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    Dating deposition and low-grade metamorphism by in situ U-Pb geochronology of titanite in the Paleoproterozoic Timeball Hill Formation, southern Africa

    Access Status
    Fulltext not available
    Authors
    Rasmussen, Birger
    Fletcher, Ian
    Muhling, J.
    Date
    2013
    Type
    Journal Article
    
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    Citation
    Rasmussen, Birger and Fletcher, Ian R. and Muhling, Janet R. 2013. Dating deposition and low-grade metamorphism by in situ U-Pb geochronology of titanite in the Paleoproterozoic Timeball Hill Formation, southern Africa. Chemical Geology. 351: pp. 29-39.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2013.04.015
    ISSN
    0009-2541
    URI
    http://hdl.handle.net/20.500.11937/22987
    Collection
    • Curtin Research Publications
    Abstract

    Titanite coexists with zircon in a felsic tuff in the Paleoproterozoic Timeball Hill Formation, southern Africa. Two generations of titanite are preserved: euhedral, brown crystals with apatite inclusions, and colorless, matrix-filling cement. The brown titanite has elevated U, Th and Fe, and low Al, consistent with a magmatic origin, whereas the colorless titanite has higher Al and F contents, suggestive of a metamorphic paragenesis. In situ SHRIMP geochronology of zircons extracted from a polished thin section of the tuff bed suffer from inheritance and Pb--loss and yield an imprecise date (2259 ± 35 Ma), whereas coexisting brown titanites give a weighted mean 207Pb/206Pb age of 2278 ± 7 Ma. This date is consistent with U--Pb zircon ages for tuffs in the same stratigraphic unit from a nearby drill-hole. The brown titanite is interpreted to be magmatic and to provide a reliable estimate for the age of deposition. In situ U--Pb dating of matrix-filling titanite cement from the same stratigraphic interval yields an age of 2145 ± 12 Ma, which corresponds with previous estimates for a low-grade tectonothermal event in southern Africa. Our results demonstrate that titanite is a versatile chronometer that can be used to constrain depositional ages, and those of low-grade metamorphism, thus increasing the number of sedimentary rocks that can be dated and elucidating the low-temperature geological history of depositional basins.

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