Four in one : a new crevasse-splay complex in the middle Miocene of central Poland

• Autorzy: Widera Marek , Dziamara Mariusz , Klęsk Jakub , Wachocki Robert

Identyfikatory

DOI

10.14241/asgp.2024.04

• Języki publikacji: EN

Abstrakty

EN

This article focuses on a newly identified set of crevasse splays in the lignite-bearing Miocene of Poland. The sand bodies studied are situated within the First Mid-Polish Lignite Seam (MPLS-1) in the Tomisławice opencast mine, located near Konin in central Poland. The sand bodies form an alluvial complex of four superposed crevasse splays, separated by lignite layers, 0.1–0.8 m thick. They are considered to be overbank lateral splays, emplaced laterally by a fluvial channel, rather than its terminal splays. Their combined thickness reaches ~5 m, their length is <0.6 km and width <0.4 km, and their total area is ~0.1 km². Nearly half of the sediments examined are subaerial deposits, while the rest are typical of crevasse-splay microdeltas, accumulated in a floodplain subaqueous environment. The sand bodies with local clay lenses are both underlain and overlain by, as well as interbedded with a range of lignite lithotypes, representing various sub-environments of a mid-Miocene mire (backswamp) realm. The estimated time span for the formation of the entire crevasse-splay complex, recording four short-term floods, is at least 48 kyr. The crevasse-splay complex is one of the best developed in lignite/coal successions worldwide. However, it poses a major technical obstacle to mining activity in the Konin Lignite Mine.

Słowa kluczowe

EN

Alluvial system; backswamp; Konin Basin; lignite seam; mire; Neogene; overbank sedimentation

• Wydawca: Polskie Towarzystwo Geologiczne
• Czasopismo: Annales Societatis Geologorum Poloniae
• Rocznik: 2024
• Tom: Vol. 94, No. 1
• Strony: 1--18
• Opis fizyczny: Bibliogr.126 poz., fot., rys., tab., wykr.

Twórcy

autor

Widera Marek

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

• https://orcid.org/0000-0001-5092-2845

autor

Dziamara Mariusz

• Konin Lignite Mine, 600-lecia 9, 62-540 Kleczew, Poland

autor

Klęsk Jakub

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

autor

Wachocki Robert

• Konin Lignite Mine, 600-lecia 9, 62-540 Kleczew, Poland

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