Magmatic evolution of a volcano studied by 230 Th- 238 U disequilibrium and trace elements systematics: The Etna case

Details Magmatic evolution of a volcano studied by 230 Th- 238 U disequilibrium and trace elements systematics: The Etna case Magmatic evolution of a volcano studied by 230 Th- 238 U disequilibrium and trace elements systematics: The Etna case

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1397c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 8, pp.1397-1416

Computer Science

25

Scientific paper

Age determinations of several lava flows from Etna through 230 Th- 238 U disequilibrium (internal isochrons) yield a precise chronology of the volcano's history for the last 200,000 years, and emphasize the main episodes in the formation of this huge complex strato-volcano. Study of ( 230 Th / 232 Th ) 0 initial ratios of lavas together with their trace-element compositions yields a consistent model of magmatic evolution implying the existence, for 200,000 years, of a deep reservoir of alkalic magma periodically mixed with magmas of tholeiitic affinity. These short periods of mixing appear to be related to the formation of the large calderas of Etna. In addition to these processes affecting the deep reservoir, fractional crystallization also occurred in more superficial levels of the volcanic edifice, thereby yielding several series of differentiation of relatively short duration. As for its geochemistry, Etna's volcanism is of oceanic type but with its own characteristics and in a peculiar geodynamic context, at the edge of the African Plate.

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