Pleistocene melting and rapid exhumation of the Nanga Parbat massif, Pakistan: Age and P-T conditions of accessory mineral growth in migmatite and leucogranite

Details Pleistocene melting and rapid exhumation of the Nanga Parbat massif, Pakistan: Age and P-T conditions of accessory mineral growth in migmatite and leucogranite Pleistocene melting and rapid exhumation of the Nanga Parbat massif, Pakistan: Age and P-T conditions of accessory mineral growth in migmatite and leucogranite

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26psl.288..408c&link_type=abstract

Earth and Planetary Science Letters, Volume 288, Issue 3-4, p. 408-420.

Computer Science

1

Scientific paper

Rapid Pleistocene exhumation of the core of the Nanga Parbat massif (northwestern Himalayan syntaxis) is inferred by combining U-Pb dates from monazite, xenotime, and zircon from migmatitic rocks and a leucogranite dike with pressure estimates that are closely linked to dated events in the melting and crystallization history. Exhumation rates of ˜ 11-13 mm/a were calculated from (i) migmatitic rocks that were produced at ˜ 1.7 Ma and 5.0 kbar by dehydration melting of biotite on decompression and (ii) veins with garnet and cordierite that crystallized at ˜ 1.0 Ma and 3.5 kbar. Tourmaline-bearing leucogranitic dikes separated from the source and ascended to crystallize near their solidus at ˜ 0.7 Ma. Modeling of Th/U in the leucogranite magma based on Th/U and U-Pb data from monazite, xenotime, and zircon shows a decrease from 1.1 to 0.2 over a span of 0.15 Ma. The implied acceleration of exhumation at ˜ 1.7 Ma may be linked to mid-crust flow as the evolving thermal structure of the Neogene metamorphism encountered the biotite dehydration-melting reaction. The rapid exhumation may have resulted from significant lowering of the effective viscosity of mid-crustal rocks, leading to vertical channel flow into the core of the Nanga Parbat massif along bounding shear zones.

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