Cristin-resultat-ID: 1749375
Sist endret: 2. februar 2020, 19:49
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Composite and diachronous stratigraphic surfaces in low-gradient, transitional settings: The J-3 “unconformity” and the Curtis Formation, east-central Utah, U.S.A.

Bidragsytere:
  • Valentin Zuchuat
  • Ivar Midtkandal
  • Miquel Poyatos More
  • Sigrid Da Costa
  • Hannah Louise Brooks
  • Kristine Halvorsen
  • mfl.

Tidsskrift

Journal of Sedimentary Research
ISSN 1527-1404
e-ISSN 1938-3681
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Volum: 89
Hefte: 11
Sider: 1075 - 1095
Open Access

Importkilder

Scopus-ID: 2-s2.0-85075755978

Beskrivelse Beskrivelse

Tittel

Composite and diachronous stratigraphic surfaces in low-gradient, transitional settings: The J-3 “unconformity” and the Curtis Formation, east-central Utah, U.S.A.

Sammendrag

Unconformities, by definition, correspond to erosional or nondepositional surfaces, which separate older strata below, from younger rocks above, encapsulating significant time gaps. However, recent studies have highlighted the composite nature of some unconformities, as well as their heterochronous and diachronous character, which challenge the use of such a definition in a four-dimensional dynamic environment. The J-3 Unconformity, separating the Middle Jurassic Entrada Sandstone from the Upper Jurassic Curtis Formation (and laterally equivalent units) in east-central Utah (USA), is laterally variable, generated by either erosion-related processes such as eolian deflation, and water-induced erosion, or by deformational processes. The J-3 Unconformity is a composite surface, formed by numerous processes that interacted and overlapped spatially and temporally. This study therefore demonstrates the heterochronous, diachronous, and non-unique nature of this surface interpreted as unconformity, where one process can be represented by varying expressions in the stratigraphic record, and conversely many processes may result in the same stratigraphic expression.

Bidragsytere

Valentin Zuchuat

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Ivar Midtkandal

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Miquel Poyatos More

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Sigrid Da Costa

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Hannah Louise Brooks

  • Tilknyttet:
    Forfatter
    ved Chiba Daigaku
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