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Hinterland environments of the Late Jurassic northern Weald Basin, England

Barshep, Dinfa Vincent ; Worden, Richard Henry

Geological journal (Chichester, England), 2023-07, Vol.58 (7), p.2555-2577 [Periódico revisado por pares]

Hoboken, USA: John Wiley & Sons, Inc

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  • Título:
    Hinterland environments of the Late Jurassic northern Weald Basin, England
  • Autor: Barshep, Dinfa Vincent ; Worden, Richard Henry
  • Assuntos: Basins ; Corallian sandstones ; Diagenesis ; Distribution patterns ; Fluorescence ; Geochemistry ; Heavy minerals ; Jurassic ; Minerals ; Orogeny ; Outcrops ; palaeoclimate ; palaeogeology ; Petrography ; Petrology ; provenance ; Sandstone ; sandstone geochemistry ; Sediment distribution ; Sedimentology ; Upper Oxfordian ; Weald Basin ; Weathering
  • É parte de: Geological journal (Chichester, England), 2023-07, Vol.58 (7), p.2555-2577
  • Descrição: Reconstructing provenance in sandstones can be challenging, especially when the hinterland palaeogeology is unknown due to burial, diagenesis or weathering of the original outcrops. As sedimentary processes alter the distribution of minerals in the depositional environment, the use of multiple provenance methods reduces uncertainties, because, together, they can account for depositionally‐controlled textural and mineralogical re‐distribution in a basin. Here, we have applied petrography, X‐ray fluorescence geochemistry and sedimentology to understand the provenance of shallow marine Corallian sandstones with the aim of deducing the palaeogeology, palaeoenvironment and sediment distribution within the northern parts of the Upper Jurassic Weald Basin, onshore UK. The Corallian sandstones had a mixed mafic‐felsic (intermediate), metasedimentary recycled orogen source. The hinterland experienced significant physical and chemical weathering under humid conditions. Corallian sandstones were relatively more chemically mature up‐dip and more texturally mature down‐dip. Chemically unstable grains and heavy minerals were relatively concentrated down‐dip. Heterogeneous, sedimentologically‐controlled mineral distribution patterns highlight potential errors which may be made in deriving source‐area maturity. This study is significant as it illustrates the combined roles of provenance and deposition in controlling primary mineral distribution that then influenced the style of burial diagenesis. The work presented here emphasizes the importance of a multi‐proxy approach to improve provenance analysis. This study reports detrital mineralogy, geochemical analysis and sedimentological data for the Corallian sandstones of the Weald Basin. The data reveal a mixed mafic‐felsic provenance in a warm humid climate for the Corallian sandstones. The study also reveals intense sediment modification and redistribution by hydrologic sorting and highlights the importance of sedimentological and geochemical analysis in provenance studies.
  • Editor: Hoboken, USA: John Wiley & Sons, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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