Terrane characterization in the Himalaya since Paleoproterozoic

Abstract

In the Himalaya, distinct terranes are juxtaposed across the Main Central Thrust Zone (MCTZ) where subthrust Inner Lesser Himalaya (iLH) sedimentary belt yielded nearly unimodal U-Pb detrital zircon (DZ) between 2.05 and 1.80 Ga. Within this thrust zone, orthomylonite and other lithologies represent the Proterozoic magmatic arc with zircon having U-Pb ~1.95 to 1.89 Ga crystallization ages; together, these represent the Columbian Supercontinent assembly. In contrast, first appearance of the Neoproterozoic 1.05-0.85 Ga zircon characterizes the overthrust Great Himalayan Sequence (GHS-Vaikrita Group)

Topics & Concepts