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    Nebula sulfidation and evidence for migration of "free-floating" refractory metal nuggets revealed by atom probe microscopy

    Access Status
    Fulltext not available
    Authors
    Daly, L.
    Bland, Phil
    Saxey, David
    Reddy, Steven
    Fougerouse, Denis
    Rickard, William
    Forman, Lucy
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Daly, L. and Bland, P. and Saxey, D. and Reddy, S. and Fougerouse, D. and Rickard, W. and Forman, L. 2017. Nebula sulfidation and evidence for migration of "free-floating" refractory metal nuggets revealed by atom probe microscopy. Geology. 45 (9): pp. 847-850.
    Source Title
    Geology
    DOI
    10.1130/G39075.1
    ISSN
    0091-7613
    School
    John de Laeter Centre
    URI
    http://hdl.handle.net/20.500.11937/56891
    Collection
    • Curtin Research Publications
    Abstract

    Disk models have been proposed that imply particles migrate rapidly in a protoplanetary disk. However, the only physical constraints on these processes from meteorites are observations of refractory inclusions in cometary material from the NASA Stardust mission. Atom probe microscopy (APM) of sub-micrometer refractory metal nuggets (RMNs) contained within a Sc-Zr-rich ultrarefractory inclusion (URI) from the ALH 77307 carbonaceous Ornans (CO) 3.0 meteorite revealed the presence of sulfur at 0.06-1.00 atomic percent (at%) abundances within RMNs. The mineralogical assemblage, petrographic texture, and flat chondrite-normalized highly siderophile element ratios indicate S exposure was unlikely to have occurred after the RMNs were incorporated into the URI. APM analyses suggest these RMNs were likely "free floating" when they were exposed to a S-condensing gas. This requires early, rapid migrat ion of RMNs to cooler regions of the disk to incorporate S and then cycling back to the Ca-Al-rich inclusion (CAI)-forming region for incorporation in the URI, or conditions in the CAI-forming region that promote the incorporation of S into RMNs.

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