RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS

The North Dobrogean Orogen (NDO) is a NW-SE trending fold-and-thrust belt in the eastern foreland of the Alpine Carpathian Orogen, palaeogeographically representing the westernmost segment of the Palaeotethys-issued Cimmeride Orogenic System. Eastwards, the NDO structurally extends into the Romania...

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Autores principales:	LIDIJA KORAT, MARIE-BÉATRICE FOREL, TEA KOLAR-JURKOVŠEK, EUGEN GRĂDINARU, LUKA GALE
Formato:	article
Lenguaje:	EN
Publicado:	Università degli Studi di Milano 2021
Materias:	Romania; North Dobrogean Orogen; Upper Triassic; olistolith; foraminifer; ostracod; palaeoecology. Geology QE1-996.5 Paleontology QE701-760
Acceso en línea:	https://doaj.org/article/635b969c99ff4c959bc559708cf0fd73
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spelling	oai:doaj.org-article:635b969c99ff4c959bc559708cf0fd732021-11-12T09:18:36ZRHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS10.13130/2039-4942/167170035-68832039-4942https://doaj.org/article/635b969c99ff4c959bc559708cf0fd732021-11-01T00:00:00Zhttps://riviste.unimi.it/index.php/RIPS/article/view/16717https://doaj.org/toc/0035-6883https://doaj.org/toc/2039-4942 The North Dobrogean Orogen (NDO) is a NW-SE trending fold-and-thrust belt in the eastern foreland of the Alpine Carpathian Orogen, palaeogeographically representing the westernmost segment of the Palaeotethys-issued Cimmeride Orogenic System. Eastwards, the NDO structurally extends into the Romanian sector of the western Black Sea continental shelf. The Triassic development of North Dobrogea is well known for its Tethyan-type facies and richness in various groups of fossils, but little attention has been paid to microfacies and fossil content of the offshore Triassic. The drill hole 817 LV of the Lebăda Vest oilfield, offshore Romania, ends in the Rhaetian (Upper Triassic) limestone olistolith, from which a rich association of foraminifers and ostracods was recovered. The limestone also contains sponge spicules, mollusc fragments, echinoderm ossicles, bryozoans, and brachiopods. Foraminiferal assemblage from the residue consists of agglutinated species only. Tolypamminids, Gaudryinopsis triadica (Kristan-Tollmann), G. triassica (Trifonova), G. kelleri (Tappan), Ammobaculites tzankovi (Trifonova), A. zlambachensis Kristan-Tollmann, Verneuilinoides racema (Trifonova), and Trochammina spp. predominate. Non-agglutinated species, determined from thin sections include Ophthalmidium spp., and rare involutinids Trocholina ex gr. intermedia/umbo and “Involutina turgida” (Involutina ex gr. liassica). The rich ostracod assemblage is dominated by Bairdiidae. Species of the Paracyprididae and Sigilliidae families are rather common. The conodont Norigondolella steinbergensis (Mosher) was also found. The deposition is suggested to take place in a relatively deep setting (outer shelf) offshore heterozoan-dominated platform in relatively cool waters. LIDIJA KORATMARIE-BÉATRICE FORELTEA KOLAR-JURKOVŠEKEUGEN GRĂDINARULUKA GALEUniversità degli Studi di MilanoarticleRomania; North Dobrogean Orogen; Upper Triassic; olistolith; foraminifer; ostracod; palaeoecology.GeologyQE1-996.5PaleontologyQE701-760ENRivista Italiana di Paleontologia e Stratigrafia, Vol 127, Iss 3 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Romania; North Dobrogean Orogen; Upper Triassic; olistolith; foraminifer; ostracod; palaeoecology. Geology QE1-996.5 Paleontology QE701-760
spellingShingle	Romania; North Dobrogean Orogen; Upper Triassic; olistolith; foraminifer; ostracod; palaeoecology. Geology QE1-996.5 Paleontology QE701-760 LIDIJA KORAT MARIE-BÉATRICE FOREL TEA KOLAR-JURKOVŠEK EUGEN GRĂDINARU LUKA GALE RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS
description	The North Dobrogean Orogen (NDO) is a NW-SE trending fold-and-thrust belt in the eastern foreland of the Alpine Carpathian Orogen, palaeogeographically representing the westernmost segment of the Palaeotethys-issued Cimmeride Orogenic System. Eastwards, the NDO structurally extends into the Romanian sector of the western Black Sea continental shelf. The Triassic development of North Dobrogea is well known for its Tethyan-type facies and richness in various groups of fossils, but little attention has been paid to microfacies and fossil content of the offshore Triassic. The drill hole 817 LV of the Lebăda Vest oilfield, offshore Romania, ends in the Rhaetian (Upper Triassic) limestone olistolith, from which a rich association of foraminifers and ostracods was recovered. The limestone also contains sponge spicules, mollusc fragments, echinoderm ossicles, bryozoans, and brachiopods. Foraminiferal assemblage from the residue consists of agglutinated species only. Tolypamminids, Gaudryinopsis triadica (Kristan-Tollmann), G. triassica (Trifonova), G. kelleri (Tappan), Ammobaculites tzankovi (Trifonova), A. zlambachensis Kristan-Tollmann, Verneuilinoides racema (Trifonova), and Trochammina spp. predominate. Non-agglutinated species, determined from thin sections include Ophthalmidium spp., and rare involutinids Trocholina ex gr. intermedia/umbo and “Involutina turgida” (Involutina ex gr. liassica). The rich ostracod assemblage is dominated by Bairdiidae. Species of the Paracyprididae and Sigilliidae families are rather common. The conodont Norigondolella steinbergensis (Mosher) was also found. The deposition is suggested to take place in a relatively deep setting (outer shelf) offshore heterozoan-dominated platform in relatively cool waters.
format	article
author	LIDIJA KORAT MARIE-BÉATRICE FOREL TEA KOLAR-JURKOVŠEK EUGEN GRĂDINARU LUKA GALE
author_facet	LIDIJA KORAT MARIE-BÉATRICE FOREL TEA KOLAR-JURKOVŠEK EUGEN GRĂDINARU LUKA GALE
author_sort	LIDIJA KORAT
title	RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS
title_short	RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS
title_full	RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS
title_fullStr	RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS
title_full_unstemmed	RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS
title_sort	rhaetian foraminifers from the western black sea shelf: new evidence for heterozoan carbonate factories in the palaeotethys
publisher	Università degli Studi di Milano
publishDate	2021
url	https://doaj.org/article/635b969c99ff4c959bc559708cf0fd73
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RHAETIAN FORAMINIFERS FROM THE WESTERN BLACK SEA SHELF: NEW EVIDENCE FOR HETEROZOAN CARBONATE FACTORIES IN THE PALAEOTETHYS

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