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    Direct dating Paleo-fluid flow events in sedimentary basins

    Access Status
    Fulltext not available
    Authors
    Yang, P.
    Liu, K.
    Li, Zhen
    Rankenburg, Kai
    McInnes, Brent I.A.
    Liu, J.
    Evans, Noreen
    Date
    2022
    Type
    Journal Article
    
    Metadata
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    Citation
    Yang, P. and Liu, K. and Li, Z. and Rankenburg, K. and McInnes, B.I.A. and Liu, J. and Evans, N.J. 2022. Direct dating Paleo-fluid flow events in sedimentary basins. Chemical Geology. 588: ARTN 120642.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2021.120642
    ISSN
    0009-2541
    Faculty
    Faculty of Science and Engineering
    School
    John de Laeter Centre (JdLC)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LE150100013
    URI
    http://hdl.handle.net/20.500.11937/95553
    Collection
    • Curtin Research Publications
    Abstract

    Reconstructing fluid evolution history in old sedimentary basins is extremely challenging due to the prolonged evolution, lack of exact age constraints and absence of preserved fluids. By integrating in-situ calcite U–Pb dating, fluid inclusion analysis, measurements of major and trace elements and carbon‑oxygen‑strontium isotopes, and molecular composition analysis of petroleum, we have reconstructed the fluid evolution history during the Carboniferous in an Ordovician deeply-buried carbonate reservoir in the Tarim Basin, China, with unprecedented temporal resolution. Five generations of calcite cementation spanning over 37 m.y. are dated in a single calcite vein with U–Pb ages ranging from ~353 Ma to ~316 Ma. The initial cement was associated with an intrusion of hyper-saline brine, enriched in REEs. This was followed by influx of meteoric water to precipitate the second and third generations of cement, which are characterized by reduced salinity, anomalously high 87Sr/86Sr ratios and extremely low concentration of REEs. The fourth generation of calcite cement was formed in a deep-fluid system accompanied by oil charge as indicated by the presence of bitumen, oil inclusions and low δ13C and 87Sr/86Sr ratios. The fifth generation of cement was precipitated from equilibrated connate water, and has the lowest salinity and a comparable REE signature to the host rock. Oil charge event occurred around 326 Ma. This study demonstrates the effectiveness of combining in-situ calcite U–Pb geochronology, fluid inclusion analysis, elemental and isotopic geochemistry to elucidate high-resolution temporal fluid evolution in old sedimentary basins with a complex tectonic history, providing a new paradigm for studying geofluid evolution.

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