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Southeastern Section - 63rd Annual Meeting (10–11 April 2014)

Paper No. 9
Presentation Time: 3:55 PM

THE CENTRAL ATLANTIC MAGMATIC PROVINCE: A VIEW FROM SOUTHWEST VIRGINIA MAFIC DIKES


WHALEN, Lisa M., Geoscience, Virginia Tech, Blacksburg, VA 24061, GAZEL, Esteban, Department of Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, VA 24061, WHALEN, William T., Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, BIZIMIS, Michael, Department of Earth and Ocean Sciences, University of South Carolina, 701 Sumter Street, EWS 617, Columbia, SC 29208 and HENIKA, William S., Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, VA 24061-0420, lashley@vt.edu

The formation mechanism of the Central Atlantic Magmatic Province (CAMP) has been hotly debated since it was suggested that a mantle plume was the primary mechanism for the breakup of Pangaea. Those favoring a more passive mechanism have cited the lack of geochemical evidence for the involvement of a mantle plume as well as no current hotspot. In addition mantle potential temperatures computed from primitive melts are too cold for the involvement of a mantle plume. Diabase dikes were sampled in Virginia for major and trace element data as well as Sr, Nd, and Pb isotopic ratios. AFC modelling and Zr/Y -Nb/Y (delta Nb) systematics were used to investigate mantle sources and to evaluate potential formation mechanisms for the LIP.

Session No. 11

Volcanology, Magmatism, Geochemistry
Thursday, 10 April 2014: 1:00 PM-5:00 PM
Cascades (Inn and Conference Center at Virginia Tech)
Geological Society of America Abstracts with Programs. Vol. 46, No. 3, p.20
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