Comparative analysis of marine paleogene sections and biota from West Siberia and the Arctic Region

Akhmet’ev, M. A.; Zaporozhets, N. I.; Iakovleva, Alina I.; Александрова, Г. Н.; Beniamovsky, V. N.; Oreshkina, T. V.; Gnibidenko, Z.N.; Dolya, Zh.A.

doi:10.1134/s0869593810060043

Cited by 24 publications

(13 citation statements)

References 19 publications

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“…All other coastlines during the Paleogene sea incursions were drawn based on the results of this study and Peri‐Tethys atlas (Dercourt et al, ). Palaeogeographical changes in the Turgai Strait and Siberian Sea were drawn based on Radionova et al (), Akhmetiev and Beniamovski (), Akhmetiev et al (), and our new results. Corresponding facies during the transgressions and regressions can also be seen on the palaeogeographic maps.…”

Section: Discussionmentioning

confidence: 77%

“…33.3 Ma in south Tarim at the Aertashi section, correlates well with the Siberian Sea regression occurring at ca. 34 Ma (Akhmetiev et al, ) and has been previously interpreted to relate to the ca. 100 m sea level drop at the Eocene‐Oligocene transition (Bosboom et al, ).…”

Section: Discussionmentioning

confidence: 90%

“…39.7 to 36.7 Ma but did not reach south Tarim where basin infilling was particularly strong (Figures and c). The 3rd Paleogene sea incursion does not correspond in timing with the last Siberian Sea incursion (Akhmetiev et al, ) or the early Priabonian eustatic fluctuations (Bosboom et al, ; Haq et al, ; Kominz et al, ) (Figure ). These together suggest that the 3rd Paleogene sea incursion was not primarily driven by eustasy.…”

Section: Discussionmentioning

confidence: 99%

“…Regional coastlines and depositional environments during the maximum Paleogene sea advances and retreats were drawn based on the results of this study and integrated with existing literature. The updated palaeo‐reconstructions of Poblete et al () integrating continental reference points, palaeotopography and shorelines were updated with data from the Darius project (Barrier et al, ), Peri‐Tethys atlas (Dercourt et al, ), the compilation of Bosboom et al () and palaeogeographical changes in the Turgai Strait and West Siberian Sea were drawn based on Radionova et al (), Akhmetiev and Beniamovski (), Akhmetiev et al ().…”

Section: Discussionmentioning

confidence: 99%

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Paleogene evolution and demise of the proto‐Paratethys Sea in Central Asia (Tarim and Tajik basins): Role of intensified tectonic activity at ca. 41 Ma

et al. 2019

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The proto‐Paratethys Sea covered a vast area extending from the Mediterranean Tethys to the Tarim Basin in western China during Cretaceous and early Paleogene. Climate modelling and proxy studies suggest that Asian aridification has been governed by westerly moisture modulated by fluctuations of the proto‐Paratethys Sea. Transgressive and regressive episodes of the proto‐Paratethys Sea have been previously recognized but their timing, extent and depositional environments remain poorly constrained. This hampers understanding of their driving mechanisms (tectonic and/or eustatic) and their contribution to Asian aridification. Here, we present a new chronostratigraphic framework based on biostratigraphy and magnetostratigraphy as well as a detailed palaeoenvironmental analysis for the Paleogene proto‐Paratethys Sea incursions in the Tajik and Tarim basins. This enables us to identify the major drivers of marine fluctuations and their potential consequences on Asian aridification. A major regional restriction event, marked by the exceptionally thick (≤ 400 m) shelf evaporites is assigned a Danian‐Selandian age (ca. 63–59 Ma) in the Aertashi Formation. This is followed by the largest recorded proto‐Paratethys Sea incursion with a transgression estimated as early Thanetian (ca. 59–57 Ma) and a regression within the Ypresian (ca. 53–52 Ma), both within the Qimugen Formation. The transgression of the next incursion in the Kalatar and Wulagen formations is now constrained as early Lutetian (ca. 47–46 Ma), whereas its regression in the Bashibulake Formation is constrained as late Lutetian (ca. 41 Ma) and is associated with a drastic increase in both tectonic subsidence and basin infilling. The age of the final and least pronounced sea incursion restricted to the westernmost margin of the Tarim Basin is assigned as Bartonian–Priabonian (ca. 39.7–36.7 Ma). We interpret the long‐term westward retreat of the proto‐Paratethys Sea starting at ca. 41 Ma to be associated with far‐field tectonic effects of the Indo‐Asia collision and Pamir/Tibetan plateau uplift. Short‐term eustatic sea level transgressions are superimposed on this long‐term regression and seem coeval with the transgression events in the other northern Peri‐Tethyan sedimentary provinces for the 1st and 2nd sea incursions. However, the 3rd sea incursion is interpreted as related to tectonism. The transgressive and regressive intervals of the proto‐Paratethys Sea correlate well with the reported humid and arid phases, respectively in the Qaidam and Xining basins, thus demonstrating the role of the proto‐Paratethys Sea as an important moisture source for the Asian interior and its regression as a contributor to Asian aridification.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Paleogene evolution and demise of the proto‐Paratethys Sea in Central Asia (Tarim and Tajik basins): Role of intensified tectonic activity at ca. 41 Ma

