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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Sarylshilin Formation

Sarylshilin Fm

Period:

Silurian, Devonian, Carboniferous, Permian

Age Interval:

Rhuddanian – Asselian (S-Psr,), MS

Province:
East Tajik (Central Pamir)

Type Locality and Naming

This is the upper formation in the Muzkol Gr

Synonym: Sarydzhilginskaya suite, Сарыджилrинская свита, Sarydzhilgin Fm

Reference section:

Lithology and Thickness

It is composed of interbedded packets of marbles and crystalline slates (up to 50-200 m in thickness), the quantitative ratios of which change along the strike, their facies transitions are noted. The thickness of the suite is 900-1300 m. The marbles are coarse-bedded, banded, yellowish-white and gray, sometimes dark gray. The slates: dark gray and black mica-garnet-graphite, cordierite-graphite (with lenses of amphibole-cordierite-garnet rocks), garnet-disthene; silvery mica-garnet, gray biotite-scapolite, green quartz-actinolite, and chlorite-quartz. In the slates, layers of gray quartzitic sandstones 20-30 m thick and lenticular deposits (30-50 m) of amphibolites, as well as metabasalts, quartz keratophyres, and rhyolites are noted.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

The schematic strat column indicates the lower contact as Beleutin Fm

Upper contact

The schematic strat column indicates the upper contact as Buruliuk Fm

Regional extent

It is widespread in the Central Pamir.

GeoJSON

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Fossils

Age

The youngest detrital Zrn U-Pb age cluster (~295 Ma) in quartzite at the top of the Sarylshilin suite suggests a Permian protolith. (Rutte et al., 2017). Hence considered Silurian to early Permian as the age based on the schematic stratigraphic column.

Age Span:

Beginning stage:

Rhuddanian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

443.07

Ending stage:

Asselian

Fraction up in the ending stage:

1.0

Ending date (Ma):

293.52

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Extracted from Rutte, D., L. Ratschbacher, S. Schneider, K. Stübner, M. A. Stearns, M. A. Gulzar, and B. R. Hacker (2017), Building the Pamir-Tibetan Plateau—Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir: 1. Geometry and kinematics, Tectonics, 36, 342–384, doi:10.1002/2016TC004293; Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.