Los Angeles: The most differentiated basaltic martian meteorite

Research Article| November 01, 2000 Los Angeles: The most differentiated basaltic martian meteorite Alan E. Rubin; Alan E. Rubin 1Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA Search for other works by this author on: GSW Google Scholar Paul H. Warren; Paul H. Warren 1Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA Search for other works by this author on: GSW Google Scholar James P. Greenwood; James P. Greenwood 1Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA Search for other works by this author on: GSW Google Scholar Robert S. Verish; Robert S. Verish 2P.O. Box 237, Sunland, California 91040, USA Search for other works by this author on: GSW Google Scholar Laurie A. Leshin; Laurie A. Leshin 3Department of Geology and Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287, USA Search for other works by this author on: GSW Google Scholar Richard L. Hervig; Richard L. Hervig 4Department of Geology and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287, USA Search for other works by this author on: GSW Google Scholar Robert N. Clayton; Robert N. Clayton 5Enrico Fermi Institute, Department of Chemistry and Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, USA Search for other works by this author on: GSW Google Scholar Toshiko K. Mayeda Toshiko K. Mayeda 6Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Alan E. Rubin 1Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA Paul H. Warren 1Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA James P. Greenwood 1Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA Robert S. Verish 2P.O. Box 237, Sunland, California 91040, USA Laurie A. Leshin 3Department of Geology and Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287, USA Richard L. Hervig 4Department of Geology and Center for Solid State Science, Arizona State University, Tempe, Arizona 85287, USA Robert N. Clayton 5Enrico Fermi Institute, Department of Chemistry and Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, USA Toshiko K. Mayeda 6Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA Publisher: Geological Society of America Received: 17 Apr 2000 Revision Received: 17 Jul 2000 Accepted: 17 Aug 2000 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2000) 28 (11): 1011–1014. https://doi.org/10.1130/0091-7613(2000)282.0.CO;2 Article history Received: 17 Apr 2000 Revision Received: 17 Jul 2000 Accepted: 17 Aug 2000 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 Alan E. Rubin, Paul H. Warren, James P. Greenwood, Robert S. Verish, Laurie A. Leshin, Richard L. Hervig, Robert N. Clayton, Toshiko K. Mayeda; Los Angeles: The most differentiated basaltic martian meteorite. Geology 2000;; 28 (11): 1011–1014. doi: https://doi.org/10.1130/0091-7613(2000)282.0.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 Los Angeles is a new martian meteorite that expands the compositional range of basaltic shergottites. Compared to Shergotty, Zagami, QUE94201, and EET79001-B, Los Angeles is more differentiated, with higher concentrations of incompatible elements (e.g., La) and a higher abundance of late-stage phases such as phosphates and K-rich feldspathic glass. The pyroxene crystallization trend starts at compositions more ferroan than in other martian basalts. Trace elements indicate a greater similarity to Shergotty and Zagami than to QUE94201 or EET79001-B, but the Mg/Fe ratio is low even compared to postulated parent melts of Shergotty and Zagami. Pyroxene in Los Angeles has 0.7–4-µm-thick exsolution lamellae, ∼10 times thicker than those in Shergotty and Zagami. Opaque oxide compositions suggest a low equilibration temperature at an oxygen fugacity near the fayalite-magnetite-quartz buffer. Los Angeles cooled more slowly than Shergotty and Zagami. Slow cooling, coupled with the ferroan bulk composition, produced abundant fine-grained intergrowths of fayalite, hedenbergite, and silica, by the breakdown of pyroxferroite. Shock effects in Los Angeles include maskelynitized plagioclase, pyroxene with mosaic extinction, and rare fault zones. One such fault ruptured a previously decomposed zone of pyroxferroite. Although highly differentiated, the bulk composition of Los Angeles is not close to the low-Ca/Si composition of the globally wind-stirred soil of Mars. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.