Sultanuizdag Gr

Period:

Proterozoic, Cambrian, Ordovician, Silurian, Devonian

Age Interval:

Staherian?- Pragian, U5

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

Along the Sultanuzdag Ridge. V.V. Mikhailov, 2000 (460, pp.38-39).

Synonym: Sultanuzdag Series, Султануиздагская сер.

Lithology and Thickness

In its composition, deeply metamorphosed formations of the Uruksay Fm, Sultanuzdag Fm, Dzhamansay Fm, and Karakuduk Fm are included, metamorphosed in the amphibolite and epidote-amphibolite facies.

Crystalline schists: albite-quartz-muscovite, quartz-mica, biotite-staurolite, actinolite-feldspar-biotite, tremolite-actinolite; amphibolites, garnet amphibolites, quartzites, garnet-biotite gneisses, biotite-muscovite gneiss-granites, porphyroblastic gneisses, metasandstones, metasiltstone (aleurolites), metavolcanites, marbles. Thickness 3500m.

Lithology Pattern:

Gneiss

Relationships and Distribution

Lower contact

Contacts are tectonic.

Upper contact

Contacts are tectonic.

Regional extent

Eastern part of the Sultanuzdag Ridge. Correlated with metamorphic formations of the basement in the Tamdytau Mountains (Uchkuduktau Fm), S. Nuratau (Majerum Fm), Ziaetdin (Katarmai Fm),

GeoJSON

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Fossils

Pelitomorphic limestones with fauna from the lower-middle Devonian, which are probably tectonic wedges and scales, have been excluded from the composition of these suites. Previously, some researchers (458; 508; Kulesh et al., 1974; Keshishyan et al., 1983, etc.) believed that a continuous section of Silurian, Devonian, and Carboniferous deposits was preserved Here; others (73; 474; O.I. Kim et al., 1976; Mikhailov, 1988) describe Sultanuzdag Gr as a system of lenticular tectonic scales, which explains the alternation of metamorphic rock bands with bands of weakly metamorphosed rocks.

Age

The provisional Proterozoic age of the series is justified by its correlation with metamorphic formations of the basement in the Tamdytau Mountains (Uchkuduktau Fm), S. Nuratau (Majerum Fm), Ziaetdin (Katarmai Fm), high degree of metamorphism, and absolute age data (potassium-argon method) - Uruksay Fm - 776 million years (amphibole), 446-449 million years (biotite); Dzhamansay Fm - 823 million years (amphibole); Sultanuzdag Fm - 780 million years (amphibolite) (73; 474, O.I. Kim et al., 1976). G.Yu. Alferov (458), A.A. Kulesh (1974), S.S. Shulz (Jr.) (508), K.A. Keshishyan et al. (1983, 1995) include weakly metamorphosed carbonate rocks containing numerous fauna in the section of the series and date its age within the late Silurian-late Devonian.

Age Span:

Beginning stage:

Statherian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

1,800.00

Ending stage:

Pragian

Fraction up in the ending stage:

1.0

Ending date (Ma):

410.51

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)”