King et al. (2007) Boron and lead isotope signatures of subduction-zone mélange formation: Hybridization and fractionation along the slab-mantle interface beneath volcanic arcs, Chemical Geology, 239, 305-322, doi:10.1016/j.chemgeo.2007.01.009. < 20100403101828030.admin > pub
  • abstract:

    The B and Pb isotope systems are widely applied tracers of recycling processes occurring during subduction. Studies examining these complementary systems as a pair enjoy considerable success, where B primarily records the thermal and fluid evolution of the subducting slab, whereas the tripartite Pb system constrains the source of subducted material returned to volcanic arcs. However, interpretations derived from the arc volcanic record critically depend upon assumptions regarding compositions of unmetamorphosed inputs to subduction zones. Few studies have directly addressed potential fractionation of B isotopes and U–Th–Pb by analysis of high-pressure (HP) and ultrahigh-pressure (UHP) metamorphic suites, despite that fractionation in these systems during subduction-zone metamorphism has been inferred in many studies of volcanic arcs and ocean–island basalts. Here, we address the metamorphic evolution of subducted material with B and Pb isotope determinations for the mélange matrix of the Catalina Schist, CA.

  • doi: 10.1016/j.chemgeo.2007.01.009
  • modified at 2020-04-15
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  • name
  • King, Robert L.
  • Bebout, Gray E.
  • Grove, Marty
  • Moriguti, Takuya
  • Nakamura, Eizo