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Quantitative mineralogy for facies definition in the Marcellus Shale (Appalachian Basin, USA) using XRD-XRF integration

Hupp, Brittany N ; Donovan, Joseph J

Sedimentary Geology, September 2018, Vol.371, pp.16-31 [Peer Reviewed Journal]

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  • Title:
    Quantitative mineralogy for facies definition in the Marcellus Shale (Appalachian Basin, USA) using XRD-XRF integration
  • Author: Hupp, Brittany N ; Donovan, Joseph J
  • Description: Determining the mineralogy of mature sedimentary rocks, particularly mudrock, often defaults to qualitative or semi-quantitative methods due to difficulties in correctly quantifying multiple unknown mineral phases. Constraining mineral abundances is particularly difficult in shale due to preferred mounting orientation of common phyllosilicate phases, commonly leading to overestimation of clay minerals and mica. We introduce a quantitative approach to constraining mineralogy within mudrock by integrating x-ray diffraction (XRD) and x-ray fluorescence (XRF) data sets collected on splits of the same samples. The technique involves partitioning XRF cation concentrations into XRD-identified silicate, carbonate, and sulfide phases, then estimating quartz by XRF SiO2 balance. This method is applied to an example dataset from the economically significant Marcellus Shale (Middle Devonian, Appalachian Basin, USA). Conventional reference-intensity ratio (RIR) interpretation identified nine...
  • Is Part Of: Sedimentary Geology, September 2018, Vol.371, pp.16-31
  • Identifier: ISSN: 0037-0738 ; E-ISSN: 1879-0968 ; DOI: 10.1016/j.sedgeo.2018.04.007
  • Subjects: Clay Minerals ; Marcellus Shale ; Mineralogy ; Mudrock ; X-Ray Diffraction ; X-Ray Fluorescence ; Clay Minerals ; Marcellus Shale ; Mineralogy ; Mudrock ; X-Ray Diffraction ; X-Ray Fluorescence ; Geology
  • Language: English

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