Middle TienShan Gr

Period:

Neogene

Age Interval:

Miocene-Pliocene, CK11

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Part of the Tien Shan complex (TienShan Orogenic Super Gr). B.I. Pinhasov, 1985 (145, p.15-17). Adopted in the Chatkal-Kuramin series of sheets m-1:50000, 1998.

Synonym: Middle Tien Shan Series, Middle Tian Shan Series, Среднетяньшанская сер.

Lithology and Thickness

Represented by a lake gray-colored saline-gypsum (evaporite) formation, formed under conditions of localized sediment accumulation in intermontane depressions and extra-arid climate conditions. Composed of marls, clays, siltstone (aleurolites), sandstones with layers of rock salt and gypsum. Salts are associated with the lower part of the section, gypsums - mainly with the upper. Thickness 2000-3000m.

Lithology Pattern:

Evaporite

Relationships and Distribution

Lower contact

Lies conformably on the Lower TienShan Gr

Upper contact

It is overlain with erosion by the Upper TienShan Gr

Regional extent

Intermontane depressions of the Tien Shan, foothill zone.

GeoJSON

null

Fossils

Contains hipparion fauna outside of Uzbekistan (86; 145; 193; 455). In the lower part of the section, in the Dzhuanaryk and Khalm localities (Kyrgyzstan), an early hipparion fauna is associated - Hipparion cf. moldavicum V. Grom., Chilotherium schlosseri (Web.), Gazella dorcadoides Schl., Tragocerus amalthens Gand.

Age

The lower part of the section, in the Dzhuanaryk and Khalm localities (Kyrgyzstan), an early hipparion fauna suggests late Miocene-early Pliocene age. According to E.A. Dmitrieva (193), Maeotian (Late Miocene). In the red-colored molasses, alluvial-proluvial brown clays and siltstone (aleurolites), which replace the lake gray colors in the marginal parts of the depressions, B. Ubayshashov (86) identified Chiloterium andersoni (Botamoyinak locality, S.-E. Kazakhstan), close to the late Sarmatian Chiloterium sarmaticum of Ukraine, allowing to conditionally limit the lower boundary of the section to the upper Sarmatian. In the upper part of the section, in Ortoke, Alabuka, and Serafimovka (Kyrgyzstan), a late hipparion fauna of Pontian-Cimmerian age is contained (145; 193). Considering that the boundary between the middle and upper Miocene is currently drawn within the Sarmatian, the age of the series is late Miocene to Pliocene (upper Sarmatian-Cimmerian). Includes all formations of this age in the given dictionary.Hence for schematic stratigraphic representation it is considered, Sarmatian (upper)- Cimmerian regional stages [= 70% up in Serravallian to top Zanclean]

Age Span:

Beginning stage:

Serravallian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

12.28

Ending stage:

Zanclean

Fraction up in the ending stage:

1.0

Ending date (Ma):

3.60

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)”