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

Mastavat Formation

Mastavat Fm

Period:

Proterozoic

Age Interval:

Lower Proterozoic (?), B2

Province:
Bukhara-SW Gissar

Type Locality and Naming

Named after the Mastavat River, Gissar Range. E.M. Golovin in 1939-1942 from the pre-middle Paleozoic metamorphic formation (Shargun Suite)

Synonym: Mastavat Suite, Маставатская св.

Lithology and Thickness

Orthogneisses, gneisses, amphibolites, developed on acidic and basic volcanic rocks, with rare layers of crystalline biotite and cordierite slates, marbles, metamorphosed jasperoids, metasiliceous-carbonate rocks (Yudalevich, Divaev et al., 1994). Thickness over 2000 m.

Lithology Pattern:

Gneiss

Relationships and Distribution

Lower contact

Suite is mainly tectonic.

Upper contact

Suites are mainly tectonic, however, in some outcrops in the southern area of its development, the Obizarang Fm is observed to overlie the Mastavat Fm (Yudalevich et al., 1994).

Regional extent

South slope of the Gissar Range, basins of the Kyzyl-Darya, Tanhazy-Darya, Mastavat, Chiliks, Gaznov, and other rivers.

GeoJSON

null

Fossils

Age

Considering the high degree of metamorphism of the Mastavat Suite (amphibolite and epidote-amphibolite facies), as well as the overlying Paleozoic (?) Obizarang Suite, its age is conditionally accepted as early Proterozoic. As carbonates (previously considered lenses and layers) containing organic remains (from the Ordovician to the early Carboniferous) were found in tectonic blocks, the age of the suite was accepted, starting from the late Proterozoic (Ovchinnikov, Tarasenko et al., 1956) to the early Carboniferous (385; Bezuglov et al., 1980). In the monograph (165), it is conditionally dated to the middle Ordovician based on comparison with the middle Ordovician deposits of the Kuljuktau, Zarafshan Range; on the State Geological Map-500 of Uzbekistan (460), it is conditionally dated to the Proterozoic.

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

860.00

Ending stage:

Tonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

720.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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