Aragonite in olivine from Calatrava, Spain—Evidence for mantle carbonatite melts from >100 km depth

Abstract

Research Article| October 01, 2010 Aragonite in olivine from Calatrava, Spain—Evidence for mantle carbonatite melts from >100 km depth Emma R. Humphreys; Emma R. Humphreys 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol BS8 1RJ, UK2Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK Search for other works by this author on: GSW Google Scholar Ken Bailey; Ken Bailey 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol BS8 1RJ, UK Search for other works by this author on: GSW Google Scholar Chris J. Hawkesworth; Chris J. Hawkesworth 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol BS8 1RJ, UK3University of St Andrews, College Gate, North Street, St Andrews, Fife KY16 9AJ, UK Search for other works by this author on: GSW Google Scholar Frances Wall; Frances Wall 2Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK4Camborne School of Mines, University of Exeter, Cornwall Campus, Penryn, Cornwall TR10 9EZ, UK Search for other works by this author on: GSW Google Scholar Jens Najorka; Jens Najorka 2Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK Search for other works by this author on: GSW Google Scholar Andrew H. Rankin Andrew H. Rankin 5School of Geography, Geology and the Environment, Kingston University, Surrey KT1 2EE, UK Search for other works by this author on: GSW Google Scholar Geology (2010) 38 (10): 911–914. https://doi.org/10.1130/G31199.1 Article history received: 09 Mar 2010 rev-recd: 07 May 2010 accepted: 20 May 2010 first online: 09 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 Emma R. Humphreys, Ken Bailey, Chris J. Hawkesworth, Frances Wall, Jens Najorka, Andrew H. Rankin; Aragonite in olivine from Calatrava, Spain—Evidence for mantle carbonatite melts from >100 km depth. Geology 2010;; 38 (10): 911–914. doi: https://doi.org/10.1130/G31199.1 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 Aragonite, as an inclusion in olivine from a leucitite lava flow, provides evidence for high-pressure crystallization and carbonatitic activity beneath the geophysical lithosphere in Calatrava, Spain. The aragonite occurs as a single crystal within olivine (Fo87), interpreted to have crystallized from a carbonated silicate melt at mantle depths. Experimental data constrain the stability of aragonite to depths of >100 km at CO2-H2O-bearing mantle solidus temperatures. This is the first documented evidence of magmatic aragonite crystallized in the mantle. Entrained as xenocrysts, the olivines have not crystallized from the carrier melts, which must have formed deeper within the mantle. Lead isotope data of the leucitite and carbonate inclusions indicate that the source melts show isotopic enrichment relative to mid-oceanic ridge basalt and most ocean island basalt. Our evidence strengthens the argument for direct and deep mantle-derived volcanic carbonatite in alkaline volcanic provinces containing maar-type volcanism, such as Calatrava. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.