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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Zvordarin Formation

Zvordarin Fm

Period:

Proterozoic

Age Interval:

Neoproterozoic (PR₁? zv), R1

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

The concept of the primary sedimentary origin of this suite and its affiliation with the Alichur Gr is controversial. S. I. Klyunnikov (1935a) attributed these rocks to intrusive formations. This is the uppermost formation in Alichur Gr.

Synonym: Zvordarin Suite, zвордаринская свита

Reference section:

Lithology and Thickness

It is represented by a uniform thickness of poly migmatites, among which melanocratic biotite and amphibole-biotite varieties, as well as leucocratic biotite and muscovite varieties are found. The incomplete thickness of the suite is 2000 m.

According to V. I. Budanov's observations, these are rocks of the endocontact zone of the Zvordarin granitic massif, and possibly an additional phase of it. This is evidenced by the similarity of the chemical and mineral compositions of migmatites and granitoids, the presence of relics of magmatic structures (hygiid euhedral-granular, monzonitic) in migmatites, relics of foliated lamprophyre dikes, and hornfels xenoliths. The intense foliation of migmatites, their protoclasic to cataclastic structures, are explained by V. I. Budanov as the formation of the marginal part of the Zvordarin massif in a zone of intense movements under conditions of a plastic state of matter.

Lithology Pattern:

Granitic

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Lyangar Fm

Upper contact

Schematic stratigraphic column indicates the upper contact as Alichur Gr

Regional extent

It is developed in the Southwestern Pamir- Rushan, Alichur, and Wakhan ranges. It is separated from the surrounding rocks everywhere by breaks and granitic masses, and only in the upper reaches of the Patkhor River, according to V. P. Bulin, formations of the Lyangar Fm are in agreement with it.

GeoJSON

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Fossils

Age

Neoproterozoic

Age Span:

Beginning stage:

Cryogenian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

720.00

Ending stage:

Ediacaran

Fraction up in the ending stage:

0.8

Ending date (Ma):

558.04

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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