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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Luchob Formation

Luchob Fm

Period:

Permian

Age Interval:

Lower Permian (P₁? Lc), S4

Province:
North Tajik

Type Locality and Naming

The suite was established by S. K. Ovchinnikov and A. T. Tarasenko (Geology of the USSR, vol. 24, 1959).

Synonym: Luchobskaya suite, Лучобская свита

Reference section:

Lithology and Thickness

It is composed of red-colored felsites, dacites, liparites, tuffs, tuff breccias, and ignimbrites. At the base, there are basal conglomerates. The thickness of the suite is 650-1500 m. Five thicknesses have been distinguished in its section: basal (25 - 300 m), felsite (25 - 300 m), lower dacite (60 m), liparite (30-270 m), upper dacite (30-130 m). A sixth, trachyandesite thickness, is occasionally present. All of them have been studied and described in detail by R. B. Baratov, E. N. Goretskaya, and S. I. Shchukin (1973b).

Subvolcanic intrusions of granodiorite-porphyries, dacite porphyries, and quartz latite-porphyrobs are associated with the rocks of the Luchobskaya suite.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

The Luchobskaya suite lies with a sharp angular discordance on all older rocks, including the phyllite of the upper Moscow - Upper Carboniferous Muborak Fm.

Upper contact

It is covered with a slight angular discordance by red conglomerates of the Upper Permian Lower Triassic Khanakin Fm.

Regional extent

It is widespread in the South Gissar region, its analogs are conditionally distinguished on very small areas in the Zarafshan-Gissar region (Baratov et al., 1974).

GeoJSON

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Fossils

Organic remains in the Luchob Fm have not been found.

Age

Its attribution to the Lower Permian is conditional, based on its position in the section.

Age Span:

Beginning stage:

Asselian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

298.89

Ending stage:

Sakmarian

Fraction up in the ending stage:

1.0

Ending date (Ma):

290.51

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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