Geochemistry and Petrologic Evolution of Felsic Volcanoes in Western Marie Byrd Land, AntarcticaEntry ID: NSF-ANT05-36526
Abstract: This project uses geochemical studies to determine the origin of volcanic rocks from Marie Byrd Land (MBL), Antarctica. Surprisingly, adjacent volcanoes in the MBL have dramatically different compositions, ranging from phonolite to trachyte to rhyolite. This diversity offers an opportunity to constrain the processes responsible for generating silica oversaturated and undersaturated magmas in a ... single geologic setting. Previous work suggests that the most obvious and simplest explanation--crustal contamination--is not a significant factor, and that polybaric fractional crystallization is the major cause. This study evaluates these factors through analyses and interpretation of trace and rare earth element abundances, as well as Sr and Nd isotopic ratios. The broader impacts include outreach programs to the Girl Scouts of America, and dissemination of results through publications and meetings.
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Start Date: 2006-08-01Stop Date: 2010-07-31
ISO Topic Category
Data Set Progress
Distribution Media: online, ftp, www
Phone: 44 1344 85 4520
Fax: 44 1344 85 4898
Email: cdhewitt at meto.gov.uk
Hadley Centre for Climate Prediction and Research United Kingdom Meteorological Office London Road
Province or State: Berkshire
Postal Code: RG12 2SY
Country: United Kingdom
Hewitt, C.D., and Mitchell, J.F.B., 1996: GCM simulations of the
climate of 6 kyr BP : Mean changes and interdecadal
variability. J. Climate, 9, 3505-3529.
Johns,T.C., R.E. Carnell, J.F. Crossley, J.M. Gregory,
J.F.B. Mitchell, C.A. Senior, S.F.B. Tett, and R.A. Wood, 1997. The
second Hadley Centre coupled ocean-atmosphere GCM : Model Description,
Spinup and Validation. Climate Dyn., 13, 103-134.
Hewitt, C.D., and Mitchell, J.F.B., 1997 : Radiative forcing and
response of a GCM to ice age boundary conditions : cloud feedback and
climate sensitivity. Climate Dynamics, 13, 821-834.
Creation and Review Dates
DIF Creation Date: 2005-06-14
Last DIF Revision Date: 2005-06-20