VOLCANO: Goldschmidt 2015. 19e: Drilling in Oceanic Arcs

[Chelsea Allison <cmalliso@xxxxxxx>]

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Goldschmidt 2015. 19e: Drilling in Oceanic Arcs

From: Yoshihiko Tamura <tamuray@xxxxxxxxxxxxx>
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Dear all,

I'd like to remind you the session we proposed from oceanic arcs. Although the first word of our session is 'drilling', any topics about geodynamic and petrological evolution of oceanic arcs are welcomed. 

The deadline for abstract submission is April 2nd, 2015: http://goldschmidt.info/2015/abstracts

Best regards,

Yoshi

19e: Drilling in Oceanic Arcs, the Birth Place of the Continental Crust and of Metallogenic Diversity at Oceanic Plate Boundaries

Convenors: Yoshihiko Tamura, Cornel E. J. de Ronde, Mark Hannington, Jun-ichiro Ishibashi, Kaj Hoernle
Keynote: Simon Turner 

Intuitively thick crust is necessary to produce andesitic magmas and continental crust if AFC (assimilation-fractional crystallization) plays an important role in the differentiation from mantle-derived (primary) basaltic magmas to andesites. However, seismic velocity images and andesite eruptions of the Izu-Bonin Mariana (IBM) oceanic arc suggests that juvenile components of continental crust may be produced in oceanic arcs. Andesitic crust is also produced in the Lau back-arc spreading systems at greater rates than in the volcanic arc itself with seismic crustal structure that mirrors some aspects of andesitic arcs. This has important implications for the metallogenic diversity of seafloor magmatic-hydrothermal systems in arc settings and their eventual inheritance by continental crust. Preliminary results from the three recent IODP Expeditions (Expeditions 350, 351 and 352) investigating the northern IBM subduction system during 2014 are welcome, as are new findings on the geodynamic and petrogenetic evolution of the Tonga-Kermadec system.

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