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Cretaceous

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Triassic

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Carboniferous

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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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Minbulak Formation

Minbulak Fm

Period:

Carboniferous

Age Interval:

Lower-Middle Carboniferous (C1-2? Mn), S1

Province:
North Tajik

Type Locality and Naming

It is identified by N. P. Vas'kovskiy (1952).

Synonym: Minbulakskaya suite, Минбуrлакская свита

Reference section:

Lithology and Thickness

To date, the Minbulakskaya suite has been reliably established only in the Altintopkan depression. The...According to the data by A. B. Dzaynukov and other geologists, obtained by 1974, this suite here consists of the following rocks (from bottom to top): 1 - tuff sandstones, tuffs and andesito-basalt clastolaves with rare interlayers of thinly bedded limestones and marls; 2 - grey bituminous clayey and sandy limestones with interlayers of dolomites, tuff sandstones and andesito-basalt tuffs; 3 - medium-bedded light grey limestones; 4 - tuff sandstones and tuffs of andesites, interbedded with siliceous slates and containing individual interlayers of limestone; 5 - tuffs of andesites and andesito-basalts. The total thickness of the suite is about 350 m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

It lies conformably on the limestones of the Turonian and Viséan stages

Upper contact

is unconformably overlain by the Middle Carboniferous Akchin Fm (акчинской свиты) of volcanics.

Regional extent

It is widespread in the Karamazar district.

GeoJSON

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Fossils

In the limestones of the middle part of the Minbulak suite (минбулакской свиты) section, A. B. Dzaynukov and Yu. M. Kuzichkina collected in 1961 the remains of brachiopods, among which, along with upper Viséan Spirifer attenuata Sow., Pulilis pugulis Phill., etc., Namurian Productus concinnus Sow., Pr. corrugatus McCoy, Chonetes cf. schmiereri Paeck, etc. are present.

Age

Based on these collections and the indicated stratigraphic position of the Minbulak suite, it can be considered that it belongs to the Namurian (Mississippian) stage of the Lower Carboniferous and, in some part, probably to the Middle Carboniferous.

Age Span:

Beginning stage:

Tournaisian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

359.30

Ending stage:

Visean

Fraction up in the ending stage:

1.0

Ending date (Ma):

330.34

Depositional setting

Depositional pattern:

Additional Information

A. B. Dzaynukov and some other researchers distinguish the lower, predominantly sedimentary part of the given section into a separate suite and correlate it with the Uya suite by N. P. Vasilykovsky (1952). In the rest of the Karamazar region, the Minbulak suite is almost completely eroded and is preserved only partially in the Adrasman depression and the Tokmak sag, where it is represented by weakly powerful packages of siliceous slates, sandstones and tuff sandstones, lying at the base of the Upper Paleozoic sedimentary-volcanogenic complex of Karamazara

Compiler:

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