Ca isotopes and the rainfall limit of silicate weathering on Earth

Ca isotopes and the rainfall limit of silicate weathering on Earth S.A. EWING*, R. AMUNDSON, B.W. STEWART, M. THIEMENS AND D.J. DEPAOLO 1 Center for Isotope Geochemistry, UC Berkeley (*correspondence: saewing@nature.berkeley.edu) (depaolo@eps.berkeley.edu) Division of Ecosystem Sciences, UC Berkeley (earthy@nature.berkeley.edu) Department of Geology and Planetary Sciences, University of Pittsburgh (bstewart@pitt.edu) Department of Chemistry and Biochemistry, UC San Diego (mthiemens@ucsd.edu)