Source provenance
Zeitler, P.K., Sutter, J.F., Williams, I.S., Zartman, R. & Tahirkheli, R.A.K. (1989). Geochronology and temperature history of the Nanga Parbat-Haramosh Massif, Pakistan. In: Malinconico, L.L. & Lillie, R.J. (eds) Tectonics of the Western Himalayas. Geological Society of America Special Paper 232, 1-22.
Cited by 1 unit (1 published) · 0 field-level citations · 2 revision notes.
Geochronology of the Nanga Parbat-Haramosh Massif (NPHM). Peak metamorphism 25-30 Ma (Ar/Ar hornblende). U/Pb zircon protolith ages: Iskere Gneiss ~1850 Ma, structurally lower Shengus Gneiss 400-500 Ma (possibly a metamorphosed Mansehra Granite / Paleozoic S-type equivalent). Iskere zircon rims 2.3-11 Ma show the metamorphism is Tertiary, not Precambrian. Post-metamorphic cooling controlled over the last 5-10 Ma by the Raikhot Fault plus passive uplift beneath the overthrust Kohistan arc; net cooling rates accelerated from ~20 C/Ma at ~20 Ma to ~300 C/Ma at 0-0.4 Ma.
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- Age: Zeitler et al. (1989): U/Pb zircon dating gives protolith ages of ~1850 Ma for the Iskere Gneiss and 400–500 Ma for the structurally lower Shengus Gneiss (which may be a metamorphosed equivalent of the Mansehra Granite and other Paleozoic S-type Himalayan granites). Critically, thin high-U zircon rims on the Iskere Gneiss yield 2.3–11 Ma ages, showing that the high-grade metamorphism of the massif is TERTIARY, not Precambrian — the curated Precambrian age applies to the protolith, not the metamorphic fabric.
- Geological significance: Zeitler et al. (1989): the Nanga Parbat–Haramosh Massif — a north-pointing promontory of Indian-plate high-grade gneiss at the northwestern Himalayan syntaxis — reached peak metamorphic temperatures at 25–30 Ma. Its post-metamorphic cooling over the last 5–10 Ma has been controlled by the Raikhot Fault together with passive uplift beneath the overthrust Kohistan arc; net cooling rates for gneisses now at the Indus River accelerated from ~20 °C/Ma at ~20 Ma to ~300 °C/Ma at 0–0.4 Ma, recording extraordinarily rapid recent exhumation.