Age of crustal melting and leucogranite formation from U-Pb zircon and monazite dating in the western Himalaya, Zanskar, India

New U-Pb data from leucogranites in the High Himalayan slab in the western Himalaya of Zanskar reveal that crustal melting occurred at 21-19.5 Ma and that anatexis occurred along the Himalaya at least from Kashmir-Zanskar to eastern Nepal at ∼24-19.5 Ma. High-U monazites from leucogranitic melt pods...

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Bibliographic Details
Published in:Geology (Boulder) 1995-12, Vol.23 (12), p.1135-1138
Main Authors: Noble, S. R, Searle, M. P
Format: Article
Language:English
Subjects:
absolute age
anatexis
Asia
Cenozoic
continental crust
crust
dates
Doda India
genesis
geochronology
Geological time
granites
Himalayan Orogeny
Himalayas
igneous rocks
India
Indian Peninsula
Jammu and Kashmir
Kishtwar India
leucogranite
melting
metamorphic rocks
middle Tertiary
migmatites
Minerals
monazite
Mountains
nesosilicates
orthosilicates
phosphates
plutonic rocks
Shafat India
silicates
slabs
Tertiary
U/Pb
Zanskar
zircon
zircon group
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Summary:New U-Pb data from leucogranites in the High Himalayan slab in the western Himalaya of Zanskar reveal that crustal melting occurred at 21-19.5 Ma and that anatexis occurred along the Himalaya at least from Kashmir-Zanskar to eastern Nepal at ∼24-19.5 Ma. High-U monazites from leucogranitic melt pods in migmatites within the 35-km-wide sillimanite + K-feldspar zone at the deepest structural levels exposed (Umasi-la) have U-Pb ages of 20.6-19.5 Ma. Higher-level migmatitic melt pods from Shafat in the Suru valley also contain magmatic monazites with U-Pb ages of 20.8±0.3 Ma. Zircons from the leucogranites contain an ∼460 Ma inherited component, as do some Umasi-la monazites, showing that the protoliths were at least Ordovician in age.
ISSN:0091-7613
1943-2682
DOI:10.1130/0091-7613(1995)023<1135:AOCMAL>2.3.CO;2