Goldschmidt 2014. New Advances in Subduction Zone Magma Genesis
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Please consider submitting an abstract to Goldschmidt 2014 session 7b. Novel ideas and approaches to subduction magmatism and volcanism are particularly welcome. The Goldschmidt 2014 conference will be held in Sacramento, CA from 8 to 13 June.
Abstracts are due on 8 Feb 2014
07b: New Advances in Subduction Zone Magma Genesis
Magmatism at the Earth's dynamic subduction zones generates volatile-rich, andesitic magmas that resemble continental crust in composition and form an integral part of the broader geochemical cycles on Earth. The plate tectonic concept brought the recognition that andesite genesis is causally linked to slab subduction and major strides have been made in the past decades towards understanding subduction cycling. However, it remains unclear the extent recycled slab materials (subducted trench sediment, igneous oceanic crust, serpentinitized mantle, and eroded crust) affect the major and trace element chemistry of primary arc melts. How much slab material is contained in primary arc magmas? Are primary arc magmas basaltic or silicic or both? How are slab materials principally transferred to the mantle (fluids? silicic melts? mélange diapirs?). Do these components react and hybridize with the subarc mantle, or rather pass through it? What is the role of the overlying crust in modifying melt compositions? What are the timescales of slab material transfer through mantle and crust? This session seeks new concepts of material processing at convergent margin that challenge the classical model of basaltic arc magma formation from subarc mantle with only minor mass contributions from the subducted slab. Case studies and conceptual approaches from all disciplines are welcome, including field studies, experimental petrology and geophysical approaches ranging from fluid dynamics to seismology. Contributions that address the quantification of mass transfer from slab to arc are particularly encouraged.
Keynote speaker: Arturo Gomez-Tuena (on slab
diapirism and
more)
Invited Speaker: Fang Huang
convenors: Susanne M. Straub, Heather Handley, Marc-Antoine Longpre
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