Miocene glacial stratigraphy and landscape evolution of the western Asgard Range, Antarctica

D. R. Marchant, G. H. Denton, D. E. Sugden, C. C. Swisher

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

40Ar/39Ar dated in-situ volcanic ashfall deposits indicate that the surficial stratigraphy of the western Asgard Range in the Dry Valleys region extends back at least to 15.0 Ma. The preservation of Miocene and Pliocene colluvium and drift on valley slopes shows that major bedrock landforms are relict and that little slope evolution has occurred during the last 15.0 Ma. Although glaciers played a role in shaping the present topography of the western Asgard Range, the main landforms were probably cut by progressive scarp retreat, propagation of embayments with theater-shaped heads, and isolation of buttes and mesas prior to 15.0 Ma. A phase of wet-based alpine glacier expansion is also recognised in theater-headed embayments prior to 15.0 Ma ago, along with a late-Miocene phase of northeast-flowing ice-sheet overriding between 14.8/ 15.2 Ma and 13.6 Ma. -from Authors

Original languageEnglish (US)
Pages (from-to)303-330
Number of pages28
JournalGeografiska Annaler, Series A
Volume75 A
Issue number4
DOIs
StatePublished - 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geography, Planning and Development
  • Geology

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