Source provenance
Searle, M.P. (2011). Geological evolution of the Karakoram Ranges. Italian Journal of Geosciences, 130(2), 147-159.
Cited by 2 units (2 published) · 0 field-level citations · 2 revision notes.
FULL TEXT REVIEWED (reviewer-supplied). Review of the Karakoram terrane (geologically equivalent to the Qiangtang terrane of Tibet). Above sea level since Early-Mid Cretaceous (age of the youngest marine sediments); Late Jurassic to Mid-Cretaceous north-dipping subduction of Tethyan lithosphere produced widespread Andean I-type granite-granodiorite magmatism (Hunza, Hushe plutonic units) with Buchan-type low-pressure metamorphism; Kohistan intra-oceanic arc developed to the south (Aptian-Eocene, ~120-45 Ma); India-Asia collision ~50 Ma, followed by crustal thickening and the Miocene axial Baltoro leucogranite. DOI to confirm (Italian Journal of Geosciences, same 2011 issue as Zanchi & Gaetani).
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Units citing this source
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- Age: Corroborated by Searle (2011) and Rex et al. (1988): the Baltoro Granite is the Miocene axial post-collisional leucogranite of the Karakoram batholith, emplaced during crustal thickening after the India-Asia collision. Consistent with the recorded Miocene (25-12 Ma) age.
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- Geological significance: Corroborated by Rex et al. (1988) and Searle (2011): the Hunza Plutonic Unit is part of the Karakoram batholith, an Andean-type (I-type, calc-alkaline) suite generated by Late Jurassic to Mid-Cretaceous north-dipping subduction of Tethyan oceanic lithosphere beneath the Karakoram, pre-dating the ~50 Ma India-Asia collision. Consistent with the recorded mid-Cretaceous (~105 Ma) subduction-related setting.