Cenozoic • Paleogene group Literature

Shamran Volcanic Group

Eocene (Shamran volcanics c. 58 Ma, Western Volcanics c. 61 Ma; post-suturing)

Kohistan Arc · Northern Greenstone Belt

Cited in 3 sources Last reviewed Jul 30, 2026

Unit summary

Rank: group
Status: Published
Age: Cenozoic · Paleogene · Paleocene-EoceneEocene (Shamran volcanics c. 58 Ma, Western Volcanics c. 61 Ma; post-suturing)
Named by: Treloar et al. (1996)
Type locality: Shamran area, Kohistan.
Thickness: Not recorded
Lithology: Highly evolved calc-alkaline volcanics spanning basaltic andesite to rhyolite with strong LILE enrichment and high LILE/HFSE; includes the bimodal Western Volcanics and the Shamran and Drosh volcanics.
Synonyms: Not recorded

The Shamran Volcanic Group is an Eocene, post-suturing suite of highly evolved calc-alkaline volcanic rocks in Kohistan, including the Western Volcanics; it records mature Andean-type continental-margin volcanism during renewed extension (fore-arc collapse) at c. 58-40 Ma. On the revised map the formerly-'Chalt' Western Volcanics are reassigned to this group.

Fossils

Not recorded

Contacts

In the Kohistan Arc column

MetamorphicIgneousShale / mudFossils recordedContact not recorded

Band colour = period; texture = dominant rock type. Lines between bands mark the contact type; dotted = no contact recorded in the sources (not a claim of conformity). True scale makes height ∝ recorded thickness; hatched = thickness not recorded. Ages approximate, for ordering.

This unit (highlighted) within its province column; faded ends continue above and below. Line style marks the contact type.

Distribution & setting

Kohistan Arc

Basin: Kohistan Arc
Region: Northern Greenstone Belt
Depositional environment: volcanic-arc, continental
Coordinates: Not recorded

Correlation

Not recorded. Compare this unit against other basins on the correlation panel →

Economic significance

Not recorded

Remarks

Post-suturing Andean-type arc volcanism (c. 58-40 Ma); separated on the revised map from the older, pre-suturing Chalt Volcanic Group with which it had been mapped, and correlated with the Utror, Mankial and Drosh volcanics.

Research notes (1)

Field-by-field findings drawn from the cited literature. Every statement is traced to a registered source — follow a citation for the full reference.

Age & correlation (1)

Petterson (2010): the Shamran (Shamran/Teru) Volcanic Group is a post-suturing, highly evolved calc-alkaline volcanic-sedimentary unit of the Kohistan arc, younger than the intra-oceanic Chalt Volcanic Group. Primary review source for the Shamran/Teru succession.

Petterson, M.G. (2010)

Sources (1)

Treloar, P.J., Petterson, M.G., Jan, M.Q. & Sullivan, M.A. (1996). A re-evaluation of the stratigraphy and evolution of the Kohistan arc sequence, Pakistan Himalaya. Journal of the Geological Society, London, 153, 681-693.

Every fact on this page is source-cited. This entry is part of the peer-archived Pakistan Stratigraphy Dataset (doi.org/10.5281/zenodo.21363991, CC‑BY‑4.0).

Lexicon status: Defined in journal or other literature; not found in a GSP memoir. There is no body currently ratifying unit status, so provenance is shown in place of a formal ruling.

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Cite this unit

APA

Qudsi, L. (2026). Shamran Volcanic Group. In Pakistan Stratigraphy Dataset [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21363991

BibTeX

@misc{stratigraphypk_shamranvolcanicgroup,
  author    = {Qudsi, Lareb},
  title     = {{Shamran Volcanic Group} --- Pakistan Stratigraphy Dataset},
  year      = {2026},
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.21363991},
  url       = {https://doi.org/10.5281/zenodo.21363991}
}

Archived dataset: doi.org/10.5281/zenodo.21363991 (CC‑BY‑4.0) · Direct link to this entry: https://stratigraphy.pk/formation/shamran-volcanic-group (accessed October 29, 2026).

To cite the unit's original definition instead, see: Treloar et al. (1996).