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    Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235

    155577_155577.pdf (5.796Mb)
    Access Status
    Open access
    Authors
    Grange, Marion
    Nemchin, Alexander
    Timms, Nicholas Eric
    Pidgeon, Robert
    Meyer, C.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Grange, M.L. and Nemchin, A.A. and Timms, N. and Pidgeon, R.T. and Meyer, C. 2011. Complex magmatic and impact history prior to 4.1 Ga recorded in zircon from Apollo 17 South Massif aphanitic breccia 73235. Geochimica et Cosmochimica Acta. 75 (8) : pp. 2213-2232.
    Source Title
    Geochimica et Cosmochimica Acta
    DOI
    10.1016/j.gca.2011.01.036
    ISSN
    00167037
    School
    Department of Applied Geology
    Remarks

    NOTICE: This is the author’s version of a work that was accepted for publication in Geochimica et Cosmochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Geochimica et Cosmochimica Acta [75, 8, 2011] DOI 10.1016/j.gca.2011.01.036

    URI
    http://hdl.handle.net/20.500.11937/2774
    Collection
    • Curtin Research Publications
    Abstract

    Sample 73235 is one of several aphanitic impact melt breccias collected by the Apollo 17 mission at stations 2 and 3 on the slopes of the South Massif. This study presents a detailed investigation of internal structures and U-Pb ages of large zircon grains from this breccia sample. New data combined with the results of previous studies of zircon grains from the same location indicate that most zircon clasts in breccias from stations 2 and 3 formed during multiple magmatic events between 4.37 and 4.31 Ga, although the oldest zircon crystallized at about 4.42 Ga and the youngest at 4.21 Ga. In addition, zircons from the aphanitic breccias record several impact events prior to the 3.9 Ga Late Heavy Bombardment.The results indicate that the zircons probably crystallized at different locations within the Procellarum KREEEP Terrane and were later excavated and modified by several impacts and delivered to the same locality within separate ejecta blankets. This locality became a source of material that formed the aphanitic impact melt breccias of the South Massif during a 3.9 Ga impact. However, the zircons, showing old impact features, are not modified by this 3.9 Ga impact event suggesting that (i) this common source area was located at the periphery of excavation cavity, and (ii) the > 3.9 Ga ages recorded by the zircon grains could date large (basin-forming) events as significant as major later (3.9 Ga) collisions such as Imbrium and Serenitatis.

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