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claudia-bouman
Team TFS
Team TFS
Silicon isotope systematics of acidic weathering of fresh basalts, Kilauea Volcano, Hawai’i
Steven M. Chemtob (1,2), George R. Rossman (1), Edward D. Young (3), Karen Ziegler (4), Fréderic Moynier (5), John M. Eiler (1), Joel A. Hurowitz (6)
1) Divison of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States, 2) Department of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, United States, 3) Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095, United States, 4) Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131, United States, 5) Institut de Physique du Globe de Paris, Institut Universitaire de France, Université Paris Diderot, Paris, France, 6) Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, United States
Geochimica et Cosmochimica Acta (2015), V169, pp63–81, doi: 10.1016/j.gca.2015.07.026
Silicon stable isotopes are fractionated by a host of low-temperature aqueous processes, making them potentially useful as a weathering proxy. Here we characterize the silicon isotope signature of surficial chemical weathering of glassy basaltic lava flows at Kilauea Volcano, Hawaii. Our results indicate that (1) altering fluid chemistry and fluid–rock ratio impact the Si isotope signature of chemical weathering and (2) δ30Si of solids produced by low temperature aqueous alteration may diverge sharply from watershed- or landscape-scale weathering trends.
  • MC-ICPMS
  • Neptune
  • Si isotopes
  • Weathering
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