Sangruntau Formation

Sangruntau Fm

Period:

Carboniferous

Age Interval:

Middle Carboniferous, K8

Province:
Kyzylkum Region

Type Locality and Naming

After the Sangruntau Mountains, Central Kyzylkum. K.K. Pyatkov et al. in 1960 (122, p. 76).

Synonym: Sangruntauskaya Suite, Сангрунтауская св.

Lithology and Thickness

According to V.V. Mikhailov (460) - The upper half consists of volcanomictic sandstones, interbedded with jasper-like cherts and rarely volcanites. In the lower part, predominantly basic volcanites - basalts, andesibasalts, and tuffs. Rarely, volcanites of intermediate and acidic composition - andesites, trachyandesites, dacites, and their tuffs. Thickness 700m. (Bukharin et al., 1990; Mikhailov et al., 1988).

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as South Murunkuduk Fm with erosion

Upper contact

Schematic stratigraphic column indicates the upper contact as Zakhkuduk Fm

Regional extent

Central Kyzylkum, Sangruntau Mountains, Northeast Aristantau, North Tamdytau.

GeoJSON

null

Fossils

Among the volcanites, olistoliths and boulders of argillites, cherts, and limestones with Silurian, Devonian, and Carboniferous (up to Bashkirian stage) fauna are noted. Horizons of jasper-like cherts contain conodonts of the late Devonian-early Carboniferous Palmatodella delicatula Br. et M., Palmatolepis glabra Ulr. et Basl., P. cf. hassi Mull., P. aff. proversa Zieg., P. cf. proversa Zieg., P. cf. punctata (Einde) and others. In limestone pebbles - foraminifers - Profusulinella sp., Parastafella sp., Eostaffella sp. - no older than the late Bashkirian time.

Age

Based on these organic remains, the Sangruntau Fm is attributed to the late Devonian-middle Carboniferous. A.K. Bukharin et al. in 1982 in North Tamdytau (122; 1990) distinguished the Sangruntau Fm from the Elemesshin Fm (Elemesachi Fm of Late Carboniferous?) and Akkuduk Fm. According to their data, the Bashkirian age of the suite is determined by its stratigraphic position above the Upper Visean-Lower Bashkirian limestones and below the deposits of the Moscovian stage. In the Strat. sl. (443) it is attributed to the Bashkirian middle Carboniferous; in the monograph (165) - no younger than the Carboniferous; on the State Geol. Map-500 of Uzbekistan (460) it is dated to the Moscovian epoch.

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

323.40

Ending stage:

Bashkirian

Fraction up in the ending stage:

1.0

Ending date (Ma):

315.15

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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