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Raimundo Brahm Scott

Raimundo Brahm Scott

Email:<http://www.privatedaddy.com/?q=ci4ecihaRmlvSVV7eUMNSUM-2FalN6UEpP_684>
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Tertiary education

  • 2014-16
  • (MSc) Geology – University of Chile, Chile
  • 2008-13
  • (BSc) Geology – University of Chile, Chile

Masters Research

Raimundo Brahm Scott

Origin of trachyte lavas of the Quetrupillán Volcanic Complex, Chile (39°30’S): examples of residual melts in a rejuvenated crystalline mush reservoir

PhD Research

Title:

“Subduction zone volatile cycles of Northern Japan”

Aims

Water is the most abundant volatile species in subduction zone magmas, critical in the generation and evolution of arc magmas and in driving explosive volcanism. Determining the amount of water in arc magmas and its variation during magmatic evolution, and from arc front to rear-arc, has therefore been the subject of many research efforts. This research will investigate the volatile cycles in subduction zones, i.e. how the role of water and other volatile species may change in the generation and evolution of magmas along and across an active subduction zone, using quaternary eruptives from Japan. This is a classical area displaying geochemical variations from tholeiitic compositions in the fore-arc through calc-alkaline rocks in the main arc and finally alkaline compositions in the rear-arc.

Objectives

  • Compare volatile contents in primitive rock samples from different volcanic centres across and along the NE Japanese arc, and evaluate the effect of volatiles content in arc magma generation.
  • Study the effect of volatiles in magma differentiation.

Methods

  • Measure of volatile (H2O, CO2, S, Cl, F) contents in melt inclusions with FTIR (Fourier-transform infrared) spectroscopy, EMPA (electron microprobe analysis) and SIMS (secondary ion mass spectrometry).
  • Measure of water in nominally anhydrous minerals (NAM’s) with FTIR and SIMS.
  • Calculate water contents through thermodynamic models of mineral – melt equilibria (hygrometers).

Research Interests

Raimundo Brahm Scott
  • Petrogenesis of arc magmatism

  • Whole rock and mineral chemistry

  • Melt inclusions

  • Fieldwork
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    Publications

    • Journal Articles

    • Brahm, R., Parada, M.A., Morgado, E., Contreras, C. and McGee, L.E., 2018. Origin of Holocene trachyte lavas of the Quetrupillán volcanic complex, Chile: Examples of residual melts in a rejuvenated crystalline mush reservoir. Journal of Volcanology and Geothermal Research, 357: 163-176.
    • McGee, L.E., Brahm, R., Rowe, M.C., Handley, H.K., Morgado, E., Lara, L.E., Turner, M.B., Vinet, N., Parada, M.Á. and Valdivia, P., 2017. A geochemical approach to distinguishing competing tectono-magmatic processes preserved in small eruptive centres. Contributions to Mineralogy and Petrology, 172(6).
    • Conference Abstracts

    • Brahm, R., Parada, M-A., Morgado, E., Contreras, C., 2016 Trachytic lavas of the Quetrupillán Volcanic Complex, Chile (39°30’S): examples of rejuvenation of a crystalline mush reservoir (poster presentation), presented at Cities on Volcanoes 9, IAVCEI, Puerto Varas, Chile, 20 – 25 Nov.
    • Brahm, R., Parada, M-A., Morgado, E., Contreras, C., 2015. Pre-eruptive rejuvenations of crystalline mush by reservoir heating: the case of trachy-dacitic lavas of Quetrupillán Volcanic Complex, Chile (39º30’ lat. S) (poster presentation), presented at 2015 Fall Meeting, AGU, San Francisco, California, 14 – 18 Dec.
    • Brahm, R., Parada, M-A., Morgado, E., Contreras, C., 2015. Volcanismo traquidacítico en la Zona Volcánica Sur de los Andes: caso del Vn. Quetrupillán (39º30’ lat. S) (poster presentation), presented at XIV Congreso Geologico Chileno, La Serena, Chile, 4 – 8 Oct.

    Photos

    Raimundo Brahm Scott
    Raimundo Brahm Scott