An empirical model for the solubility of H2O in magmas to 3 kilobars

Abstract

Other| February 01, 1998 An empirical model for the solubility of H 2 O in magmas to 3 kilobars Gordon Moore; Gordon Moore University of California, Department of Geology and Geophysics, Berkeley, CA, United States Search for other works by this author on: GSW Google Scholar Torsten Vennemann; Torsten Vennemann Search for other works by this author on: GSW Google Scholar I. S. E. Carmichael I. S. E. Carmichael Search for other works by this author on: GSW Google Scholar Author and Article Information Gordon Moore University of California, Department of Geology and Geophysics, Berkeley, CA, United States Torsten Vennemann I. S. E. Carmichael Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online Issn: 1945-3027 Print Issn: 0003-004X GeoRef, Copyright 2004, American Geological Institute. American Mineralogist (1998) 83 (1-2): 36–42. https://doi.org/10.2138/am-1998-1-203 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gordon Moore, Torsten Vennemann, I. S. E. Carmichael; An empirical model for the solubility of H 2 O in magmas to 3 kilobars. American Mineralogist 1998;; 83 (1-2): 36–42. doi: https://doi.org/10.2138/am-1998-1-203 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 SocietyAmerican Mineralogist Search Advanced Search Abstract We present 16 new manometric determinations of H 2 O solubility for a range of natural silicate liquid compositions equilibrated up to 3 kbar of H 2 O pressure. As the threshold temperature of dehydration of the quenched glasses during measurements of the H 2 O content becomes lower as a function both of bulk silicate composition and the dissolved H 2 O content, we measured the H 2 O released on heating over a range of temperature intervals. For example, alkali-rich samples having a dissolved H 2 O content greater than approximately 6 wt% start to evolve H 2 O at temperatures less than 150 degrees C, whereas more mafic samples and silicic samples with less than 6 wt% H 2 O begin to dehydrate at temperatures greater than 200 degrees C. This behavior is consistent with the concept that alkali-rich liquids can have their glass transition temperatures lowered substantially by dissolved H 2 O and that H 2 O is released only significantly on heating in the supercooled liquid region, rather than in the glass region. Using these new data, in conjunction with previous data from the literature, we refined and extended the empirical H 2 O solubility model of Moore et al. (1995b). The new model works well (2sigma = + or -0.5 wt%) between 700-1200 degrees C and 1-3000 bar and can be applied to any natural silicate liquid in that range. The model may also be used for systems where X H2O <1 in the vapor phase. 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.