Journal
EPISODES
Volume 43, Issue 1, Pages 346-357Publisher
GEOLOGICAL SOC KOREA
DOI: 10.18814/epiiugs/2020/020021
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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 similar to 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) along the Main Central Thrust (MCT), while early Paleozoic detrital zirconhas first appearance in tectonically overlying Tethyan Himalayan Sequence (THS). The iLH sediments were possibly derived both from a northernly similar to 1.9 Ga magmatic arc and the Archean-Proterozoic Aravalli-Bundelkhand nuclei of the Indian craton. Source rocks for Neoproterozoic zircon in the GHS-a distinct terrane in the Himalaya-may possibly be the Neoproterozoic magmatic bodies within the GHS and 'In-board' Aravalli-Delhi Fold Belt (ADMB)-Central Indian Tectonic Zone (CITZ), though northern 'Off-board' sources cannot be ruled out, altogether.
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