Crustal configuration in northwestern Himalaya from gravity measurements along Kiratpur-Leh-Panamik transect

TitleCrustal configuration in northwestern Himalaya from gravity measurements along Kiratpur-Leh-Panamik transect
Publication TypeJournal Article
Year of Publication2003
AuthorsBanerjee P, Satyaprakash W
JournalJournal of the Geological Society of India
Volume61
Pagination529-539
Date PublishedMay
ISBN Number0016-7622
Accession NumberWOS:000182686500003
Abstract

Detailed gravity measurements were carried out along Kiratpur-Manali-Leh-Panamik transect. Starting from the foreland basin in the south, this 550 km long transect cuts across the entire section of the NW Himalaya, and teaches the southern foothills of the Karakorum range, in Ladakhh. With GPS aided positioning, and exhaustive terrain correction applied using a digital elevation model, the data presented here are the most accurate and detailed gravity data ever published from the Himalaya. A broad regional isostatic gravity high aligned along the central axis of the Himalayan arc suggests domal upwarping of the converging Indian crust under the compression,of collision. A series of prominent gravity highs over the Indus Tsangpo Suture Zone and over the Ladakh batholith, are indicative of the presence of ultrabasic rocks which are not otherwise exposed at the surface. A sharp decline of Bouguer gravity associated with a 4 m drop of geoid undulation, 50 kin north of the Indus river near Leh confirms the presence of a low-density layer at around 20 km depth, which might have originated due to partial melting of the underlying continental crust.