Khodzhaakhmet Formation

Khodzhaakhmet Fm

Period:

Cambrian

Age Interval:

Vendian-Lower Cambrian (?), K3

Province:
Kyzylkum Region

Type Locality and Naming

In the Khodzhaakhmet elevation, Bukantau Mountains, Central Kyzylkum. Ya.B. Aysanov et al., 1984. Stratotype in the Khodzhaakhmet elevation area.

Synonym: Khodzhaakhmet Suite, Ходжаахметская св.

Lithology and Thickness

Graphitic-mica-quartz-albite, mica-graphitic-quartz slates, alternating with metasandstones, meta-siltstone (aleurolites), graphitic quartzites. Thickness 500 m.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Stratigraphic boundaries of the suite are unknown.

Upper contact

Stratigraphic boundaries of the suite are unknown. According to Ya.B. Aysanov et al. (1984), it is conformably overlain by the Koksay Fm. But, according to Z.M. Abdouazimova et al. (1985), the Khodzhaakhmet Fm has no stratigraphic contacts and is a metamorphosed analogue of the Koksay Fm

Regional extent

Central Kyzylkum, Altyntau, Kaskyrtau, Turbay, northern slope of Kokpatas, in the form of narrow tectonic blocks. It is correlated with the Kansay Fm and Kurgantau Fm.

GeoJSON

null

Fossils

Organic remains not found.

Age

The age is determined conditionally by its position in the section, lying above Riphean deposits. According to Ya.B. Aysanov et al. (1984), the age of the suite is conditionally Proterozoic-early Paleozoic. A.K. Bukharin et al. (1990) and S.Ya. Lapidus (460) consider the Khodzhaakhmet Fm as the upper sub-suite of the Kokpatas Fm; A.K. Bukharin et al. consider it as middle Ordovician, while S.Ya. Lapidus considers it as upper Riphean. In the monograph (165), the age is conditionally established as Vendian; on the State Geol Map-500 of Uzbekistan (460), it is also conditionally referred to the Vendian with stratigraphically conformable contacts.

Age Span:

Beginning stage:

Ediacaran

Fraction up in beginning stage:

0.0

Beginning date (Ma):

635.00

Ending stage:

Cambrian Stage 4

Fraction up in the ending stage:

1.0

Ending date (Ma):

509.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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