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The Main Central Thrust shear zone is the dominant crustal thickening feature in the Himalayas, largely responsible for the extreme relief and mass wasting of the range. Along the Bhagirathi River in NW India, the Main Central Thrust is several kilometers thick and separates high-grade gneisses of the Greater Himalayan Crystallines from Lesser Himalayan metasedimentary rocks. Th-Pb ion microprobe ages of monazite dated in rock thin section from the Greater Himalayan Crystallines are Eocene (38.0 ± 0.8 Ma) to Miocene (19.5 ± 0.3 Ma), consistent with the burial of the unit during imbrication of the northern Indian margin and subsequent...

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