Thermal effects of metamorphic fluids in subduction zones

Research Article| November 01, 1987 Thermal effects of metamorphic fluids in subduction zones Simon M. Peacock Simon M. Peacock 1Department of Geology, Arizona State University, Tempe, Arizona 85287 Search for other works by this author on: GSW Google Scholar Geology (1987) 15 (11): 1057–1060. https://doi.org/10.1130/0091-7613(1987)15<1057:TEOMFI>2.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Simon M. Peacock; Thermal effects of metamorphic fluids in subduction zones. Geology 1987;; 15 (11): 1057–1060. doi: https://doi.org/10.1130/0091-7613(1987)15<1057:TEOMFI>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract In subduction zones, large volumes of fluid are released from the subducting slab during prograde metamorphism of hydrated oceanic crust. Once released, metamorphic fluids tend to migrate upward owing to buoyancy. Fluid migration can affect the thermal structure of a subduction zone by (1) advecting heat and (2) causing retrograde (hydration, carbonation) reactions in the hanging wall. Under most P-T conditions, the volumetric heat capacities of H2O and rocks are similar; therefore, the thermal effects of fluid migration and uplift are comparable. Calculations suggest that advective heat transport by fluid flow causes relatively minor thermal effects. Pervasive upward fluid flow results in thermal effects analogous to regional uplift rates on the order of 0.2 mm/yr. Fluid flow channelized along the subduction shear zone translates the local thermal structure of the shear zone updip at ∼1 mm/yr. A more important thermal effect results from exothermic retrograde reactions in the hanging wall that release ∼30 kJ/mol of H2O consumed. Retrograde reactions significantly retard cooling of the hanging wall just as prograde reactions retard warming of the subducting slab. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.