Stratigraphic signatures of punctuated rise in relative sea-level in an estuary-dominated heterolithic succession: Incised valley fills of the Toarcian Ostreaelv Formation,Neill Klinter Group (Jameson Land,East Greenland) |
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| Institution: | 1. N.A. Shilo Northeast Interdisciplinary Scientific Research Institute, Far Eastern Branch, Russian Academy of Sciences, ul. Portovaya 16, Magadan, 685000, Russia;2. Kazan Federal University, ul. Lenina 18, Kazan, 420008, Russia;3. Far East Geological Institute, Far Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia;4. BLT Wieselburg, HBLFA Francisco-Josephinum, Rottenhauserstrasse, 1, 3250 Wieselburg, Austria;5. Karl-Franzens-Universitat Graz, Heinrichstrasse, 26, Graz, 8010, Austria;6. Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, pr. Lenina 38, Yakutsk, 677891, Russia;7. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;8. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;9. Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia;1. Dipartimento di Scienze della Terra, La Sapienza Università di Roma, P. Aldo Moro 5, I-00185 Roma Italy;2. Istituto di Geologia Ambientale e Geoingegneria (IGAG) CNR, Sez. Sapienza, c/o Dipartimento Scienze della Terra, P. Aldo Moro 5, I-00185 Roma Italy;3. Dipartimento di Ingegneria e Geologia, Universita degli Studi “G. d''Annunzio” Chieti-Pescara, via dei Vestini 31, 66013 Chieti, Italy |
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| Abstract: | The Ostreaelv Formation (latest Pliensbachian–Toarcian) of the Neill Klinter Group is exposed along a >105 km wide, ENE-trending section in Jameson Land, East Greenland. Deposition took place in a large embayment (Jameson Land Basin) that was connected to the proto-Norwegian-Greenland Sea. Lithofacies in the Ostreaelv Formation range from clean sandstone to muddy heterolithic facies typified by strong grain-size contrasts.The Ostreaelv Formation is divided into four distinct and overall retrograding allostratigraphic units each composed of a characteristic set of tide-influenced, tide-dominated and wave-influenced facies associations. The allostratigraphic units are bounded by subaerial unconformities, interpreted as sequence boundaries, and are up to 75 m thick and 16 to >20 km in width. The allostratigraphic units include a sandy heterolithic estuary bay-head delta succession overlain by two sandy tide-dominated estuary fill successions, interbedded with a muddy heterolithic offshore marine succession. Each of the three estuarine allostratigraphic units was accumulated in an incised valley formed during fall in relative sea level and filled during successive transgressions with sediment supplied from marine and reworked fluvial deposits.In the three incised valleys fluvial sediments were deposited on top of an initial subaerial unconformity surface (SU) and were later reworked by succeeding transgressive ravinement along a transgressive surface (TS), thus creating combined SU/TS sequence boundaries. The data from the Ostreaelv Formation also provides knowledge and conceptual understanding of valley infill processes (tidal current, wave and fluvial energy), and both lateral and vertical variations in lithofacies architecture within incised valleys.Moreover, the study provides quantitative input data, such as incised valley dimensions, sand-containing capacity, and geometry to subsurface reservoir characterisation and modelling efforts of estuary fill successions. |
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| Keywords: | Tide-dominated Incised valley Estuary Early Jurassic East Greenland |
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