Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?”
Abstract In the central-eastern Sirt Basin, enigmatic Intisar domal structures host significant hydrocarbon accumulations. These structures have been commonly interpreted as pinnacle reefs/bioherms occurring in the open-marine basinal environment. Generally, pinnacle reefs/bioherms are mainly charac...
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2021
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Online Access: | http://dx.doi.org/10.1007/s10347-021-00635-y https://link.springer.com/content/pdf/10.1007/s10347-021-00635-y.pdf https://link.springer.com/article/10.1007/s10347-021-00635-y/fulltext.html |
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crspringernat:10.1007/s10347-021-00635-y 2023-05-15T18:00:59+02:00 Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?” Vršič, A. Gawlick, H.-J. Schlagintweit, F. Machaniec, E. Gharsalla, M. Montanuniversität Leoben 2021 http://dx.doi.org/10.1007/s10347-021-00635-y https://link.springer.com/content/pdf/10.1007/s10347-021-00635-y.pdf https://link.springer.com/article/10.1007/s10347-021-00635-y/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Facies volume 67, issue 4 ISSN 0172-9179 1612-4820 Paleontology Stratigraphy Geology journal-article 2021 crspringernat https://doi.org/10.1007/s10347-021-00635-y 2022-01-04T16:03:11Z Abstract In the central-eastern Sirt Basin, enigmatic Intisar domal structures host significant hydrocarbon accumulations. These structures have been commonly interpreted as pinnacle reefs/bioherms occurring in the open-marine basinal environment. Generally, pinnacle reefs/bioherms are mainly characterized by in situ carbonates. The current study challenges the Intisar pinnacle reef/bioherm model by examining one of the domal structures in terms of biostratigraphy, microfacies and depositional environment. These structures were dated using larger benthic foraminifera, which yielded a Middle to Late Paleocene age (Selandian–Early Thanetian). Thirteen microfacies types representing different carbonate ramp environments ranging from outer ramp to inner ramp, were defined. Outer ramp deposits have been observed adjacent to the domal structure, represented mainly by wackestone with small benthic and planktonic foraminifera. The outer ramp deposits are most likely isochronous to the domal structures. The lower part of the domal structures is composed mainly of foraminiferal–algal–echinodermal packstones. The upper part is characterized by foraminiferal–algal–echinodermal packstones with intercalated microbialite–coral boundstones. The euphotic inner ramp deposits are preserved on the crest of the domal structure, consisting of grainstone and packstone rich in Glomalveolina . As a result of this study, the Intisar domal structures are seen as erosional relics of a carbonate ramp and no evidence for pinnacle reef/bioherm model was found. Article in Journal/Newspaper Planktonic foraminifera Springer Nature (via Crossref) Pinnacle ENVELOPE(-54.900,-54.900,-61.067,-61.067) Facies 67 4 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
Paleontology Stratigraphy Geology |
spellingShingle |
Paleontology Stratigraphy Geology Vršič, A. Gawlick, H.-J. Schlagintweit, F. Machaniec, E. Gharsalla, M. Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?” |
topic_facet |
Paleontology Stratigraphy Geology |
description |
Abstract In the central-eastern Sirt Basin, enigmatic Intisar domal structures host significant hydrocarbon accumulations. These structures have been commonly interpreted as pinnacle reefs/bioherms occurring in the open-marine basinal environment. Generally, pinnacle reefs/bioherms are mainly characterized by in situ carbonates. The current study challenges the Intisar pinnacle reef/bioherm model by examining one of the domal structures in terms of biostratigraphy, microfacies and depositional environment. These structures were dated using larger benthic foraminifera, which yielded a Middle to Late Paleocene age (Selandian–Early Thanetian). Thirteen microfacies types representing different carbonate ramp environments ranging from outer ramp to inner ramp, were defined. Outer ramp deposits have been observed adjacent to the domal structure, represented mainly by wackestone with small benthic and planktonic foraminifera. The outer ramp deposits are most likely isochronous to the domal structures. The lower part of the domal structures is composed mainly of foraminiferal–algal–echinodermal packstones. The upper part is characterized by foraminiferal–algal–echinodermal packstones with intercalated microbialite–coral boundstones. The euphotic inner ramp deposits are preserved on the crest of the domal structure, consisting of grainstone and packstone rich in Glomalveolina . As a result of this study, the Intisar domal structures are seen as erosional relics of a carbonate ramp and no evidence for pinnacle reef/bioherm model was found. |
author2 |
Montanuniversität Leoben |
format |
Article in Journal/Newspaper |
author |
Vršič, A. Gawlick, H.-J. Schlagintweit, F. Machaniec, E. Gharsalla, M. |
author_facet |
Vršič, A. Gawlick, H.-J. Schlagintweit, F. Machaniec, E. Gharsalla, M. |
author_sort |
Vršič, A. |
title |
Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?” |
title_short |
Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?” |
title_full |
Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?” |
title_fullStr |
Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?” |
title_full_unstemmed |
Age, microfacies and depositional environment of the Middle to Late Paleocene shallow-marine carbonates in the Sirt Basin of Libya (Upper Sabil Formation): “Are Intisar domal structures pinnacle reefs?” |
title_sort |
age, microfacies and depositional environment of the middle to late paleocene shallow-marine carbonates in the sirt basin of libya (upper sabil formation): “are intisar domal structures pinnacle reefs?” |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1007/s10347-021-00635-y https://link.springer.com/content/pdf/10.1007/s10347-021-00635-y.pdf https://link.springer.com/article/10.1007/s10347-021-00635-y/fulltext.html |
long_lat |
ENVELOPE(-54.900,-54.900,-61.067,-61.067) |
geographic |
Pinnacle |
geographic_facet |
Pinnacle |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Facies volume 67, issue 4 ISSN 0172-9179 1612-4820 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s10347-021-00635-y |
container_title |
Facies |
container_volume |
67 |
container_issue |
4 |
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1766170295566073856 |