Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

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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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Kyzylsui Formation

Kyzylsui Fm

Period:

Triassic

Age Interval:

Carnian (T_2-3? kz), D1

Province:
SW Tajik

Type Locality and Naming

Delineated by A. Kh. Kafarsky and I. V. Pyzyanov (1963). The Kyzylsui suite was delineated by A. Kh. Kafarsky andThe Afar and I.V. Pyzyanov (1963) from the suite established in 1937 by M.I. Shabalkin called the Myn-Teke suite (мынтекинсkой свиты).

Synonym: Kyzylsuiskaya Suite, Кызылсуйская свита, Myn-Teke suite, мынтекинсkой свиты.

Reference section:

Lithology and Thickness

The suite is composed of a powerful series of sedimentary-volcanogenic rocks: interbedded greenish-gray, gray or purple-gray polymictic conglomerates, graywacke sandstones and gravels, containing horizons of andesitic porphyrites, their brecciated tuffs, tuff conglomerates, siltstones, claystones and carbonaceous rocks.

In the western part of the Zaalaik Range, in the basin of the Surkhangou, Kyzylsu and Myn-Teke rivers, the Kyzylsui suite is mainly represented by conglomerates. Its thickness is 800-1300 meters. In the eastern direction, towards the valley of the Chakmantash river, in this suite sandstones predominate, containing interlayers of brecciated tuffs, andesitic porphyrites and black carbonaceous claystones. The incomplete thickness of the suite here is 600 meters. In cobbles and boulders in the Kyzylsui suite, gray and pink granites, plagio-granites and albite-phylites; green and purple porphyrites, as well as sandstones and limestones of the Carbon-Permian of the Northern Pamir are universally present.

In the valley of the Chakmantash river, in the upper part of the section of the Kyzylsui suite, in the interlayers of black carbonaceous shales.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

The Kyzylsui suite lies with erosion, and in the western part of the district with angular unconformity on red-colored conglomerates, attributed to the Iolliharsk Fm (Murgab? horizon of the Upper Permian)

Upper contact

It is conformably overlain by dark-colored volcanics of the Zuryuzamin Fm, tentatively assigned to the Upper Triassic.

Regional extent

It is distributed in the north-eastern part of the Kyzylsui Fm of the Darvaz district.

GeoJSON

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Fossils

R. N. Shamssudinov found plant fossils, identified by T. A. Sikshtel. Their list is published (Geol. USSR, v. 23, 1972, book 1, p. 370): Equisetites cf. arenaceus Jaeg., Neuropteridium sp., Danaeopsis (?) angustipinnata Brick., Pterophyllum sp., Taeniopteris sp.

Age

In this work, this flora, and with it the Kyzylsui suite, is tentatively assigned to the Middle Triassic. In her preliminary conclusions, T. A. Sikshtel noted that the species D. (?) angustipinnata Brick is identical to the one described by M. I. Brick from the lower Keiper of Kazakhstan, i.e., from the lower parts of the Upper Triassic (Decisions..., 1959). Obviously, the collected flora is insufficient for a confident determination of the age of the Kyzylsui suite, therefore, following E. F. Romanenko and E. S. Chernykh, who studied it in the eastern part of the district, it is tentatively assigned to the Middle-Late Triassic.The suite under consideration probably corresponds only to part of the upper section of the Triassic system, since the conformably overlying Zuryuzamin Fm (зюрюзаминская свита) is also assigned, albeit tentatively, to the Upper Triassic.

Age Span:

Beginning stage:

Carnian

Fraction up in beginning stage:

0.2

Beginning date (Ma):

235.06

Ending stage:

Carnian

Fraction up in the ending stage:

1.0

Ending date (Ma):

227.30

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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