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

Katarmay Formation

Katarmay Fm

Period:

Proterozoic

Age Interval:

Proterozoic (?), Z5

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Katarmai Mountains in the northern part of the Ziaetdin Mountains. A.S. Adelung in 1946 (460, pp.41-42). Stratotype in the central watershed part of the Katarmai Mountains. In this volume, the Katamay Fm is accepted in the present dictionary.

Synonym: Katarmai Suite, Катармайская св.

Lithology and Thickness

Crystalline schists: albite-chlorite, albite-chlorite-actinolite, albite-amphibole, albite-epidote-amphibole, quartz-albite-mica, graphitic, carbonaceous, less frequently quartzites, ferruginous quartzites, and marbles. Thickness 2500m.

The Katamay Fm includes the first and second sub-suites according to V.S. Korsakov (1984).

Tectonic wedges of pelitomorphic limestones with Paleozoic fauna, identified in the Kyzybibi Fm, conditionally of Silurian-Devonian age, and weakly metamorphosed ankaramite basalts and their tuffs, are excluded from their composition.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Stratigraphic contacts are unknown.

Upper contact

Stratigraphic contacts are unknown.

Regional extent

Eastern part of the northern slope of the Ziaetdin Mountains and the southwestern part of the South Nuratau Range.

GeoJSON

null

Fossils

There are indications of the presence of Precambrian microfossils and problematica (517) in the rocks of the suite, but the strong metamorphism raises doubts about the preservation of paleontological objects.

Age

Considering the intense (epidote-amphibolite facies) regional metamorphism of the rocks, a Proterozoic age for the suite is conditionally accepted.The age of the Katamay Fm is debatable. L.N. Belkova, V.N. Ognev, et al. (101), B.V. Yaskovich, et al. (517), I.M. Mirkhodzhaev, et al. (304; 306) attributed the K. suite to the Proterozoic; Yu.A. Likhachev, et al. (266) - to the Lower Paleozoic; Z.M. Abdurazimova, et al. (18), V.S. Korsakov, E.I. Barkovskaya, et al. (1984), E.S. Sorokin, et al. (1973) based on collections of organic remains in carbonate rocks, considered the age of the suite to be Silurian-Devonian; Kh.V. Ryskina, et al. (1955) believed that limestones and dolomites with Paleozoic fauna are preserved in narrow synclinal troughs and should not be included in the composition of metaterrigenous deposits of the Katamay Fm. Along R.N. Abdullaev, M.A. Akhmedjanov, et al. (32), V.V. Mikhailov (1988), the section of the Katarmai Ridge has a complexly foliated structure and is characterized by the alternation of metamorphosed Proterozoic formations with carbonate volcanogenic deposits of the Upper Silurian-Lower Devonian (460). On the State Geological Map -500 of Uzbekistan (Along the proposal of V.S. Korsakov, 460), only crystalline schists, quartzites, and marbles are attributed to the Katamay Fm; pelitomorphic limestones with Silurian-Lower Devonian fauna, which are tectonic wedges, are excluded from its composition and attributed to the Kyzybibi Fm.

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

804.00

Ending stage:

Ediacaran

Fraction up in the ending stage:

0.5

Ending date (Ma):

586.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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