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

Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple

Lyangar Formation

Lyangar Fm

Period:

Proterozoic

Age Interval:

Neoproterozoic (PR₁? ln), R1

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

This is the upper/second formation in the Alichur Gr.

Synonym: Lyangarskaya Suite, Лянгарская свита

Reference section:

Lithology and Thickness

Composed of alternating biotite and mica schists, migmatites, quartzites, and crystalline biotite shales. In some layers, schists with garnet and amphibole are encountered. The incomplete thickness of the suite is 2000 m.

Lithology Pattern:

Gneiss

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Marganay Fm

Upper contact

Schematic stratigraphic column indicates the upper contact as Zvordarin Fm

Regional extent

It is developed in the Southwestern Pamir- Rushan, Alichur, and Wakhan ranges. Zvordarin Fm is separated from the surrounding rocks everywhere by breaks and granitic masses, and only in the upper reaches of the Patkhor River, according to V. P. Bulin, formations of the Lyangar Fm are in agreement with it.

GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[71.6,37.74],[71.88,37.81],[72.04,37.88],[72.29,37.89],[72.51,37.85],[72.81,37.85],[73,37.83],[73.14,37.78],[73.43,37.67],[73.52,37.51],[73.04,37.44],[72.59,37.47],[72.06,37.4],[71.9,37.43],[71.56,37.39],[71.56,37.71],[71.6,37.74]]]]}}

Fossils

Age

Neoproterozoic

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.6

Beginning date (Ma):

832.00

Ending stage:

Tonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

720.00

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.