Precambrian • Paleoproterozoic GSP memoir

Iskere Gneiss

Paleoproterozoic (~1850 Ma)

Cited in 3 sources Last reviewed Jul 30, 2026

Unit summary

Rank: Not recorded
Status: Published
Age: Precambrian · PaleoproterozoicPaleoproterozoic (~1850 Ma)
Named by: Not recorded
Type locality: Iskere village, Nanga Parbat, Gilgit-Baltistan
Thickness: 1500+ m
Lithology: Augen gneiss, biotite-muscovite gneiss, migmatite
Synonyms: Not recorded

A Palaeoproterozoic augen gneiss and migmatite unit of the Nanga Parbat massif near Iskere village, representing reworked Indian-plate crystalline basement with K-feldspar augen texture and intruded by Tertiary leucogranites.

Named after Iskere village in the Nanga Parbat massif. Represents reworked Indian Plate basement with characteristic augen texture from K-feldspar porphyroclasts. Intruded by Tertiary leucogranites.

Fossils

Not recorded

Contacts

In the Nanga Parbat Massif column

MetamorphicContact 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

Nanga Parbat Massif Indo-Pakistan Shield

Basin: Not recorded
Region: Not recorded
Depositional environment: Not recorded
Coordinates: Not recorded

Correlation

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

Economic significance

Not recorded

Remarks

Regarded as one of the older basement components of the Nanga Parbat-Haramosh massif (Palaeoproterozoic orthogneiss); records long-lived reworking of Indian-plate basement subsequently overprinted by Himalayan metamorphism and leucogranite intrusion.

Research notes (2)

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)

Kazmi & Jan (1997): the Iskere Orthogneiss yields a 1850 Ma zircon date (Zeitler et al. 1989), interpreted as a deformational, thermal and magmatic event (Treloar et al. 1990b) that was regionally widespread — comparable Ar/Ar ages of 1887–1865 Ma at Besham (Baig 1990) and a 1820 ± 130 Ma Rb–Sr date from Kumaon (Valdiya 1988). This corroborates the curated ~1850 Ma (Paleoproterozoic) age.

Kazmi, A.H. & Jan, M.Q. (1997)

Geological significance (1)

Kazmi & Jan (1997): the Iskere Orthogneiss is a core unit of the Nanga Parbat Group; it is tectonically overlain (Madin et al. 1989) by the Shingus Gneiss — or, per Treloar et al. (1991b), forms the basement to it — and in the Haramosh region is overlain by the Haramosh Schist (amphibolite-grade biotite schist/gneiss, marble, calc-silicate gneiss and amphibolite).

Kazmi, A.H. & Jan, M.Q. (1997)

Sources (2)

Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
Kazmi, A.H. & Jan, M.Q. (1997). Geology and Tectonics of Pakistan. Graphic Publishers, Karachi.

Reviewer confidence: medium

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: Appears in a single-author Geological Survey of Pakistan memoir (Malkani & Mahmood 2017), not cross-confirmed against the Shah lexicon. The Stratigraphic Committee of Pakistan is largely inactive, so documented provenance — not formal ratification — is the available signal.

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Cite this unit

APA

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

BibTeX

@misc{stratigraphypk_iskeregneiss,
  author    = {Qudsi, Lareb},
  title     = {{Iskere Gneiss} --- 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/iskere-gneiss (accessed October 29, 2026).

Below · older

Shingus Gneiss

Paleoproterozoic

Above · younger

Nanga Parbat Gneiss

Mesoproterozoic