Oxygen isotopes and the early Solar System

Abstract

Restricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Franchi I. A., Baker L., Bridges J. C., Wright I. P. and Pillinger C. T. 2001Oxygen isotopes and the early Solar SystemPhil. Trans. R. Soc. A.3592019–2035http://doi.org/10.1098/rsta.2001.0894SectionRestricted accessOxygen isotopes and the early Solar System I. A. Franchi I. A. Franchi Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author , L. Baker L. Baker Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author , J. C. Bridges J. C. Bridges Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK Google Scholar Find this author on PubMed Search for more papers by this author , I. P. Wright I. P. Wright Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author and C. T. Pillinger C. T. Pillinger Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author I. A. Franchi I. A. Franchi Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author , L. Baker L. Baker Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author , J. C. Bridges J. C. Bridges Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK Google Scholar Find this author on PubMed Search for more papers by this author , I. P. Wright I. P. Wright Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author and C. T. Pillinger C. T. Pillinger Planetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK Google Scholar Find this author on PubMed Search for more papers by this author Published:15 October 2001https://doi.org/10.1098/rsta.2001.0894AbstractMeteorites preserve a wide range of oxygen isotopic signatures from the time of the Solar System's formation. Most of these rocks record complex histories, each phase of which has the potential for overwriting initial oxygen signatures. The unequilibrated ordinary chondrites reveal evidence of hydrothermal alteration through isotopic disequilibrium within chondrules and in secondary magnetites, which we can now constrain to temperatures of 140–180°C. The effects of this alteration are progressively obliterated by later thermal metamorphism. Further heating leads to melting (shown in achondritic meteorites), producing well–defined mass–fractionation lines using high–precision analyses.The oxygen from low–temperature minerals in carbonaceous chondrites reveals high levels of isotopic uniformity, suggesting that the aqueous alteration occurred under open–system conditions. The initial isotopic composition of the water from the ordinary chondrites is quite distinct from that in the carbonaceous chondrites, but both fall on a single line of slope 1.0, as do the initial anhydrous silicate compositions. This is taken to show that a process generating a mass–independent fractionation was responsible for most of the oxygen–isotopic variation seen in meteorites. Subsequent aqueous alteration of the meteorite parent bodies involving these components is then capable of producing the full observed variation. 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Hutchison R, Pillinger C, Turner G, Russell S and Cassen P (2001) Unresolved questions regarding the origins of Solar System solids, Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 359:1787, (1935-1947), Online publication date: 15-Oct-2001. This Issue15 October 2001Volume 359Issue 1787Discussion Meeting Issue ‘Origin and early evolution of solid matter in the Solar System’ organized by Robert Hutchison, Colin Pillinger, Grenville Turner and Sara Russell Article InformationDOI:https://doi.org/10.1098/rsta.2001.0894Published by:Royal SocietyPrint ISSN:1364-503XOnline ISSN:1471-2962History: Published online15/10/2001Published in print15/10/2001 License: Citations and impact Keywordsmeteoriteschondritesoxygen isotopesmass–independent fractionationhydrothermal alteration