Clumped isotope evidence for episodic, rapid flow of fluids in a mineralized fault system in the Peak District, UK

Dennis, Paul Frederick, Myhill, Daniel J, Marca, Alina D and Kirk, Ruth (2018) Clumped isotope evidence for episodic, rapid flow of fluids in a mineralized fault system in the Peak District, UK. Journal of the Geological Society. ISSN 0016-7649

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    Abstract

    We have used clumped isotope thermometry to study a fault-hosted hydrothermal calcite vein associated with the Mississippi Valley Type (MVT) mineralization on the Derbyshire Platform in the southern Pennines, UK. This is the first published data set obtained using a new mass spectrometer, MIRA, optimized for clumped isotope analysis and an associat-ed clumped isotope-temperature calibration. We analysed multiple generations of vein growth at high spatial resolution in two transects across the vein. The vein grew episodi-cally at temperatures between 40° and 100°C. We interpret each episode of growth as being associated with an increasing flux of formation waters from deep sedimentary basins next to the mineralized platform and an accompanying increase in the precipitation temperatures. Heat is conserved in the fluid as it ascends along the fault surface and, thus, flow must have been fast and restricted to short-lived pulses. The flux could have been driven by high pore pressures associated with rapid sedimentation, hydrocarbon genera-tion and diagenesis in the basinal facies of the Visean Bowland-Hodder group. Natural hydraulic fracturing of shale units and failure of capillary seals, possibly triggered by uplift, allowed the release of fluids into aquifers within the sediment pile.

    Item Type: Article
    Faculty \ School: Faculty of Science > School of Environmental Sciences
    Depositing User: LivePure Connector
    Date Deposited: 05 Nov 2018 12:30
    Last Modified: 15 Dec 2018 01:03
    URI: https://ueaeprints.uea.ac.uk/id/eprint/68768
    DOI: 10.1144/jgs2016-117

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