Reconsidering the glaciogenic origin of Gondwana diamictites of the Dwyka Group, South Africa

• Autorzy: Molén Mats O. , Smit J. Johan

Identyfikatory

DOI

10.2478/logos-2022-0008

• Języki publikacji: EN

Abstrakty

EN

The Gondwana Late Palaeozoic Ice Age is probably best represented by the Dwyka Group in South Africa. Striated and grooved surfaces or pavements are commonly considered to have formed subglacially, as are diamictites which have been interpreted as in-situ or reworked tillites. These interpretations were tested by investigation of outcrops in formerly well-studied areas, throughout South Africa. Detailed analyses have focused on striated surfaces/pavements and surface microtextures on quartz sand grains in diamictites. The sedimentological context of four pavements, interpreter to be glaciogenic, display features commonly associated with sediment gravity flows, rather than glaciation. A total of 4,271 quartz sand grains were subsampled from outcrops that are considered mainly to be tillites formed by Continental glaciation. These grains, analysed by SEM, do not demonstrate the characteristic surface microtexture combinations of fracturing and irregular abrasion associated with Quaternary glacial deposits, but mainly a mix of surface microtextures associated with multicyclical grains. The Dwyka Group diamictites warrant reinterpretation as non-glacial sediment gravity flow deposits.

Słowa kluczowe

EN

surface microtexture; sediment gravity flows; Late Palaeozoic Ice Age; pavement; Nooitgedacht

PL

mikrotekstura powierzchni; osad; epoka lodowcowa; nawierzchnie

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2022
• Tom: Vol. 28, No. 2
• Strony: 83--113
• Opis fizyczny: Bibliogr. 165 poz.

Twórcy

autor

Molén Mats O.

• UmeåFoU AB, Vallmov 61, 903 52 Umeå, Sweden

autor

Smit J. Johan

• 9 Gradwell Street, Parys 9585, South Africa

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).