Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

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Chelokteke Formation

Chelokteke Fm

Period:

Ordovician

Age Interval:

Middle-Upper Ordovician (O_2-3?), T1

Province:
East Tajik (NE Pamir)

Type Locality and Naming

Includes in Turzguny-Terezki thrust sheet. Delineated by E. Ya. Levin (1960).

Synonym: Cheloktekinskaya suite, челоктекинская свита, Cheloktekin Fm

Reference section:

Lithology and Thickness

The suite is composed of gray and greenish-gray quartz-sericite and sericite-chlorite phyllites with interbeds of limestones, quartz-feldspar sandstones, and lenses of schistose metabasalts. The incomplete thickness is 1200 m.

Lithology Pattern:

Sandy limestone

Relationships and Distribution

Lower contact

According to its position, it lies on the Kyzashu Fm (кызашуйской свите) of the Lower Ordovician

Upper contact

Overlying deposits unknown.

Regional extent

In the Northern Pamir, it is spread in the Sarykol district.

GeoJSON

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Fossils

In the lower part of the suite, M. S. Dufour and V. I. Dronov discovered remains of Middle Ordovician trilobites Dionide aff. formosa Barr., Trinucleus aff. bucklandi Barr. The top of the suite is not characterized faunistically.

Age

The top of the suite is not characterized faunistically, and the Late Ordovician age is assumed due to the great thickness of this part of the section. S. S. Karaev (1963a) believes that rocks with trilobite remains are exposed in tectonic wedges and therefore cannot characterize the age of the Chelokteke Fm (челоктекинской свиты).

Age Span:

Beginning stage:

Dapingian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

471.26

Ending stage:

Hirnantian

Fraction up in the ending stage:

1.0

Ending date (Ma):

443.07

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Extracted from Rutte, D., L. Ratschbacher, S. Schneider, K. Stübner, M. A. Stearns, M. A. Gulzar, and B. R. Hacker (2017), Building the Pamir-Tibetan Plateau—Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir: 1. Geometry and kinematics, Tectonics, 36, 342–384, doi:10.1002/2016TC004293.