Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Malyangur Formation

Malyangur Fm

Period:

Proterozoic

Age Interval:

Ediacaran, B1

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the Malyangur River, South-West Gissar. V.A. Khokhlov, V.E. Golovin et al. in 1972 (307, p.73).Lower formation in Surkhantau Gr

Synonym: Malyangurskaya Suite, Малянгурская св.

Lithology and Thickness

Divided into three sub-suites: Lower - cordierite-biotite gneisses, Middle - biotite-sillimanite gneisses, and Upper - crystalline biotite slates. The rocks have undergone strong diaphthoresis. The transition from the Lower sub-suite of cordierite-biotite gneisses to the Middle sub-suite of biotite-sillimanite gneisses is gradual. In all sub-suites, among the gneisses and crystalline slates, there are interlayers of quartzites and low-power amphibolites. Thickness 1000-1500m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

The base of the formation is not exposed

Upper contact

It is conformably (?) overlain by the Malyand Fm.

Regional extent

South-West Gissar, Surkhantau Ridge, middle part of the basins of the Malyangur, Obizarang, and Nauran rivers.

GeoJSON

null

Fossils

Age

The Proterozoic age is established very conditionally based on its position in the section and the high degree of metamorphism. According to E.D. Bezuglov et al. (1980), the suite is not an independent subdivision, corresponding to contact-metamorphosed formations of the Malyand Fm of the Lower Paleozoic; in the Strat. sl. (442) it is conditionally Lower Proterozoic; on the State Geolmap-500 of Uzbekistan (460) conditionally dated to the Late Proterozoic.

Age Span:

Beginning stage:

Ediacaran

Fraction up in beginning stage:

0.0

Beginning date (Ma):

635.00

Ending stage:

Ediacaran

Fraction up in the ending stage:

1.0

Ending date (Ma):

538.80

Depositional setting

Depositional pattern:

Additional Information

Compiler:

R.N. Abdullaev – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”