Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, Uzbekistan
Lithostratigraphy and isotopes of Paleogene sequences consisting mainly of terrestrial clastics and limestone were examined in the northern Fergana Basin of Uzbekistan. The studied sections consisted of two facies: the lower sequence coarse-grained terrestrial clastics and the upper sequence limesto...
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2022-05-01
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| author | Otabek Ulugbek Ogli Anvarov Yoshihito Kamata Teruyuki Maruoka Junichiro Kuroda Shigeyuki Wakaki Ken-ichiro Hisada |
| author_facet | Otabek Ulugbek Ogli Anvarov Yoshihito Kamata Teruyuki Maruoka Junichiro Kuroda Shigeyuki Wakaki Ken-ichiro Hisada |
| author_sort | Otabek Ulugbek Ogli Anvarov |
| collection | DOAJ |
| description | Lithostratigraphy and isotopes of Paleogene sequences consisting mainly of terrestrial clastics and limestone were examined in the northern Fergana Basin of Uzbekistan. The studied sections consisted of two facies: the lower sequence coarse-grained terrestrial clastics and the upper sequence limestone clastics characterized by limestone beds. The sulfur isotopic composition of the bivalve obtained from the lower sequence was relatively low, namely, 14.94–16.82‰, which is equivalent to the Early Cretaceous; however, it is possible that the isotopic composition differed from that obtained in open seawater due to the presence of terrestrial clastics and the freshwater effect. In contrast, the sulfur isotopic composition of limestone from the upper sequence was relatively high, namely, 19.37–21.19‰, thereby indicating that they were likely to originate from the Early to Middle Eocene. Furthermore, the strontium isotopic compositions of the lower and upper sequences were 0.707772–0.707875‰ and 0.707812–0.708063‰, respectively. These values are more similar to those of the Paleogene than the Cretaceous. Finally, lithostratigraphy and age determination allowed us to correlate the upper sequence with representative limestone from the fourth transgression of the proto-Paratethys Sea, whilst the limestone beds were deduced to be remnants of the Eocene marine incursion of the proto-Paratethys Sea. |
| first_indexed | 2024-03-10T03:49:38Z |
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| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-10T03:49:38Z |
| publishDate | 2022-05-01 |
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| spelling | doaj.art-c6d6bdcbb38640538affc41353dc51cc2023-11-23T11:12:12ZengMDPI AGGeosciences2076-32632022-05-0112520310.3390/geosciences12050203Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, UzbekistanOtabek Ulugbek Ogli Anvarov0Yoshihito Kamata1Teruyuki Maruoka2Junichiro Kuroda3Shigeyuki Wakaki4Ken-ichiro Hisada5Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, JapanDepartment of Geosciences, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, JapanDepartment of Geosciences, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, JapanAtmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-0882, JapanKochi Institute for Core Sample Research, Japan Agency for Marine—Earth Science and Technology (JAMSTEC), Nankoku 782-8502, JapanDepartment of Geosciences, Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, JapanLithostratigraphy and isotopes of Paleogene sequences consisting mainly of terrestrial clastics and limestone were examined in the northern Fergana Basin of Uzbekistan. The studied sections consisted of two facies: the lower sequence coarse-grained terrestrial clastics and the upper sequence limestone clastics characterized by limestone beds. The sulfur isotopic composition of the bivalve obtained from the lower sequence was relatively low, namely, 14.94–16.82‰, which is equivalent to the Early Cretaceous; however, it is possible that the isotopic composition differed from that obtained in open seawater due to the presence of terrestrial clastics and the freshwater effect. In contrast, the sulfur isotopic composition of limestone from the upper sequence was relatively high, namely, 19.37–21.19‰, thereby indicating that they were likely to originate from the Early to Middle Eocene. Furthermore, the strontium isotopic compositions of the lower and upper sequences were 0.707772–0.707875‰ and 0.707812–0.708063‰, respectively. These values are more similar to those of the Paleogene than the Cretaceous. Finally, lithostratigraphy and age determination allowed us to correlate the upper sequence with representative limestone from the fourth transgression of the proto-Paratethys Sea, whilst the limestone beds were deduced to be remnants of the Eocene marine incursion of the proto-Paratethys Sea.https://www.mdpi.com/2076-3263/12/5/203Fergana Basinisotopic analysesmarine incursionPaleogeneproto-Paratethys Seastrontium isotope |
| spellingShingle | Otabek Ulugbek Ogli Anvarov Yoshihito Kamata Teruyuki Maruoka Junichiro Kuroda Shigeyuki Wakaki Ken-ichiro Hisada Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, Uzbekistan Geosciences Fergana Basin isotopic analyses marine incursion Paleogene proto-Paratethys Sea strontium isotope |
| title | Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, Uzbekistan |
| title_full | Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, Uzbekistan |
| title_fullStr | Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, Uzbekistan |
| title_full_unstemmed | Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, Uzbekistan |
| title_short | Paleogene Lithostratigraphy and Recognition of the Marine Incursion of the Proto-Paratethys Sea in the Fergana Basin, Uzbekistan |
| title_sort | paleogene lithostratigraphy and recognition of the marine incursion of the proto paratethys sea in the fergana basin uzbekistan |
| topic | Fergana Basin isotopic analyses marine incursion Paleogene proto-Paratethys Sea strontium isotope |
| url | https://www.mdpi.com/2076-3263/12/5/203 |
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