Skip to Main Content
GEOREF RECORD

Evolution of Neogene volcanism and stress patterns in the glaciated West Antarctic Rift, Marie Byrd Land, Antarctica

Timothy S. Paulsen and Terry J. Wilson
Evolution of Neogene volcanism and stress patterns in the glaciated West Antarctic Rift, Marie Byrd Land, Antarctica (in Neotectonics, seismicity and stress in glaciated regions, Christophe Pascal (prefacer), Iain S. Stewart (prefacer) and Bert L. A. Vermeersen (prefacer))
Journal of the Geological Society of London (March 2010) 167 (2): 401-416

Abstract

The orientations and ages of polygenetic volcano chains, elongate volcano edifices, and elongate summit calderas in Marie Byrd Land, Antarctica, are analysed to determine stress directions during volcanism and coeval glaciation across the West Antarctic Rift. Initiation of volcanism c. 36-34 Ma and major polygenetic volcanism beginning c. 14 Ma are broadly coeval with establishment of significant ice volumes in West Antarctica. Middle-Late Miocene volcanism occurred primarily along roughly north-south volcano chains, whereas latest Miocene-Pleistocene volcanism had a strong east-west preferred orientation across the spatial extent of the province. Anisotropic stress conditions controlled both phases of volcanism, and a rapid rotation in the maximum horizontal stress direction from north-south to east-west occurred as early as c. 6 Ma. Glacial loading and unloading appears to have facilitated volcanism in Marie Byrd Land, but ice margin reconstructions make it unlikely that stress field rotation is a result of flexural stresses imposed by glacial loading cycles. The east-west orientation of latest Miocene to Pleistocene maximum horizontal stress is parallel to the absolute motion of the Antarctic plate for the past 6 Ma, and the north-south to east-west stress field rotation coincides with changes in Antarctic-Pacific Ridge spreading and Pacific basin tectonic events associated with plate reorganization.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 167
Serial Issue: 2
Title: Evolution of Neogene volcanism and stress patterns in the glaciated West Antarctic Rift, Marie Byrd Land, Antarctica
Title: Neotectonics, seismicity and stress in glaciated regions
Author(s): Paulsen, Timothy S.Wilson, Terry J.
Author(s): Pascal, Christopheprefacer
Author(s): Stewart, Iain S.prefacer
Author(s): Vermeersen, Bert L. A.prefacer
Affiliation: University of Wisconsin Oshkosh, Department of Geology, Oshkosh, WI, United States
Affiliation: Geological Survey of Norway, Trondheim, Norway
Pages: 401-416
Published: 201003
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
Meeting name: 33rd international geological congress; Neotectonics and stress state in formerly glaciated regions
Meeting location: Oslo, NOR, Norway
Meeting date: 20080806Aug. 6, 2008
References: 105
Accession Number: 2010-030983
Categories: Structural geologyStratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
Secondary Affiliation: University of Plymouth, GBR, United KingdomDelft University of Technology, NLD, NetherlandsOhio State University, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201018
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal