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Thermobarometric implications of clinopyroxene chemistry in the Plio-Quaternary magmas of Gran Canaria (Canary Islands, Spain)

AuthorsAulinas, M.; Gimeno, D,; Fernandez-Turiel, J. L. ; Perez-Torrado F.J.; Rodriguez-Gonzalez, A.; Gasperini D.
Issue Date21-Jun-2009
AbstractNew evidences on the Plio-Quaternary volcanism in Gran Canaria (4 Ma to recent) [1] have provided a complete framework of petrographic, chemical, isotopic and thermobarometric data that allows to reinterpret the recent evolution of this island. In this work, bulk rock and mineral chemistry have been used to define P-T paths of the ascending magmas based on clinopyroxene (cpx)-melt thermobarometric calculations following the model of Putirka et al. [2]. Plio-Quaternary pristine melts separated at mantle dephts (P~13 kbar and T~1250 ºC) and then rised towards the surface by early adiabatic ascent. Above the MOHO (located at ca. 15 km depth), a first group of magmas continued rising by the same P-T ratios but with a shift towards lower T (~1150ºC). This is interpreted as the effect of intrusion in the colder fragile oceanic crust. Instead, a second group of magmas stagnated close to the mantle-crust discontinuity (P~4 to 6 kbar; 12 to 20 km depth). Most of the ponded pristine magmas are characterized by the presence of reverse zoned cpxs, with green cores of salitic composition surrounded by brown rims classified as diopsides. Petrographic and chemical features of such reverse zoned cpxs favour a xenocrystic origin of the green cores, likely related to magma mixing or mingling processes. Subsequent uprising of this second group of magmas through the crust was not continous but occurred in a spread way.
Appears in Collections:(Geo3Bcn) Comunicaciones congresos
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