The abstract submission and registration pages for Goldschmidt 2014 are now all live. Abstract submission will remain open until February 8th (23:59 UTC) and early registration will end on April 8th.
Abstract submission and directions are available at http://goldschmidt.info/2014/abstractsInfo
• Session 5b: Magma Generation/Evolution and Oceanic Crust Formation at Mid-Ocean Ridges and Interoceanic Arcs
• Session 7b: New Advances in Subduction Zone Magma Genesis
See below for more details.
05b: Magma Generation/Evolution and Oceanic Crust Formation at Mid-Ocean Ridges and Interoceanic Arcs
Magmatism in the ocean basins is responsible for forming the igneous crust of two-thirds of Earth’s surface and for a significant portion of mass and heat transfer from the mantle into the oceanic crust and oceans. Petrologic, geochemical, geochronological and geophysical studies of oceanic magmas at a range of spatial and temporal scales (from single eruptions to volcano-scale sampling) in both extrusive and intrusive sections (e.g., by drilling and in ophiolites) have revealed the operation of a wide range of magmatic processes. This session will investigate the latest results to inform our understanding of how the full range of these processes and conditions act to control oceanic magmatism at spreading centers and arcs (including mantle melting style and depth, mantle fluids and metasomatism, melt-rock reactions in the mantle and crust, and eruption of magmas or entrapment as plutons). The session welcomes contributions from petrological, geochemical, geochronological, geophysical, experimental and modeling studies of igneous processes and oceanic crust formation in modern and ancient oceanic settings.
Keynote speaker: Sensumu Umino
Invited Speakers: Dorsey Wanless (and others pending their acceptance).
Convenors: Ken Rubin, Laurence Coogan, Yaoling Niu
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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