Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria
This study represents a detailed micropaleontological investigation of the composition and diversity of planktonic foraminiferal assemblages from the Upper Turonian to Maastrichtian interval of two deep exploration wells (Al Mahr-1 and Palmyra-1) in the Palmyride area of Syria. In combination with a...
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Croatian Geological Survey
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fthrcak:oai:hrcak.srce.hr:124276 2023-05-15T18:00:49+02:00 Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria Pecimotika, Gabrijela Cvetko Tešović, Blanka Premec Fućek, Vlasta 2014-06-17 application/pdf http://hrcak.srce.hr/124276 http://hrcak.srce.hr/file/183491 en eng Croatian Geological Survey http://hrcak.srce.hr/124276 http://hrcak.srce.hr/file/183491 info:eu-repo/semantics/openAccess Full text of articles are freely accessable. Subscription to print issue is 500,00 Kn (80 Eur) per volume. Geologia Croatica; Vol.67 No.2; ISSN 1330-030X (Print); ISSN 1333-4875 (Online) Planktonic foraminifera Biostratigraphy Phosphatic grains Upper Turonian–Maastrichtian Palmyride region Syria text info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 fthrcak 2015-07-15T22:52:35Z This study represents a detailed micropaleontological investigation of the composition and diversity of planktonic foraminiferal assemblages from the Upper Turonian to Maastrichtian interval of two deep exploration wells (Al Mahr-1 and Palmyra-1) in the Palmyride area of Syria. In combination with a litostratigraphic analysis, this detailed biostratigraphic study provided important new paleoecological and paleoclimatic interpretations and insights into the nature of deposition along the northern passive margin of Gondwana during the Late Cretaceous. The investigated strata belong to three lithostratigraphic units (from base to top): the upper part of the Judea Formation (Upper Turonian–Earliest Santonian), the Soukhne Formation (Santonian–Lower Campanian), and the Shiranish Formation (Upper Campanian–Maastrichtian). The results represent the first detailed determination of planktonic foraminifera from the Palmyidra region. The presence of rich and diverse foraminiferal associations enabled the establishment of the following nine late Turonian to Maastrichtian biostratigraphic zones based on documented index-taxa and/or the entire microfossil assemblages: I) Dicarinella concavata Zone; II) Dicarinella asymetrica Zone; III) Globotruncanita elevaata Zone; IV) Contusotruncana plummerae Zone; V) Radotruncana calcarata Zone; VI) Globotruncanella havanensis Zone;VII) Pseudoguembelina palpebra Zone; VIII) Racemiguembelina fructicosa Zone; and IX) Abathomphalus mayaroensis Zone. The late Turonian to early Campanian foraminiferal assemblages (biozones I-IV) are highly dominated by opportunistic taxa (r-strategists) and suggest a generally fluctuating subtropical climate and deposition in outer shelf environments. The well-preserved and highly diversified late Campanian to Maastrichtian foraminiferal assemblages (biozones V-IX) imply the presence of a well-stratified water column, tropical to subtropical climate, and deposition in outer shelf to upper bathyal environments. A decrease in the number of planktonic species during the late Maastrichtian indicates cooling and deterioration of paleoceanographic conditions. Common occurrence of phosphate grains in the Soukhne Formation (Santonian–Lower Campanian) present an important indicator of specific geological and paleoenvironmental conditions, such as oxygen deficiency, upwelling and transgression. These conditions support the interpretations of high speciation and domination of opportunistic planktonic foraminiferal taxa (heterohelicids and muricohedbergelids) in Biozone II Dicarinella asymetrica Zone. Article in Journal/Newspaper Planktonic foraminifera Hrčak - Portal of scientific journals of Croatia |
institution |
Open Polar |
collection |
Hrčak - Portal of scientific journals of Croatia |
op_collection_id |
fthrcak |
language |
English |
topic |
Planktonic foraminifera Biostratigraphy Phosphatic grains Upper Turonian–Maastrichtian Palmyride region Syria |
spellingShingle |
