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Carboniferous

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Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

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Kalaykhumb Formation

Kalaykhumb Fm

Period:

Carboniferous

Age Interval:

Tournaisian – Visean (C₁ kl), D1

Province:
SW Tajik

Type Locality and Naming

It is delineated by N.G. Vlasov and I.V. Pyzyanov (Vlasov, 1961).

Synonym: Kalaykhumb suite (Калайхумбская свита), Kalaikhumb Fm,

Reference section:

Lithology and Thickness

The suite is composed of greenstone diabases and pyroxene-plagioclase porphyrites. In interlayers and lenses, serpentinites, albite-phires, polymict sandstones, clay shales, limestones, and conglomerates are encountered. The thickness of the suite is 1000-1300 m.

In the lower part of the Kalaykhumb Fm, there are limestones, conglomerates, claystones, and greywacke sandstones up to several hundred meters in thickness. N. G. Vlasov believes that they are developed locally and replaced by greenstone, effusive-fragmented rocks in strike.

Lithology Pattern:

Volcanic_ash

Relationships and Distribution

Lower contact

It transgressively lies on the Dikzankou Fm

Upper contact

It is overlain conformably by the Serpukhovian stage volcanics, beginning with the Aspandou Fm.

Regional extent

It is widespread in the Darvaz region.

GeoJSON

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Fossils

In the lenses of limestones in the lower part of the Kalaykhumb Fm, remains of Tournaisian foraminifers Carbonella cf. spectabilis Dain, Tournayella aff. minuta Lip.; rugose corals Siphonophyllia cylindrica Scoul., Caninia cornucopinae Mich., Campophyllum cf. caninoides Volkova and others are contained. Higher up, numerous Viséan foraminifers are found. Archaediscus moelleri Raus. et Reit1., Mediocris mediocris (Viss.), Plectogyra ex gr. omphalota Raus. et Reitl.; rugose corals Dibunophyllum turbinatum McCoy, Lithostrotion junceum Flem., Palaeosmilia murschisoni Edw., et H., Aulophyllum ex gr. fungites Flem.; brachiopods Semiplanus Semiplanus (Schwetz.), Davisiella comoides (Sow.), Gigantoproductus aff. striatosulcatus (Schwetz.), G. sarsimbaii (Serg.).

Age

Based on the aforementioned remains, as well as by lying under the early Serpukhovian Aspandous Fm (аспандоуокой свитой), the Kalaikhumb suite is attributed to the Tournaisian – Visean

Age Span:

Beginning stage:

Tournaisian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

359.30

Ending stage:

Visean

Fraction up in the ending stage:

0.5

Ending date (Ma):

338.54

Depositional setting

Depositional pattern:

Additional Information

N. G. Vlasov believes that they are developed locally and replaced by greenstone, effusive-fragmented rocks in strike. According to I. V. Pyzyanov (1964, 1965), such replacement is absent, therefore he proposed to separate the lower carbonate-terrigenous rocks into an independent Khrstardin Fm (хырсдаринскую свиту), and the overlying volcanic rocks into the Obimangit Fm (обиманrитскую свиту). The age of the former (according to I. V. Pyzyanov) is Turonian-Visean, the latter is Serpukhovian (since the limestones with remains of lower Serpukhovian goniatites are attributed by I.V. Pyzyanov to the Obimangit Fm, and not to the Aspandous Fm, as N. G. Vlasov believes).

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Lakhsh district, 276.