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Earth Institute Research Projects

Testing the Processes of Melt Differentiation in the Mexican Volcanic Belt

Lead PI: Dr. Susanne M. Straub

Unit Affiliation: Geochemistry, Lamont-Doherty Earth Observatory (LDEO)

January 2008 - July 2013
Inactive
Central America ; North America ; Lamont Doherty Earth Observatory (LDEO) ; Nacional Autónoma de México Centro de Geociencias (UNAM-CGEO) ; Kilbride, Scotland ; Eugene, OR
Project Type: Research

DESCRIPTION: The project targeted unusually Ni-rich olivines that were reported from young volcanic rocks in Transmexican Volcanic Belt. We investigated olivines from a range of basaltic to andesitic rocks from composite volcano Popocatepetl and its surrounding monogenetic volcanoes.

OUTCOMES: Results show that high-Ni olivines are common in basaltic and andesitic melts. The entirety of compositonal systematics and spatial and temporal constraints show that melts crystallizing high-Ni olivines are formed >50 km deep in the Earth's mantle that is filtrated by silicic components released from the subducting slab that passes at ca. 100 km depth beneath the arc.

SPONSOR:

National Science Foundation (NSF)

FUNDED AMOUNT:

$224,156

RESEARCH TEAM:

Arturo Gomez-Tuena, Ramon Espinasa-Perena, Finlay Stuart, Ilya Bindeman

EXTERNAL COLLABORATORS:

Universidad Nacional Autónoma de México Centro de Geociencias (UNAM-CGEO), Centro Nacional de Prevención de Desastres (CENAPRED), Scottish Universities Environmental Research Centre (SUERC), University of Oregon

PUBLICATIONS:

Straub, S.M., Gomez-Tuena, A., Stuart, F.M., Zellmer, G.F., Espinasa-Perena, R., Cai, M.Y., Iizuka, Y., 2011. Formation of hybrid arc andesites beneath thick continental crust. Earth Planet Sci Lett, 303: 337-347, doi:10.1016/j.epsl.2011.01.013.

Straub, S.M., Gomez-Tuena, A., Zellmer, G.F., Espinasa-Perena, R., Stuart, F.M., Cai, Y., Langmuir, C.H., Martin-Del Pozzo, A., Mesko, G.T., 2013a. The processes of melt differentiation in arc volcanic rocks: Insights from OIB-type arc magmas in the central Mexican Volcanic Belt. J Petrol, 54 (4): 665-701, doi:10.1093/petrology/egs081.

Straub, S.M., Zellmer, G.F., Gómez-Tuena, A., Espinasa-Perena, R., Martin-Del Pozzo, A.L., Stuart, F.M., Langmuir, C.H., 2014. A genetic link between silicic slab components and calc-alkaline arc volcanism in central Mexico In: Gomez-Tuena, A., Straub, S.M., Zellmer, G.F. (Eds.), Orogenic Andesites and Crustal Growth Geological Society London Special Publication 385, pp. 31-64, doi 10.1144/SP385.14.

KEYWORDS

volcanic arc high-ni olivines pryoxenites andesite petrogenesis

THEMES

Earth fundamentals