Slump folds within mid-Miocene crevasse-splay deposits : a unique example from the Tomisławice lignite opencast mine in central Poland

• Autorzy: Widera Marek

Identyfikatory

DOI

10.7306/gq.1545

• Języki publikacji: EN

Abstrakty

EN

Non-tectonic, soft-sediment deformation structures occur in mid-Miocene crevasse-splay deposits exposed in the Tomisławice lignite opencast mine in central Poland. The crevasse-splay cross-stratified siliciclastic deposits are underlain by continuously folded and relatively thick lignite beds, and overlain by a thin undisturbed layer of lignite. Only the middle part of the crevasse-splay succession is deformed plastically in the form of folds, while the lower and uppermost beds are undeformed. Most of the intraformational deformation structures are recumbent folds, while only a few can be classified as upright folds in the initial stage of their evolution. The origin of these folds is associated here with a penecontemporaneous slumping process caused by liquefaction of sandy-muddy sediments. The slumping was triggered by an increase in the inclination of heterolithic layers caused by the compactional subsidence of an organic-rich substrate - peat. This type of subsidence occurred following a sudden siliciclastic load on top of the underlying and poorly-compacted peat/lignite seam. The initiation and development of the slump folds can be explained by differentiated loading, compaction and liquefaction processes, and the introduction of a tectonic agent is unnecessary.

Słowa kluczowe

EN

crevasse-splay facies; lignite lithotypes; slump folds; soft-sediment deformation; Konin Basin; Neogene

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2020
• Tom: Vol. 64, No. 3
• Strony: 711--722
• Opis fizyczny: Bibliogr. 80 poz., fot., rys., tab.

Twórcy

autor

Widera Marek

• Institute of Geology, Adam Mickiewicz University, Krygowskiego 12, 61-680 Poznań, Poland

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).