Otavautek Gr

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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Otavautek Gr

Period:

Neoproterozoic

Age Interval:

Tonian (Rf? Sal), M1-M3d

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

Includes in SE Murghab district (Mynkhadjr type), SE Murghab district (Istyk type (Dunkeldyk area), SE Murghab district (Gurdumdin type), SE Murghab district (Gurdumdin type Kastanatdjilga, Buryukurmes rivers), SE Murghab district (Gurdumdin type Shin and Igrymiyu rivers), SE Murghab district (Gurdumdin type Gurumd and Kattamardzhana rivers).

This series was distinguished in 1967 by V. I. Dronov.

Synonym: Otavautekskaya series

Lithology and Thickness

V. I. Dronov believes that the described deposits, with more detailed study, may form an independent series, which he suggests calling Otavautek Gr. Then each of the layers can be considered in the rank of a suite, for which he proposes the following names (from bottom to top): Zortor Fm, Kokbulak Fm, Kultchak Fm, and Tumuk Fm. Deposits with a similar structure are exposed in the tectonic wedge on the watershed of the rivers Dzhanbai and Kalaktash. They have a visible thickness of 1500-2000 m and are composed of gray and greenish-gray quartzitic sandstones, quartzites, quartz-chlorite-sericite slates with interlayers of greenstone-altered basic volcanics, marbles, marbleized limestones, gravellites, and conglomerates.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Tumuk Fm

Upper contact

In the upper reaches of the river Kattamarjana and the valley of the river Zurchertseck, the Otavautek Gr is overlain with an angular unconformity, according to V. I. Dronov, to the base of the lower coal-bearing? - lower Permian Bazardarin Fm (V. P. Novikov believes that the layer of siltstones with basal conglomerates, exposed in the valley of the river Zurchertseck, has Triassic or Jurassic age).

Regional extent

It is widespread in the Southeast Pamir.

GeoJSON

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Fossils

Age

Tonian

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

1,000.00

Ending stage:

Tonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

720.00

Depositional setting

Depositional pattern:

Additional Information

The questions regarding the position of the described deposits in the geological section of the Southern Pamir, their age, stratification, and the possibility of considering them in the rank of "series" require further research.

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.