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- Title
Hemipelagic Deposits of the Emsian (Dzhaus Beds, Lower Devonian) in the West of the Zeravshan Range, Kitab Geological Park, Uzbekistan.
- Authors
Mikhailova, E. D.; Tarasenko, A. B.
- Abstract
Depositional settings of hemipelagic deposits of the Emsian (Dzhaus Beds, Zeravshan Range, Khodzha-Kurgan valley) are reconstructed, and the duration of eustatic events in this area is established on the basis of tentaculite and conodont zonation. In the studied region, the Emsian Khodzha-Kurgan transgression began at the end of the pireneae Zone and continued until the end of the patulus Zone. The transgression maximum occurs in the Dzhaus Beds. In the Dzhaus Beds, the presence of traces of two eustatic sea-level rises, accompanied by anoxic sedimentation, and one fall of the paleobasin level were revealed. The conclusions are derived from analysis of the lithology of the Dzhaus Beds and changes in the hydrodynamic regime in the sedimentary basin. Traces of the maximum subsidence of the sea level are recorded in interval 29–72 m of Member 16 (elegans tentaculite Zone, inversus conodont Zone). Sea level rise was recorded in the intervals of the entire Member 15, 0–28 and 73–102 m of Member 16 (elegans and cancellata tentaculite zones, inversus and serotinus conodont zones). In terms of time, the Dzhaus transgressions can be compared with the Czech Late Zlíchovian and Early Dalejan eustatic events. The change in the composition of the Dzhaus cephalopod, brachiopod, and ostracod associations occurs in the elegans tentaculite Zone. This gives the studied section a certain correlation value, since the details of the Emsian transgressions revealed in it can be used in the global correlation of eustatic events and be criteria for substantiate the position of the boundaries of the Emsian substages in the South Tien Shan.
- Subjects
TIEN Shan; UZBEKISTAN; GEOPARKS; ABSOLUTE sea level change; SEDIMENTARY basins; SEA level; DEVONIAN Period; PETROLOGY
- Publication
Stratigraphy & Geological Correlation, 2023, Vol 31, Issue 5, p459
- ISSN
0869-5938
- Publication type
Article
- DOI
10.1134/S0869593823050052