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    Provenance of detrital pyrite in Archean sedimentary rocks: Examples from the Witwatersrand Basin

    Access Status
    Fulltext not available
    Authors
    da Costa, G.
    Hofmann, A.
    Agangi, Andrea
    Date
    2016
    Type
    Book Chapter
    
    Metadata
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    Citation
    da Costa, G. and Hofmann, A. and Agangi, A. 2016. Provenance of detrital pyrite in Archean sedimentary rocks: Examples from the Witwatersrand Basin, in Mazumder, R. (ed), Sediment provenance: influences on compositional change from source to sink, pp. 509-531. Amsterdam, Netherlands: Elsevier.
    Source Title
    Sediment provenance influences on compositional change from source to sink
    DOI
    10.1016/B978-0-12-803386-9.00018-6
    ISBN
    0128033878
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/36531
    Collection
    • Curtin Research Publications
    Abstract

    Detrital pyrite is an accessory mineral in clastic sedimentary rocks deposited prior to c. 2.4 Ga. It is a redox-sensitive mineral and an indicator of low oxygen levels prior to the rise of atmospheric oxygen in the early Paleoproterozoic. Resistance to mechanical abrasion, availability in Archean source rocks, and high density make it a common component of Archean quartz pebble conglomerates, some of which may be gold-bearing. The provenance of pyrite may include sediments and sedimentary rock successions, volcanogenic or sedimentary exhalative massive sulfide deposits, magmatic-hydrothermal deposits, and igneous rocks. The morphology and texture of pyrite grains, the nature of mineral inclusions, trace element geochemistry, and isotopic composition as well as age are the main variables that can be used to evaluate their source. In the Mesoarchean Witwatersrand Basin of South Africa, the world's largest gold deposit, detrital pyrite is mainly derived from sedimentary sources and synsedimentary precipitates.

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