Goldschmidt Conference, September 2003

S37 -- HP to UHP Metamorphic Mass Transfer and Chemical Cycling in Convergent Margins

Devolatilization and fluid mobility in convergent margins are recorded in high-pressure (HP) and ultrahigh-pressure (UHP) metamorphic suites, and "fluids" (H₂O-rich COHSN fluids, silicate melts) play key roles in subduction-zone chemical cycling. Many models for subduction-zone recycling, particularly those of arc magmatism, assume liberation and large-scale transfer of H₂O-rich fluids, in some cases also silicate melts. Physical properties of these "fluids" remain unknown, and evidence for high-pressure "supercriticality" argues for continuous miscibility between H2O-rich fluids and hydrou melts. High-pressure solubilities of many major mineral phases remain uncertain, as does H₂O activity critical in dehydration/hydration reactions.

This session, co-sponsored by GERM and MARGINS Subduction Factory, will focus on:

1. devolatilization of subducting oceanic and continental crust;
2. HP/UHP "fluids" flow and metasomatism;
3. solubility, element/isotope partitioning and transport properties of the "fluids"; and
4. arc magma (and forearc) geochemical records of HP and UHP slab- and sediment-derived "fluids".

Chairs

Yong-Fei Zheng
University of Science and Technology of China
China

Gray E. Bebout
Lehigh University
USA

Pascal Philippot
Institut de Physique du Globe de Paris
France

Keynote Speakers

C. Manning
University of California, Los Angeles
USA

B. Fu
James Cook University
Australia

V. Busigny
Institut de Physique du Globe de Paris
France

 

 

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