Uchkuduktau Formation

Uchkuduktau Fm

Period:

Proterozoic

Age Interval:

Lower Proterozoic (?), K5

Province:
Kyzylkum Region

Type Locality and Naming

By col. Uchkuduk, S. Tamdytau, C. Kyzylkumy. Sh.Sh.Sabdyushev et al., 1969 (393, p.6). Stratotype by Uchkuduksay.

Synonym: Uchkuduktau Suite, Учкудуктауская св.

Lithology and Thickness

Divided into two sub suites.

Upper - sericite-chlorite-quartz, muscovite-chlorite-plagioclase, epidote-quartz-albite, carbonaceous-muscovite-albite-quartz slates with siliceous interlayers.

Lower - alternating amphibolites, leucocratic garnet-plagioclase-muscovite, albite-actinolite slates. Thickness 400m.

Thickness 600m. Total thickness of the suite is about 1000 m.

Lithology Pattern:

Clayey sandstone

Relationships and Distribution

Lower contact

Stratigraphic boundaries unknown, contacts everywhere tectonic.

Upper contact

Stratigraphic boundaries unknown, contacts everywhere tectonic.

Regional extent

Central Kyzylkumy, on the north and east of the Tamdytau Mountains (Karatas col. and Dzhamankyngyrtau Mountains area). It is correlated with the Majerum Fm and Kumbulak Fm.

GeoJSON

null

Fossils

Organic remains not found.

Age

Early Proterozoic age is determined conditionally based on the significant difference in the degree of metamorphism of the rocks compared to the overlying Riphean and Lower Paleozoic deposits. Sh.Sh.Sabdyushev, B.V.Yaskovich et al. (393) considered the age of the suite to be Middle Riphean based on its position under the Akkuduk Fm of the Riphean, A.K.Bukharin et al. (122) assigned it to the Ordovician-Silurian based on chitinozoan finds. Along the data of Z.M.Abdazimova et al. (1978f.; 1981f.), chitinozoans were found in tectonic blocks of slightly metamorphosed terrigenous rocks of the Tayman Fm, located among the development area of the Uchkuduktau Fm rocks. In the Strat. sl. (442) the suite is conditionally referred to the Proterozoic; in the monograph (165) and on the State Geol. Map-500 of Uzbekistan (460) - conditionally to the Lower Proterozoic.

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

1,000.00

Ending stage:

Tonian

Fraction up in the ending stage:

0.7

Ending date (Ma):

804.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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