Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkey
The Western Black Sea basin formed during therifting of the Moesian Platform in Early Cretaceous. The closure of the Neotethys Ocean in the Middle Eocene resulted in the formation of the Pontide fold and thrust belt in northern Turkey. During this study, eight seismic reflection profiles were interp...
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| Format: | Article |
| Language: | English |
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General Directorate of Mineral Research and Exploration
2021-04-01
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| Series: | Bulletin of the Mineral Research and Exploration |
| Subjects: | |
| Online Access: | https://dergipark.org.tr/tr/pub/bulletinofmre/issue/56453/777892 |
| _version_ | 1797907151287484416 |
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| author | İbrahim Çemen Özgür Türkmen |
| author_facet | İbrahim Çemen Özgür Türkmen |
| author_sort | İbrahim Çemen |
| collection | DOAJ |
| description | The Western Black Sea basin formed during therifting of the Moesian Platform in Early Cretaceous. The closure of the Neotethys Ocean in the Middle Eocene resulted in the formation of the Pontide fold and thrust belt in northern Turkey. During this study, eight seismic reflection profiles were interpreted to determine the subsurface structural geometry and tectono-stratigraphic evolution of the offshore Akçakoca-Amasra area. The stratigraphy of the study area is determined based on a composite wireline well log of the Akçakoca-1 wildcat well, which was also used to construct a velocity model based onsonic data. We suggest that a major décollement surface was developed during the Eocene Pontide Orogeny. The decollement is located at the limestone clay-shale intraformational transition within the Late Cretaceous (Maastrichtian) - Paleocene Akveren Formation. Normal faults formed during the Cretaceous rifting in the region are located below the décollement surface. They provide tectonic ramps along the décollement surface and allow the decollement to develop ramp-flat thrust fault geometry. A well-developed duplex structure is also present along the seismic lines. The décollement surface serves as the floor thrust of the duplex structure. The roof thrust of the duplex is in the Pliocene Sarıkum formation, dominantly composed of claystone. |
| first_indexed | 2024-04-10T10:33:10Z |
| format | Article |
| id | doaj.art-5f4cb59b6db148eb97ce1e7513e9d81f |
| institution | Directory Open Access Journal |
| issn | 0026-4563 |
| language | English |
| last_indexed | 2024-04-10T10:33:10Z |
| publishDate | 2021-04-01 |
| publisher | General Directorate of Mineral Research and Exploration |
| record_format | Article |
| series | Bulletin of the Mineral Research and Exploration |
| spelling | doaj.art-5f4cb59b6db148eb97ce1e7513e9d81f2023-02-15T16:21:02ZengGeneral Directorate of Mineral Research and ExplorationBulletin of the Mineral Research and Exploration0026-45632021-04-0116416416518210.19111/bulletinofmre.77789276Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkeyİbrahim Çemen0Özgür Türkmen1University of Alabama, Department of Geology, Tuscaloosa, Al, 35406General Directorate of Mineral Research and Exploration, Marine Researches Department, Ankara, TurkeyThe Western Black Sea basin formed during therifting of the Moesian Platform in Early Cretaceous. The closure of the Neotethys Ocean in the Middle Eocene resulted in the formation of the Pontide fold and thrust belt in northern Turkey. During this study, eight seismic reflection profiles were interpreted to determine the subsurface structural geometry and tectono-stratigraphic evolution of the offshore Akçakoca-Amasra area. The stratigraphy of the study area is determined based on a composite wireline well log of the Akçakoca-1 wildcat well, which was also used to construct a velocity model based onsonic data. We suggest that a major décollement surface was developed during the Eocene Pontide Orogeny. The decollement is located at the limestone clay-shale intraformational transition within the Late Cretaceous (Maastrichtian) - Paleocene Akveren Formation. Normal faults formed during the Cretaceous rifting in the region are located below the décollement surface. They provide tectonic ramps along the décollement surface and allow the decollement to develop ramp-flat thrust fault geometry. A well-developed duplex structure is also present along the seismic lines. The décollement surface serves as the floor thrust of the duplex structure. The roof thrust of the duplex is in the Pliocene Sarıkum formation, dominantly composed of claystone.https://dergipark.org.tr/tr/pub/bulletinofmre/issue/56453/777892western black seadecollementtectonic ramppontide orogeny |
| spellingShingle | İbrahim Çemen Özgür Türkmen Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkey Bulletin of the Mineral Research and Exploration western black sea decollement tectonic ramp pontide orogeny |
| title | Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkey |
| title_full | Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkey |
| title_fullStr | Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkey |
| title_full_unstemmed | Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkey |
| title_short | Role of the Cretaceous normal faults on the formation of the Eocene (Pontide) fold-thrust belt structures in offshore Akcakoca-Amasra area, Western Black Sea basin, Turkey |
| title_sort | role of the cretaceous normal faults on the formation of the eocene pontide fold thrust belt structures in offshore akcakoca amasra area western black sea basin turkey |
| topic | western black sea decollement tectonic ramp pontide orogeny |
| url | https://dergipark.org.tr/tr/pub/bulletinofmre/issue/56453/777892 |
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