Stratigraphy and facies of the Middle Paleozoic of parts of southern Tien-Shan in Tajikistan and Uzbekistan

Bardashev, Igor A.; Bardasheva, Nina P.; Weddige, Karsten; Ziegler, Willi

doi:10.1007/bf03043614

Cited by 6 publications

(8 citation statements)

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“…The conodont zones recognized here are in accordance with the Standard Conodont Zones as proposed by Ziegler and Sandberg (1990) and the Devonian Correlation Table of Weddige (2006). On the other hand, the faunal assemblages show affinities with those from East Asia (Ziegler and Wang, 1985), Germany and the Russian Platform (Ziegler et al, 2000), Tajikistan and Uzbekistan (Bardashev et al, 2005), Morocco (Aboussalam and Becker, 2007), southeastern Poland (Narkiewicz and Bultynck, 2007), and Spain (Liao and Valenzuela-Ríos, 2008) as well as North America, Europe, North Africa (Narkiewicz and Bultynck, 2010), and Central Iran (Königshof et. al., 2017).…”

Section: Conodontssupporting

confidence: 88%

Givetian/Frasnian (Middle/Upper Devonian) transition in the eastern Taurides, Turkey

Özkan¹,

Nazik²,

Munnecke³

et al. 2019

Turkish J Earth Sci

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Devonian strata, including siliciclastic and carbonate rocks that were deposited in shallow marine to coastal environments, are widely distributed in the eastern Taurides of southern Turkey. To document the regional formation of the Givetian (Middle Devonian)/ Frasnian (Upper Devonian) boundary, a section in the eastern Taurides was studied in high resolution with regard to biostratigraphy, microfacies, sequence stratigraphy, and the global Frasne Event. The integrated biostratigraphic investigation was based on calcareous benthic foraminifers, ostracods, conodonts, and palynomorphs, which provide a biostratigraphic frame that allows to recognize the Givetian/Frasnian boundary. On the basis of the lithological variation in the outcrop as well as on depositional textures and biotic components as observed in thin sections, fourteen microfacies types of both siliciclastic and carbonate rocks can be distinguished. These microfacies are interpreted to have been deposited in settings that range from distal shelf to lagoonal depositional environments. The sequence stratigraphic interpretation allows to recognize two successive depositional sequences. The first one is a complete sequence including lowstand systems tract deposits, overlain by transgressive systems tract and highstand systems tract deposits. The second sequence is only represented by transgressive systems tract sediments. The Givetian/Frasnian boundary corresponds to the highstand systems tract of Sequence 1. The late Givetian Frasne Event can be detected lithologically and can be compared with other areas. Its position is confirmed biostratigraphically.

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Section: Conodontssupporting

confidence: 88%

Givetian/Frasnian (Middle/Upper Devonian) transition in the eastern Taurides, Turkey

Özkan¹,

Nazik²,

Munnecke³

et al. 2019

Turkish J Earth Sci

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“…elegans Zone. Erbenoceras kimi is not restricted to Uzbekistan, but has also been reported from other localities in the South Tien Shan (Bardashev et al 2005, Nikolaeva et al 2017. We did not find the association Kimoceras lentiforme and B. khanakasuense during our field work in the Khodza-Kurgan Gorge, but it was previously reported from Unit 16 in Becker et al (2010), thus allowing to correlate our new in-situ finds in Shirdag with the Khodza-Kurgan Gorge.…”

Section: Ammonoid Succession and The Daleje Ammonoid Turnoversupporting

confidence: 64%

“…

In Central Asia, Uzbekistan offers the rare opportunity to study the palaeontological inventory in exposures of Cam brian to Recent sediments (Kim et al 2007). Concerning the Palaeozoic sedimentary records, the ZeravshanGissar Mountains located both in Uzbekistan and Tadjikistan are particularly important (Bardashev et al 2005). There, the palaeontological record of the Palaeozoic sequence is both diverse and well preserved.

…”

mentioning

confidence: 99%

“…features that had developed in Central Asia already during the Hercynian orogeny occurred predominantly in zones with transitions between different facies and thus sediment types (Bardashev et al 2005). The Tien Shan is an im portant orogenic system in Central Asia, which formed following the collision of the Indian and Asian plates, which began about 55-50 Ma ago (Pickering et al 2008 and references therein).…”

mentioning

confidence: 99%

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Early Devonian ammonoid faunas in the Zeravshan Mountains (Uzbekistan and Tadjikistan) and the transition from a carbonate platform setting to pelagic sedimentation

Naglik¹,

Baets²,

Klug³

2019

Bull. Geosci.