Planktonic foraminifera Biostratigraphy Phosphatic grains Upper Turonian–Maastrichtian Palmyride region Syria Pecimotika, Gabrijela Cvetko Tešović, Blanka Premec Fućek, Vlasta Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria |
topic_facet |
Planktonic foraminifera Biostratigraphy Phosphatic grains Upper Turonian–Maastrichtian Palmyride region Syria |
description |
This study represents a detailed micropaleontological investigation of the composition and diversity of planktonic foraminiferal assemblages from the Upper Turonian to Maastrichtian interval of two deep exploration wells (Al Mahr-1 and Palmyra-1) in the Palmyride area of Syria. In combination with a litostratigraphic analysis, this detailed biostratigraphic study provided important new paleoecological and paleoclimatic interpretations and insights into the nature of deposition along the northern passive margin of Gondwana during the Late Cretaceous. The investigated strata belong to three lithostratigraphic units (from base to top): the upper part of the Judea Formation (Upper Turonian–Earliest Santonian), the Soukhne Formation (Santonian–Lower Campanian), and the Shiranish Formation (Upper Campanian–Maastrichtian). The results represent the first detailed determination of planktonic foraminifera from the Palmyidra region. The presence of rich and diverse foraminiferal associations enabled the establishment of the following nine late Turonian to Maastrichtian biostratigraphic zones based on documented index-taxa and/or the entire microfossil assemblages: I) Dicarinella concavata Zone; II) Dicarinella asymetrica Zone; III) Globotruncanita elevaata Zone; IV) Contusotruncana plummerae Zone; V) Radotruncana calcarata Zone; VI) Globotruncanella havanensis Zone;VII) Pseudoguembelina palpebra Zone; VIII) Racemiguembelina fructicosa Zone; and IX) Abathomphalus mayaroensis Zone. The late Turonian to early Campanian foraminiferal assemblages (biozones I-IV) are highly dominated by opportunistic taxa (r-strategists) and suggest a generally fluctuating subtropical climate and deposition in outer shelf environments. The well-preserved and highly diversified late Campanian to Maastrichtian foraminiferal assemblages (biozones V-IX) imply the presence of a well-stratified water column, tropical to subtropical climate, and deposition in outer shelf to upper bathyal environments. A decrease in the number of planktonic species during the late Maastrichtian indicates cooling and deterioration of paleoceanographic conditions. Common occurrence of phosphate grains in the Soukhne Formation (Santonian–Lower Campanian) present an important indicator of specific geological and paleoenvironmental conditions, such as oxygen deficiency, upwelling and transgression. These conditions support the interpretations of high speciation and domination of opportunistic planktonic foraminiferal taxa (heterohelicids and muricohedbergelids) in Biozone II Dicarinella asymetrica Zone. |
format |
Article in Journal/Newspaper |
author |
Pecimotika, Gabrijela Cvetko Tešović, Blanka Premec Fućek, Vlasta |
author_facet |
Pecimotika, Gabrijela Cvetko Tešović, Blanka Premec Fućek, Vlasta |
author_sort |
Pecimotika, Gabrijela |
title |
Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria |
title_short |
Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria |
title_full |
Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria |
title_fullStr |
Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria |
title_full_unstemmed |
Planktonic foraminiferal biostratigraphy and paleoecology of Upper Cretaceous deposits from the Palmyride Region, Syria |
title_sort |
planktonic foraminiferal biostratigraphy and paleoecology of upper cretaceous deposits from the palmyride region, syria |
publisher |
Croatian Geological Survey |
publishDate |
2014 |
url |
http://hrcak.srce.hr/124276 http://hrcak.srce.hr/file/183491 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Geologia Croatica; Vol.67 No.2; ISSN 1330-030X (Print); ISSN 1333-4875 (Online) |
op_relation |
http://hrcak.srce.hr/124276 http://hrcak.srce.hr/file/183491 |
op_rights |
info:eu-repo/semantics/openAccess Full text of articles are freely accessable. Subscription to print issue is 500,00 Kn (80 Eur) per volume. |
_version_ |
1766170061881475072 |