mountains

  1. Mort D. Turner and
  2. John E. Splettstoesser
  1. Edmund Stump

Published Online: 16 MAR 2013

DOI: 10.1029/AR036p0225

Geology of the Central Transantarctic Mountains

Geology of the Central Transantarctic Mountains

How to Cite

Stump, E. (1986) Stratigraphy of the Ross Supergroup, Central Transantarctic Mountains, in Geology of the Central Transantarctic Mountains (eds M. D. Turner and J. E. Splettstoesser), American Geophysical Union, Washington, D. C.. doi: 10.1029/AR036p0225

Author Information

  1. Department of Geology, Arizona State University, Tempe, Arizona 85287

Publication History

  1. Published Online: 16 MAR 2013
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780875901848

Online ISBN: 9781118664797

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Keywords:

  • Beardmore-Scott;
  • Duncan and Taylor formation;
  • Goldie and La Gorce formation;
  • Petrography and stratigraphy;
  • Shackleton Glacier;
  • Volcanic and sedimentary rocks;
  • Wyatt and Greenlee formation

Summary

In the central Transantarctic Mountains, rocks of the late Precambrian-early Paleozoic metamorphic complex are assigned to the Ross Supergroup. The oldest rocks are the Beardmore Group, including the Goldie, Duncan, and La Gorce formations. These are the metamorphic equivalents of evenly bedded graywacke, sandstone, and shale, thought to have been deposited in deep-sea fans through the action of turbidity currents. In the eastern portion of the area the La Gorce Formation is overlain and intruded by portions of the late Precambrian Wyatt Formation, which in most parts is a massive, silicic metafelsite distinguished by phenocrysts of biotite, in addition to quartz and feldspar. Formations of the Cambrian Liv Group occur in the Shackleton Glacier and Duncan Mountains areas. In the former area the phyllites and fine-grained quartzites of the Greenlee Formation are overlain by the Taylor Formation, a highly varied assemblage of metavolcanic and metasedimentary rock types. The predominant volcanic rocks are metafelsites which originated as ash flow tuffs and lavas. Also present are ashfall tuffs and basaltic lavas. Sedimentary rock types include marbles, volcaniclastic rocks, and cross-bedded quartzites. In the Duncan Mountains area the Fairweather Formation contains rock types similar to those of the Taylor Formation, although the degree of metamorphism is somewhat higher. Coarsely crystalline, snow-white marble, found at places in the Taylor and Fairweather formations, is designated the Henson Marble Member of both formations.