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In Central Asia, Uzbekistan offers the rare opportunity to study the palaeontological inventory in exposures of Cam brian to Recent sediments (Kim et al. 2007). Concerning the Palaeozoic sedimentary records, the ZeravshanGissar Mountains located both in Uzbekistan and Tadjikistan are particularly important (Bardashev et al. 2005). There, the palaeontological record of the Palaeozoic sequence is both diverse and well preserved. In an area covering 56 km 2 located about 170 km southsoutheast of Samar kand, Ordovician to Carboniferous sediments are well ex posed in a mountainous area. This area is protected since 1979 by the Uzbek government. It is known as the Kitab State Natural Reserve (Fig. 1A) and a research station (Za povednik village) has been created in order to encour age scientific research in this region (Yolkin et al. 1997). In 2004, Uzbekistan even edited stamps depicting an outcrop of the early Emsian in the Khodzha Kurgan Gorge and the early Emsian ammonoid "Mimosphinctes" rudicostatus Bogoslovsky, 1980(Ernst & Klug 2011.The Kitab area is famous for more or less continuous successions ranging from the Middle Ordovician to the early Carboniferous, with shallow water to terrigenous siliceous carbonates in the Devonian part and only moder ate tectonic disturbance according to Yolkin et al. (2008). Moreover, this area is of great importance for researchers focusing on the Early Devonian due to the presence of the Pragian-Emsian Global Boundary Stratotype Section and Point (Yolkin et al. 1997) as well as the rich cephalopod successions in much of the Emsian. The Pragian-Emsian GSSP was defined here because of the excellent conodont record in the Zinzilban Gorge. The current Pragian-Emsian GSSP marks the level where the conodont Polygnathus kitabicus appeared first (Yolkin et al. 1997), although it is currently being revised (Carls et al. 2008, Izokh et al. 2011, Kim et al. 2012. The current boundary is very close to the lithological boundary between the reefal and the pelagic facies (Kim et al. 2012). The origin of this sedi ment ological and palaeoecological transition is one of the 337

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“…Successions spanning the DCB crop out in southern Tien-Shan (western Tajikistan), not far from the border with Uzbekistan (Bardashev et al 2005(Bardashev et al , 2006Bardasheva et al 2004). Three parallel sections, named Shishkat 3, Shishkat 3a and Shishkat 3b, were measured and sampled in detail by Bardasheva et al (2004).…”

Section: Tajikistanmentioning

confidence: 99%

The Devonian-Carboniferous Boundary around the globe: a complement

Aretz

Corradini

Denayer

2021

Palaeobio Palaeoenv

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This article compiles data on the Devonian-Carboniferous Boundary successions from countries and regions, which have not been dealt with separately in this special issue. Data derive from different palaeocontinents on a large palaeoclimatic gradient from the southern high latitudes of western Gondwana through the palaeotropics into the temperate/boreal northern latitudes of Siberia. The quality of the data is variable, but often surprisingly good, although major uncertainties can persist and traditional positions of the boundary do not withhold modern stratigraphic results and concepts. Not all these regions have been on the forefront of the DCB discussions in recent years, but they provide invaluable insights into the regional and global dimensions of uppermost Devonian and lowermost Carboniferous changes in the biosphere and geosphere. Almost globally documented are faunal turnovers and collapse of ecosystems in the Hangenberg extinctions. Those allow the placement of the DCB even if index fossils are absent or scarce. However, it also shows the regional differences, which advocate for a holistic approach to the boundary by ensuring global correlation without relying on the conceptual dominance a single taxon, which might be less powerful outside its usual facies.

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Stratigraphy and facies of the Middle Paleozoic of parts of southern Tien-Shan in Tajikistan and Uzbekistan

Abstract: Detailed descriptions of important sections of va¡Middle Paleozoic facial types from the ZeravshanHissar and Turkestan-Zeravshan structure-facies zones of southern Tien-Shan, located in Tajikistan and Uzbekistan, ate given for the first time.

Cited by 6 publications

References 0 publications

Givetian/Frasnian (Middle/Upper Devonian) transition in the eastern Taurides, Turkey

Givetian/Frasnian (Middle/Upper Devonian) transition in the eastern Taurides, Turkey

Early Devonian ammonoid faunas in the Zeravshan Mountains (Uzbekistan and Tadjikistan) and the transition from a carbonate platform setting to pelagic sedimentation

The Devonian-Carboniferous Boundary around the globe: a complement

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