Goran Gr

Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

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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Goran Gr

Period:

Archean

Age Interval:

Eoarchean (AR? Gr), Sh1

Province:
SE Tajik (SW Pamir)

Type Locality and Naming

Includes in Shadarlan and Schugnan ranges.

It was distinguished by B. Ya. Khoreva and K. T. Budanova (1965); it corresponds to the previously distinguished Goranokaya suite by V. P. Bulin. The Goran Gr is the oldest in the Southwestern Pamir.

Synonym:

Reference section:

Lithology and Thickness

The series is represented by biotite, amphibole-biotite, and sillimanite-biotite gneisses, as well as quartzites and migmatites. Its incomplete thickness is 4000 m.

The Goran Gr differs from the younger Shakhdarin Gr by the presence of quartzite interlayers and magnesite marbles, forming interlayers up to 500 m thick, and the sharply subordinate role of alumina gneisses (with garnet and disthene), which are widely distributed in the Shakhdarin Gr. It is worth noting the presence in the Goran Gr of the following rocks, important for assessing the degree of its metamorphism: lenses of eclogite-like garnet-diopside-plagioclase rocks, lenses of interlayers of para- and orthoamphibolites, magnesian skarns with spinel, lazurite, sapphirine, corundum, forsterite, and enstatite. The stratigraphic section of the Goran Gr is probably three-membered (as assumed from data of individual cross-sections). The lower part (over 1000 m) is composed of quartzites and quartzose gneisses containing interlayers of marbles. The middle part (500 m) contains interbedded marbles and gneiss; the upper (over 1000 m) - quartzites, marbles, and gneisses.

Lithology Pattern:

Gneiss

Relationships and Distribution

Lower contact

However, B. Ya. Khorova (1971), noting the seemingly conformable deposition of the Khoreg suite on the Goran Gr, finds the nature of the contact unclear, pointing out the overlying of the Khoreg Fm on different parts of the Goran Gr section. V. I. Budanov and K. T. Budanova consider this contact to be tectonic (as mentioned below).

Upper contact

It is overlain without apparent unconformities by the Khoreg Fm, which begins the section of the following Shakhdarin Gr.

Regional extent

It is widespread in the Southwestern Pamir. The Goran Gr is the oldest in the Southwestern Pamir.

GeoJSON

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Fossils

Age

Eoarchean

Age Span:

Beginning stage:

Eoarchean

Fraction up in beginning stage:

0.0

Beginning date (Ma):

4,000.00

Ending stage:

Eoarchean

Fraction up in the ending stage:

1.0

Ending date (Ma):

3,600.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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