High CO2 solubilities in mantle magmas

Research Article| January 01, 1976 High CO2 solubilities in mantle magmas Peter J. Wyllie; Peter J. Wyllie 1Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637 Search for other works by this author on: GSW Google Scholar W. L. Huang W. L. Huang 2Department of Geology, National Taiwan University, Taipei, Taiwan, R.O.C Search for other works by this author on: GSW Google Scholar Author and Article Information Peter J. Wyllie 1Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637 W. L. Huang 2Department of Geology, National Taiwan University, Taipei, Taiwan, R.O.C Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1976) 4 (1): 21–24. https://doi.org/10.1130/0091-7613(1976)4<21:HCSIMM>2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Peter J. Wyllie, W. L. Huang; High CO2 solubilities in mantle magmas. Geology 1976;; 4 (1): 21–24. doi: https://doi.org/10.1130/0091-7613(1976)4<21:HCSIMM>2.0.CO;2 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 SocietyGeology Search Advanced Search Abstract Phase diagrams for the assemblage forsterite+enstatite+CO2 in MgO-SiO2-CO2 show that a subsolidus carbonation reaction intersects the solidus near 44 kb–1530°C and stabilizes the carbonate molecule in the liquid, causing CO2 solubility to increase from about 5 to 10 wt percent to about 40 wt percent. A similar increase occurs in the system CaO-MgO-SiO2-CO2 near 25 kb–1200°C for the liquid coexisting with forsterite+orthopyroxene+ clinopyroxene. The CO2 solubility in diopside and enstatite liquids remains relatively low, because these are not involved in carbonation reactions at this pressure. This accounts for contrasted CO2 solubilities in silicate melts reported in recent experimental studies. Magmas generated in a CO2-bearing mantle below a depth of 80 km may contain up to 40 wt percent dissolved CO2. CO2-rich, SiO2-undersaturated magmas can coexist with mantle peridotite through a wide temperature range. These could represent either primary carbonatite and kimberlite magmas or the carbonated alkali ultrabasic magmas cited by many petrologists as parents for the derivation of continental volcanic and plutonic associations of highly alkalic rocks. 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.