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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Teshiktash Formation

Teshiktash Fm

Period:

Cretaceous

Age Interval:

Early Cretaceous (K₁? tš), M3a

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

Includes in SE Murghab district (Gurdumdin type section)

Synonym: Teshiktash suite, Тешикташская свита

Reference section:

Lithology and Thickness

In the basin of the Kyzylrabat River, the described suite has, according to V. I. Dranov's data, a three-part structure. The lower part (150 m) is composed of red-brown and gray coarse- and medium-gravel conglomerates with a sandy-carbonate cement. They have interlayers of quartz-feldspar sandstones, tuff conglomerates, and tuffs of andesites and dacites. The middle part (800 m) is composed of alternating purple and red dacites, andesites, dacitic and quartz porphyries. Facies transitions are noted from effusive rocks to intrusive ones. The upper part (up to 120 m) is represented by interbedded tuff conglomerates, tuff breccias, and tuff sandstones. In the basal conglomerates of the Teshiktash suite (тешикташской свиты), pebbles of Callovian limestones are contained. The incomplete thickness of the suite is 1000 m.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

The sediments are transgressively deposited on various horizons of Jurassic rocks, including on the Callovian-Kimmeridgian limestones and marls.

Upper contact

Overlying sediments are unknown.

Regional extent

Its outcrops are known in the southeastern Pamir, in the basin of the Kyzylrabat River (some geologists call this suite Kyzylrabat). In addition, this suite is conditionally distinguished in the southwest Pamir along the northern slope of the Alaychur River valley and near the lakes Bulunkul and Yashilkul.

GeoJSON

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Fossils

Age

The age of the Teshiktash Fm is not reliably established. In this work, the viewpoint of A. M. Meskhi is accepted, according toThis suite is conditionally considered to be early Cretaceous. The basis for such a conclusion lies in the transgressive, without sharp angular discordances, occurrence of the Teshitash suite over the Upper Jurassic limestones and the presence of their pebbles at its base, as well as the results of radiological age determinations of the diorites and monzonites of the Kyzylrat intrusive complex, comagmatic with the volcanics of the Kyzylrat suite. The latter equals 95-130 million years (Meshkhov, 1964), which corresponds to the early Cretaceous period. N. G. Vlasov (1969) shares these views.

Age Span:

Beginning stage:

Aptian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

121.40

Ending stage:

Albian

Fraction up in the ending stage:

1.0

Ending date (Ma):

100.50

Depositional setting

Depositional pattern:

Additional Information

However, P. D. Vinogradov (Geology of the USSR, vol. 24, 1959) considered the volcanics of the Teshitash suite to be Middle Jurassic (Bathonian), as he believed that they overlay the Bajocian limestones, and the pebbles of the volcanics are contained in the facies-proven conglomerates and sandstones of the Callovian. B. P. Barhatov (1963) considered the discussed volcanics to be Upper Cretaceous - Paleogene, assuming that they are spatially closely related to the reddish conglomerates, in the pebbles of which B. P. Barhatov found remains of Lower Cretaceous trigonias. V. I. Budanov and V. I. Drobnov (1964) regarded the Teshitash suite as Paleogene, believing that in age it corresponds to the volcanics of the Bartang series, the age of which, in their opinion, is Paleogene.

Within the Southwestern Pamir, the Teshitash suite conditionally includes variegated (violet, gray, reddish, green) volcanics, exposed in the middle and lower parts of the valleys of the northern tributaries of the Alaychur River, as well as near the Bulunkul and Yashilkul lakes. These are acidic, quartz-porphyritic or albite-phrygian tuffs, dacites, and andesites with a thickness of about 500 m. The conditions of their occurrence are unclear. Apparently, they lie transgressively over the limestones, which are most likely Jurassic. This assumption, as well as the similarity in composition with the volcanics of the actual Teshitash suite, served as the basis for the conditional identification of the described volcanics with the Teshitash suite. This question cannot be considered resolved. G. A. Dutkevich and M. A. Kalmykova (1935) believed that the described volcanics lie at an angular discordance on the shales of the Rhaetian and are overlain at an angular discordance by the limestones of the Upper Lias. P. D. Vinogradov (Geology of the USSR, vol. 24, 1959) held the same opinion.

Compiler:

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