Spherulite crystallization induces Fe-redox redistribution in silicic melt

• Published in: Chemical Geology
• Main Authors: Castro, Jonathan M., Cottrell, Elizabeth, Tuffen, H., Logan, Amelia V., Kelley, Katherine A.
• Other Authors: Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Department of Mineral Sciences Washington, Smithsonian Institution, Department of Environmental Science Lancaster, Lancaster University, Graduate School of Oceanography Narragansett, University of Rhode Island (URI)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2009
• Subjects: Obsidian; Spherulite; Oxidation–reduction; FTIR; XANES; [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology; [SDE.MCG]Environmental Sciences/Global Changes; Krafla; Iceland
• Online Access: https://insu.hal.science/insu-00442797; https://insu.hal.science/insu-00442797/document; https://insu.hal.science/insu-00442797/file/Castro-ChemicalGeology-2009.pdf; https://doi.org/10.1016/j.chemgeo.2009.09.006

International audience Rhyolitic obsidians from Krafla volcano, Iceland, record the interaction between mobile hydrous species liberated during crystal growth and the reduction of ferric iron in the silicate melt. We performed synchrotron µ-FTIR and µ-XANES measurements along a transect extending fr...