Minor and trace element partitioning between pyroxene and melt in rapidly cooled chondrules

Abstract

Listen

Translate article

Other| June 01, 1997 Minor and trace element partitioning between pyroxene and melt in rapidly cooled chondrules Rhian H. Jones; Rhian H. Jones University of New Mexico, Department of Earth and Planetary Sciences, Albuquerque, NM, United States Search for other works by this author on: GSW Google Scholar Graham D. Layne Graham D. Layne Woods Hole Oceanographic Institution, United States Search for other works by this author on: GSW Google Scholar Author and Article Information Rhian H. Jones University of New Mexico, Department of Earth and Planetary Sciences, Albuquerque, NM, United States Graham D. Layne Woods Hole Oceanographic Institution, United States Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online Issn: 1945-3027 Print Issn: 0003-004X Copyright © 1981 by the Mineralogical Society of America American Mineralogist (1997) 82 (5-6): 534–545. https://doi.org/10.2138/am-1997-5-613 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 Rhian H. Jones, Graham D. Layne; Minor and trace element partitioning between pyroxene and melt in rapidly cooled chondrules. American Mineralogist 1997;; 82 (5-6): 534–545. doi: https://doi.org/10.2138/am-1997-5-613 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 minor and trace element (REE, Sr, Y, and Zr) data for pyroxenes and mesostases in four porphyritic chondrules from the Semarkona ordinary chondrite. Apparent partition coefficients for clinoenstatite, orthoenstatite, pigeonite, and augite are compared with experimental and petrologic data from the literature, and the effects on apparent partition coefficients of the rapid cooling rates at which chondrules crystallized are evaluated. For most elements, the effects of cooling at rates of hundreds of degrees per hour cannot be distinguished from variations in equilibrium data resulting from differences in temperature or composition. However, for LREE apparent partition coefficients are significantly higher than comparable equilibrium data, and the ratio of HREE/LREE partition coefficients is lower, particularly for Ca-poor pyroxene. We attribute this flattening of REE patterns to the effect of rapid cooling. Apparent partition coefficients of all REE and Y in augite are higher than equilibrium data, particularly in one chondrule with a high Al2O3 content. We suggest that this may be attributed to an increase in the uptake of trivalent trace element cations in the pyroxene crystal structure as a result of charge-balanced substitutions with Al3+ cations. 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.