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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Deire Formation

Deire Fm

Period:

Permian

Age Interval:

Upper Permian, 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 is the lower-middle formation in Gan Gr

Synonym: Дейринская толща, Dayrin Fm, Dayrinskaya formation,

Reference section:

Lithology and Thickness

“We do not follow the subdivision of the Gan Gr, as there is a considerable lateral lithological variability. Distinctive are however the breccias and conglomerates (Karasu Fm) at the top of the formation “ (Angiolini et al., 2015). But, therefore, this Deire Fm would correspond to their description of: “The middle part of the Gan Gr is dominated by colored volcaniclastic ashes interbedded with thin-bedded nodular limestones and cherts. This unit is more evident in the Kubergandy section than in the Kutal 2 section.” [For a single pattern on paleogeography graphics, the volcanoclastic aspect is highlighted:]

Lithology Pattern:

Volcanic ash

Relationships and Distribution

Lower contact

It conformably overlies the Dhzamantal Fm (джамантальской толще)

Upper contact

With erosion, it is covered by the conglomerates of the Karasu Fm (карасинской толщей).

Regional extent

It is widespread in the Southeast Pamir.

GeoJSON

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Fossils

The few foraminifers in the Dayrin Fm (дейринской толще) include representatives of Neoschwagerina, Sumatrina, Verbeekina, Minojapanella, Yangchienia, similar to those present in the underlying Dhzamantal Fm (джамантальской толще). See Gan Gr for full discussion of later biostratigraphy.

Age

Schematic column by Angiolini et al. (2015) of the Kutal 2 and Kubergandy sections suggests this facies spans the Wordian.

Age Span:

Beginning stage:

Wordian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

269.21

Ending stage:

Wordian

Fraction up in the ending stage:

1.0

Ending date (Ma):

264.34

Depositional setting

The maximum depth is recorded by the radiolarian and sponge wackestones intercalated to cherts and colored volcaniclastic ashes, just below the conglomerates.

Depositional pattern:

Additional Information

Compiler:

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

Angiolini, L., et al. (11 authors) (2015) From rift to drift in South Pamir (Tajikistan): Permian evolution of a Cimmerian terrane. Jour. Asian Earth Sciences, 102: 146-169. http://dx.doi.org/10.1016/j.jseaes.2014.08.001