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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Chinar Formation

Chinar Fm

Period:

Carboniferous

Age Interval:

Late Carboniferous (C₃?sf), C2, C2a

Province:
Central W Tajik

Type Locality and Naming

Includes in Dushanbe-west Shirkent-Luchob, east Shirkent-Luchob. It was delineated in 1971 by D.A. Starshinin.

Synonym: Chinarskaya formation, Чинарская свита

Reference section:

Lithology and Thickness

It is composed of andesite-dacite volcanics. Rhyolite-dacite composition with lenses, interlayers of conglomerates, and blocks of limestones. Incomplete thickness 1000 m.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

a sharply unconformable occurrence of Zarkuin Fm

Upper contact

overlying rocks are unknown

Regional extent

GeoJSON

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Fossils

contains, according to D. A. Starshinin, remains of Early Moscovian foraminifera. In the pebbles of conglomerates, there are uniformly granular granites of the normal series, similar in petrographic and petrochemical properties to the granites of the Late Carboniferous South Vazhab complex (D. A. Starshinin considers it Middle Carboniferous).

Age

The age of the Chinar Fm (чинарокой Свиты) D. A. Starshinin considers Early Moscovian, taking into account the discovered shells of corresponding foraminifera, as well as the similarity of the suite rocks to the tops of the Karatag series, which belong to the Lower Moscovian substage. However, the presence in the conglomerates of fragments of granites, close to the Late Carboniferous, and a sharply unconformable occurrence on the underlying suite of Late Bashkirian - Early Moscovian age, allows to suggest that the Chinarskaya suite may have a younger age, and the foraminiferas enclosed in the blocks of limestones (along with the last ones) may turn out to be in a secondary occurrence.

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.2

Beginning date (Ma):

313.52

Ending stage:

Moscovian

Fraction up in the ending stage:

1.0

Ending date (Ma):

307.02

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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