Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections)
The Early - Middle Miocene transition can be studied in several sections from the north-western Transylvanian Basin, across the boundary between the Hida and Dej Formations. The Pâglişa and Râpa Dracului (Dej locally outcrop) sections offer a very good record of the changes in the sedimentary facies...
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ftdoajarticles:oai:doaj.org/article:8b397b2812d345e79bb778f24234ab79 2023-05-15T18:00:56+02:00 Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections) Claudia Beldean Răzvan Bercea Sorin Filipescu 2013-01-01T00:00:00Z https://doi.org/10.5038/1937-8602.58.1.5 https://doaj.org/article/8b397b2812d345e79bb778f24234ab79 EN eng Cluj University Press http://scholarcommons.usf.edu/geologia/vol58/iss1/art5/ https://doaj.org/toc/1221-0803 https://doaj.org/toc/1937-8602 http://dx.doi.org/10.5038/1937-8602.58.1.5 1221-0803 1937-8602 https://doaj.org/article/8b397b2812d345e79bb778f24234ab79 Studia Universitatis Babes-Bolyai: Geologia, Vol 58, Iss 1, Pp 57-70 (2013) Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5038/1937-8602.58.1.5 2022-12-31T08:11:23Z The Early - Middle Miocene transition can be studied in several sections from the north-western Transylvanian Basin, across the boundary between the Hida and Dej Formations. The Pâglişa and Râpa Dracului (Dej locally outcrop) sections offer a very good record of the changes in the sedimentary facies and micropaleontological content across the boundary. The lower parts of the sections display the upper Hida Formation with prodelta fine grained sediments covered by coarser grained sediments related to a delta front progradation. Four sedimentary facies associations have been separated based on grain size and associated sedimentary structures. Micropaleontological assemblages are moderately to poorly preserved, with a low abundance and diversity. Planktonic Streptochilus pristinum is the main taxon associated with rare (< 10%) calcareous benthic foraminifera (Bulimina, Bolivina, Cibibicidoides). The Dej Formation consists of stacked channel lag deposits associated with lateral accretion bars and crevasse splays followed by fall-out tuffs and redeposited low density tuffites interbedded with low density fine siliciclastics. The deposits of Dej Formation from the investigated areas were separated in four facies associations based on grain size/petrography and primary sedimentary structures. Micropaleontological assemblages contain typical early Badenian planktonic foraminifera (species of Orbulina, Praeorbulina, Globigerinoides, and Globorotalia) associated to the main phase of the marine transgresion from the beginning of the Middle Miocene. Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Studia Universitatis Babes-Bolyai, Geologia 58 1 57 70 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Geology QE1-996.5 |
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Geology QE1-996.5 Claudia Beldean Răzvan Bercea Sorin Filipescu Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections) |
topic_facet |
Geology QE1-996.5 |
description |
The Early - Middle Miocene transition can be studied in several sections from the north-western Transylvanian Basin, across the boundary between the Hida and Dej Formations. The Pâglişa and Râpa Dracului (Dej locally outcrop) sections offer a very good record of the changes in the sedimentary facies and micropaleontological content across the boundary. The lower parts of the sections display the upper Hida Formation with prodelta fine grained sediments covered by coarser grained sediments related to a delta front progradation. Four sedimentary facies associations have been separated based on grain size and associated sedimentary structures. Micropaleontological assemblages are moderately to poorly preserved, with a low abundance and diversity. Planktonic Streptochilus pristinum is the main taxon associated with rare (< 10%) calcareous benthic foraminifera (Bulimina, Bolivina, Cibibicidoides). The Dej Formation consists of stacked channel lag deposits associated with lateral accretion bars and crevasse splays followed by fall-out tuffs and redeposited low density tuffites interbedded with low density fine siliciclastics. The deposits of Dej Formation from the investigated areas were separated in four facies associations based on grain size/petrography and primary sedimentary structures. Micropaleontological assemblages contain typical early Badenian planktonic foraminifera (species of Orbulina, Praeorbulina, Globigerinoides, and Globorotalia) associated to the main phase of the marine transgresion from the beginning of the Middle Miocene. |
format |
Article in Journal/Newspaper |
author |
Claudia Beldean Răzvan Bercea Sorin Filipescu |
author_facet |
Claudia Beldean Răzvan Bercea Sorin Filipescu |
author_sort |
Claudia Beldean |
title |
Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections) |
title_short |
Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections) |
title_full |
Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections) |
title_fullStr |
Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections) |
title_full_unstemmed |
Sedimentology and biostratigraphy of the Early-Middle Miocene transition in NW Transylvanian Basin (Pâglişa and Dej sections) |
title_sort |
sedimentology and biostratigraphy of the early-middle miocene transition in nw transylvanian basin (pâglişa and dej sections) |
publisher |
Cluj University Press |
publishDate |
2013 |
url |
https://doi.org/10.5038/1937-8602.58.1.5 https://doaj.org/article/8b397b2812d345e79bb778f24234ab79 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Studia Universitatis Babes-Bolyai: Geologia, Vol 58, Iss 1, Pp 57-70 (2013) |
op_relation |
http://scholarcommons.usf.edu/geologia/vol58/iss1/art5/ https://doaj.org/toc/1221-0803 https://doaj.org/toc/1937-8602 http://dx.doi.org/10.5038/1937-8602.58.1.5 1221-0803 1937-8602 https://doaj.org/article/8b397b2812d345e79bb778f24234ab79 |
op_doi |
https://doi.org/10.5038/1937-8602.58.1.5 |
container_title |
Studia Universitatis Babes-Bolyai, Geologia |
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58 |
container_issue |
1 |
container_start_page |
57 |
op_container_end_page |
70 |
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