Award Abstract # 0819469
Geochemical Characterization of Lavas from the 2005-06 EPR Eruption at 9º 50' N: Implications for Magma Genesis, Evolution, and Transport along a Fast Spreading Mid-Ocean Ridge

NSF Org: OCE
Division Of Ocean Sciences
Recipient: UNIVERSITY OF FLORIDA
Initial Amendment Date: June 19, 2008
Latest Amendment Date: June 19, 2008
Award Number: 0819469
Award Instrument: Standard Grant
Program Manager: Bilal U. Haq
OCE  Division Of Ocean Sciences
GEO  Directorate for Geosciences
Start Date: July 1, 2008
End Date: June 30, 2012 (Estimated)
Total Intended Award Amount: $255,389.00
Total Awarded Amount to Date: $255,389.00
Funds Obligated to Date: FY 2008 = $255,389.00
History of Investigator:
  • Michael Perfit (Principal Investigator)
     mperfit@ufl.edu
Recipient Sponsored Research Office: University of Florida
 1523 UNION RD RM 207
 GAINESVILLE
 FL  US  32611-1941
(352)392-3516
Sponsor Congressional District: 03
Primary Place of Performance: University of Florida
 1523 UNION RD RM 207
 GAINESVILLE
 FL  US  32611-1941
Primary Place of Performance
Congressional District:		 03
Unique Entity Identifier (UEI): NNFQH1JAPEP3
Parent UEI:
NSF Program(s): Marine Geology and Geophysics
Primary Program Source: 01000809DB NSF RESEARCH & RELATED ACTIVIT
Program Reference Code(s): 0000, 1620, OTHR
Program Element Code(s): 162000
Award Agency Code: 4900
Fund Agency Code: 4900
Assistance Listing Number(s): 47.050

ABSTRACT

ABSTRACT

OCE-0819469


Intellectual Merit: Since its designation as a RIDGE 2000 Integrated Study Site (ISS) in 2001, the 8°-11° N segment of the East Pacific Rise (EPR) has become one of the best characterized regions of the global mid-ocean ridge (MOR) system. However, even here our understanding of ocean-ridge volcanism has been significantly limited by the lack of geologic, chemical and petrologic data on individual on- and off-axis Fundamental questions remain regarding the spatial and, in particular, the temporal chemical evolution of fast spreading centers. In 2005-06, a submarine eruption occurred within the EPR ISS (9º 47?-54? N) at exactly the same location as the well-documented 1991-1992 EPR. This cyclic eruption provides a unique opportunity for the proposed multidisciplinary study in that it is the first time ridge geologists will be able to evaluate variations in MOR lava geochemistry at one place over a controlled time period (~15 years). Moreover, pre-eruption seismic data, high-resolution mapping and high-precision 210Po-Pb dating of the lavas from the 2005-06 eruption have resulted in its emergence as the best spatially and temporally-constrained MOR eruption in the world. Together with the dense lava sampling completed since 2006, these data provide an unprecedented opportunity to examine the petrologic and geochemical aspects of the eruption as well as the temporal and spatial changes that accompanied this magmatic event.

The investigators will search for systematic variations in lava chemistry over space and time, as well as differences in fractional crystallization and mixing between lavas erupted in 2005-06 and those erupted in 1991-92. Melt-hosted xenoliths will be studied to reveal details of the magmatic conditions in the source melt lens, as well as for possible signatures of contamination, degassing and water-magma interactions within the sub-seafloor. The project involves laboratory analysis of existing samples, including isotopic, petrologic and studies of volatiles, halogens and high-precision Pb isotopes.

Broader Impacts: This project will provide new quantitative information on the petrologic, geochemical, and thermal evolution of the EPR magma plumbing system, of immediate and significant consequence to achieving Ridge2000 Program goals to integrate and synthesize results across data sets at the East Pacific Rise Integrated Study Site. The project will bring two young scientists into the marine geologic and geochemical field. The principal investigator has been extensively involved in outreach activities over the past decade, and will continue with to co-Principal Investigator to support and develop University of Florida and RIDGE 2000 education and outreach programs both locally and nationally.

PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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(Showing: 1 - 10 of 25)
Carbotte, S.M. , M. Nedimovic, H.D. Carton, J. Canales, J.B. Gill, D. Kelley, M.R. Perfit, "Near-axis melt anomalies and segmentation of axial melt: a common framework for the EPR and Endeavour ISS?" American Geophysical Union 2009 Fall Meeting, San Francisco, CA, , 2009
Fornari, D.J., Von Damm, K.L., Bryce, J., Cowen, J.P., Ferrini, V., Fundis, A., Lilley, M.D., Luther, G.W., Mullineaux, L.S., Perfit, M.R., Prado, F., Rubin, K.H., and 5 others "The East Pacific Rise at 9°-10°N: 25 years of integrated, multidisciplinary oceanic spreading center studies" Oceanography , v.25-1 , 2012 , p.18
Fundis, A.T., M.R. Perfit, S. Soule, D.J. Fornari "Intra-flow morphology variations within a single submarine flow: the 2005-2006 East Pacific Rise eruption." American Geophysical Union 2009 Fall Meeting, San Francisco, CA, , 2009
Fundis, A T., S A Soule, D J Fornari, M R Perfit, "The 2005-2006 Eruption at the East Pacific Rise 9°50N: Detailed Flow Morphology Mapping and Insight Into Emplacement Processes" Annual American Geophysical Union Meeting , 2008
Fundis, A.T., Soule, S.A., Fornari, D.J., and Perfit, M.R., "Paving the seafloor: Volcanic emplacement processes during the 2005-06 eruption at the fast-spreading East Pacific Rise, 9°50´N" Geochemistry, Geophysics, Geosystems, , v.11 , 2010 doi.org/10.1029/2010GC003058
Goss, A.R., M R Perfit, G D *Kamenov, K H Rubin, A T *Fundis, S A Soule, D J Fornari, "Implications for AMC Composition Over Decadal Time Scales and Mantle Heterogeneity Along Fast Spreading Centers." Annual American Geophysical Union Meeting , 2008
Goss, A.R., M R Perfit, G D *Kamenov, K H Rubin, A T *Fundis, S A Soule, D J Fornari, and W.I. Ridley, "Geochemical characterization of axial and off-axis lavas from the 2005-06 eruption along the East Pacific Rise (9° 47-53â?? N): Implications for mantle composition over decadal time scales along fast spreading centers." Geochem. Geophys. Geosyst. , 2010 doi:10.1029/2009GC002977
Goss, A.R., M.R. Perfit, G.D. *Kamenov, K.H. Rubin, S. Soule, D.J. Fornari, W.I. Ridley "Geochemical characterization of lavas from the 2005-06 eruption along the East Pacific Rise (9° 50â??N): Implications for decadal-scale magmagenesis along fast spreading centers" American Geophysical Union 2009 Fall Meeting, San Francisco, CA, , 2009
Mallick, S., V.J. Salters, Geology, M.R. Perfit "Small length scale heterogeneity beneath the East Pacific Rise" American Geophysical Union 2009 Fall Meeting, San Francisco, CA, , 2009
Michael, P.J., M R Perfit, A Palke, D J Fornari, S A Soule, "Observations of CO2 Exsolution in Submarine Lava Flows: The 2005-6 Eruption on the East Pacific Rise, 9°50'N" Annual American Geophysical Union Meeting , 2008
Perfit, M.R., *Wanless, V.D., Ridley, W.I., Klein, E., *Smith, M.C., *Hinds, J.S., *Kutza, S., and Fornari, D.J. "EPR ISS Lava Geochemistry 2 decades of comprehensive sampling and 2 eruptions" Oceanography , v.25-1 , 2012 , p.89
(Showing: 1 - 10 of 25)

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