We hope you consider submitting an abstract for the 2015 GSA meeting to Topical Session T169, 

This session invites contributions that seek progress in understanding the extremes of crustal metamorphism and their role in crustal evolution, with particular emphasis on using novel and innovative approaches to overcome difficulties in quantifying aspects of such metamorphism, including, but not limited to: trace element thermometry to retrieve peak temperatures, phase equilibria modeling (accounting for evolving effective bulk compositions, open system behaviour, or chemical potential relationships) to construct P–T paths, linking in situ geochronology with trace element data to quantify timing (petrochronology), and integrating zoned geochronology with geospeedometry to constrain metamorphic duration.