Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications
Based on calcareous nannofossils and planktonic foraminifera1 biostratigraphic data from flysch sequences, we give evidence for the paleoenvironmental evolution of Gavrovo and Ionian foreland basins (External Hellenides, Etoloakarnania region). Our data suggest that the onset of clastic sedimentatio...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown English |
Published: |
2008
|
Subjects: | |
Online Access: | https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3017325 |
id |
ftnkunivathens:oai:lib.uoa.gr:uoadl:3017325 |
---|---|
record_format |
openpolar |
spelling |
ftnkunivathens:oai:lib.uoa.gr:uoadl:3017325 2024-04-14T08:18:30+00:00 Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications Sotiropoulos, S. Triantaphyllou, M.V. Kamberis, E. Tsaila-Monopolis, S. 2008-01-01 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3017325 Αγγλικά English unknown eng uoadl:3017325 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3017325 scientific_publication_article Επιστημονική δημοσίευση - Άρθρο Περιοδικού Scientific publication - Journal Article 2008 ftnkunivathens 2024-03-19T09:00:26Z Based on calcareous nannofossils and planktonic foraminifera1 biostratigraphic data from flysch sequences, we give evidence for the paleoenvironmental evolution of Gavrovo and Ionian foreland basins (External Hellenides, Etoloakarnania region). Our data suggest that the onset of clastic sedimentation in both foreland basins in the study area is chronostratigraphically placed at Late Eocene (from 36.2-34.4 Ma; nannofossil biozones NP19-20, planktonic foraminifera biozones P16-17). During the earliest Oligocene (NP21-22 nannofossil biozones/34.4-32.45 Ma), both basins represent restricted accumulation of sediments, mainly composed of clays and silts. The presence of thick flysch deposits, accumulated during Early Oligocene (33.4-30 Ma, nannofossil zone NP23), indicates an increasing rate of sediment supply. The flysch sequences in the Ionian basin are associated with a distal depositional environment, while in the same time the sedimentation in the external part of Gavrovo basin is related to a more proximal environment that is gradually deepening. On the contrary, the internal part of Gavrovo basin is characterised by deep-water facies, deposited in the Early Oligocene. At the end of Early Oligocene and the onset of Late Oligocene (nannofossil zone NP24/30-27.2 Ma, planktonic foraminifera zone P21), the deposition of coarse grained sediments in both basins indicates a shift to shallower depositional environment. The accumulation of fine-grained sediments during Late Oligocene (27.2-23.2 Ma, NP25 nannofossil biozone) in the Ionian basin marks the youngest flysch sediments in the Etoloakarnania region and specifies the time of the Gavrovo nappe emplacement on the Ionian zone. Moreover the emplacement of Pindos nappe on the Gavrovo zone is estimated between 30-27.2 Ma (NP24 biozone) as supported by the nannofossil analysis of samples in front of Pindos thrust. © 2008 Elsevier Masson SAS. All rights reserved. Article in Journal/Newspaper Planktonic foraminifera Pergamos - Library and Information Center of National and Kapodistrian University of Athens |
institution |
Open Polar |
collection |
Pergamos - Library and Information Center of National and Kapodistrian University of Athens |
op_collection_id |
ftnkunivathens |
language |
unknown English |
description |
Based on calcareous nannofossils and planktonic foraminifera1 biostratigraphic data from flysch sequences, we give evidence for the paleoenvironmental evolution of Gavrovo and Ionian foreland basins (External Hellenides, Etoloakarnania region). Our data suggest that the onset of clastic sedimentation in both foreland basins in the study area is chronostratigraphically placed at Late Eocene (from 36.2-34.4 Ma; nannofossil biozones NP19-20, planktonic foraminifera biozones P16-17). During the earliest Oligocene (NP21-22 nannofossil biozones/34.4-32.45 Ma), both basins represent restricted accumulation of sediments, mainly composed of clays and silts. The presence of thick flysch deposits, accumulated during Early Oligocene (33.4-30 Ma, nannofossil zone NP23), indicates an increasing rate of sediment supply. The flysch sequences in the Ionian basin are associated with a distal depositional environment, while in the same time the sedimentation in the external part of Gavrovo basin is related to a more proximal environment that is gradually deepening. On the contrary, the internal part of Gavrovo basin is characterised by deep-water facies, deposited in the Early Oligocene. At the end of Early Oligocene and the onset of Late Oligocene (nannofossil zone NP24/30-27.2 Ma, planktonic foraminifera zone P21), the deposition of coarse grained sediments in both basins indicates a shift to shallower depositional environment. The accumulation of fine-grained sediments during Late Oligocene (27.2-23.2 Ma, NP25 nannofossil biozone) in the Ionian basin marks the youngest flysch sediments in the Etoloakarnania region and specifies the time of the Gavrovo nappe emplacement on the Ionian zone. Moreover the emplacement of Pindos nappe on the Gavrovo zone is estimated between 30-27.2 Ma (NP24 biozone) as supported by the nannofossil analysis of samples in front of Pindos thrust. © 2008 Elsevier Masson SAS. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Sotiropoulos, S. Triantaphyllou, M.V. Kamberis, E. Tsaila-Monopolis, S. |
spellingShingle |
Sotiropoulos, S. Triantaphyllou, M.V. Kamberis, E. Tsaila-Monopolis, S. Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications |
author_facet |
Sotiropoulos, S. Triantaphyllou, M.V. Kamberis, E. Tsaila-Monopolis, S. |
author_sort |
Sotiropoulos, S. |
title |
Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications |
title_short |
Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications |
title_full |
Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications |
title_fullStr |
Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications |
title_full_unstemmed |
Paleogene terrigenous (flysch) sequences in Etoloakarnania region (W. Greece). Plankton stratigraphy and paleoenvironmental implications |
title_sort |
paleogene terrigenous (flysch) sequences in etoloakarnania region (w. greece). plankton stratigraphy and paleoenvironmental implications |
publishDate |
2008 |
url |
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3017325 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
uoadl:3017325 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3017325 |
_version_ |
1796318000867966976 |