Stratigraphic Emmental: High-resolution allostratigraphy reveals multiple intra-formational unconformities in shallow ramp mudstone: Upper Cretaceous, Western Canada Foreland Basin

Hooper, Elizabeth A.; Plint, A. Guy

doi:10.24425/agp.2023.145622

Artykuł - szczegóły

Tytuł artykułu

Stratigraphic Emmental: High-resolution allostratigraphy reveals multiple intra-formational unconformities in shallow ramp mudstone: Upper Cretaceous, Western Canada Foreland Basin

Autorzy

Hooper Elizabeth A. , Plint A. Guy

Treść / Zawartość

Pełne teksty:

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Identyfikatory

DOI

10.24425/agp.2023.145622

Warianty tytułu

Języki publikacji

Abstrakty

Marine mudstone of Coniacian age (c. 89.51–86.49 Ma) was deposited on a storm-dominated ramp spanning the foredeep of the Cretaceous Western Canada Foreland Basin. Marine flooding surfaces define 18 allomembers that thin over 300 km, from c. 140 m in the proximal foredeep to c. 20 m close to the forebulge crest. The broadly conformable succession of allomembers is partitioned into five ‘tectono-stratigraphic units’ by low-angle unconformities that bevel off c. 10 to 20 m of strata over ‘arches’ that have a length scale of c. 50–100 km and are bounded by relatively linear zones of flexure. Depositional history involved two alternate modes: ‘Background’ deposition of subtly-tapered allomembers took place on a planar sea floor, subject to regional flexural subsidence, with sea-level modulated by Milankovitch-scale (c. 125 kyr) eustatic cycles. ‘Flexural’ events deformed the strata into troughs and arches across narrow zones of flexure. Arch crests were bevelled off, probably by submarine wave erosion. Eroded sediment did not accumulate in troughs but was advected beyond the study area by storm-driven processes. Cycles of deposition, warping and erosion were repeated five times on an average timescale of 600 kyr. Arches and troughs do not coincide with Precambrian basement structures, and their origin remains enigmatic. Changes in in-plane stress may have effected the localized vertical motion.

Słowa kluczowe

allostratigraphy upper cretaceous Alberta foreland basin mudstone tectonics

allostratygrafia górna kreda Alberta basen przedgórski mułowce tektonika

Wydawca

Faculty of Geology of the University of Warsaw
Komitet Nauk Geologicznych PAN

Czasopismo

Acta Geologica Polonica

Rocznik

2023

Tom

Vol. 73, no. 4

Strony

773--799

Opis fizyczny

Bibliogr. 89 poz., rys., tab., wykr.

Twórcy

autor

Hooper Elizabeth A.

Department of Earth Sciences, The University of Western Ontario, London, Ontario, Canada
WSP E&I Canada Limited, 3450 Harvester Road, Suite 100, Burlington, Ontario, Canada

autor

Plint A. Guy

gplint@uwo.ca

Department of Earth Sciences, The University of Western Ontario, London, Ontario, Canada

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Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).

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