et al. 2019

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“…The level of SL is marked by a sud den drop in δ 13 C, a sharp increase in the abundance of thermophilic dinocysts of the genus Apectodinium, and a sharp increase in the abundance of calcareous nan noplankton and marine dinocysts against the general fall in the abundance of palynomorphs of land plants, which suggests an increase in the depth of the basin following a global transgression at the beginning of the Eocene and a global PETM episode. The level with peak of Apectodinium is a stratigraphic marker, defin ing the base of the Eocene in the Northern Hemi sphere from the Indian Ocean to the Polar Arctic (Akhmetiev et al, 2010(Akhmetiev et al, , 2013. Interestingly, Bore holes 1215, 1220, and 1221 contain contrasting assem blages of benthic foraminifers, dominated either by agglutinated species or secreting species with calcare ous test wall.…”

Section: Crisis In the Communities Of Deep Water Benthic Foraminifersmentioning

confidence: 99%

Deep-Water Benthic Foraminifers from the Paleocene and Eocene of the North Pacific Region: Paleontology, Biostratigraphy, and Paleoceanological Reconstructions

Olshanetskiy

2015

Stratigr. Geol. Correl.

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I/Ca evidence for upper ocean deoxygenation during the PETM

et al. 2014

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Anthropogenic global warming affects marine ecosystems in complex ways, and declining ocean oxygenation is a growing concern. Forecasting the geographical and bathymetric extent, rate, and intensity of future deoxygenation and its effects on oceanic biota, however, remains highly challenging because of the complex feedbacks in the Earth-ocean biota system. Information on past global warming events such as the Paleocene-Eocene Thermal Maximum (PETM,~55.5 Ma), a potential analog for present and future global warming, may help in such forecasting. Documenting past ocean deoxygenation, however, is hampered by the lack of sensitive proxies for past oceanic oxygen levels throughout the water column. As yet no evidence has been presented for pervasive deoxygenation in the upper water column through expansion of oxygen minimum zones (OMZs). We apply a novel proxy for paleoredox conditions, the iodine to calcium ratio (I/Ca) in bulk coarse fraction sediment and planktonic foraminiferal tests from pelagic sites in different oceans, and compared our reconstruction with modeled oxygen levels. The reconstructed iodate gradients indicate that deoxygenation occurred in the upper water column in the Atlantic, Indian Oceans, and possibly the Pacific Ocean, as well during the PETM, due to vertical and potentially lateral expansion of OMZs.

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Comparative analysis of marine paleogene sections and biota from West Siberia and the Arctic Region

Cited by 24 publications

References 19 publications

Paleogene evolution and demise of the proto‐Paratethys Sea in Central Asia (Tarim and Tajik basins): Role of intensified tectonic activity at ca. 41 Ma

Paleogene evolution and demise of the proto‐Paratethys Sea in Central Asia (Tarim and Tajik basins): Role of intensified tectonic activity at ca. 41 Ma

Deep-Water Benthic Foraminifers from the Paleocene and Eocene of the North Pacific Region: Paleontology, Biostratigraphy, and Paleoceanological Reconstructions

I/Ca evidence for upper ocean deoxygenation during the PETM

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