Aksuykon Formation

Aksuykon Fm

Period:

Neogene

Age Interval:

Upper Miocene-Lower Pliocene (?), F4

Province:
Fergana

Type Locality and Naming

Along Lake Aksukon in the city of Akbel, N.-W. Fergana. Yu.R. Smolnikov et al., 1973. Stratotype near Lake Aksukon.

Synonym: Aksukon (Saline) Suite, Аксуйконская (соленосная) св.

Lithology and Thickness

Composed of thick layers of rock salt, interbedded with siltstone (aleurolites), subordinate clays, and gypsums. Rock color is reddish-brown, greenish-gray, and tobacco-colored. Thickness up to 2000m.

Lithology Pattern:

Gypsum-Anhydrite

Relationships and Distribution

Lower contact

Lies presumably conformably on red soil molasses, exposed by wells under saline deposits in the Kyzyljar ridge.

Upper contact

Conformably overlain by the Bakhmaltepin Fm (gypsiferous).

Regional extent

Fergana. Developed in the city of Akbel, Akchop, Supetau. M.N. Gramm (180) correlated the saline suite with the lower part of the Obchak Fm (Miocene-Pliocene).

GeoJSON

null

Fossils

Organic remains are absent.

Age

Age, Along A.A., - upper Miocene-middle Pliocene, Along G.Yu. Alferov et al. (61), - upper Miocene. Corresponds to the saline suite A1 of N.P. Vasilykovsky (126), who considered it Oligocene. V.I. Popov et al. (166) attributed the saline deposits to the lower Miocene. Along I.V. Plechenco et al. (347; 444), - middle-upper Miocene. Under the name Aksukon Fm I.V. Plechenco et al. (347) distinguished overlying lacustrine gypsiferous deposits (see Bahmaltepin Fm). Therefore, the Aksuykon Fm of I.V. Plechenco (444) is not recommended for use. Along B.I. Pinhasov, the saline deposits of Fergana correspond to the lower part of the section of the lacustrine gray salt-gypsum (evaporite) formation of the Middle Tien Shan series and are conditionally attributed to the upper Miocene-lower Pliocene (see Middle Tien Shan series). Accepted in the Chatkal-Kuramin Gr of sheets, m-ba 1:50000, 1998.

Age Span:

Beginning stage:

Messinian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

7.25

Ending stage:

Zanclean

Fraction up in the ending stage:

0.1

Ending date (Ma):

5.16

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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