Zircon U‐Pb Age Constraints on NW Himalayan Exhumation From the Laxmi Basin, Arabian Sea

The Indus Fan, located in the Arabian Sea, contains bulk of sediment eroded from Western Himalaya and Karakoram. Scientific drilling Laxmi Basin by International Ocean Discovery Program (IODP) recovered a discontinuous erosional record for River drainage dating back to at least 9.8 Ma, with single sample 15.6 Ma. We dated detrital zircon grains U-Pb geochronology reconstruct how erosion patterns changed through time. Long-term increases components 750–1200 Ma 1500–2300 increasing preferential relative Karakoram between 8.3–7.0 5.9–5.7 average contribution Karakoram-derived Fan fell 70% total 35% 5.9 5.7 An increase zircons starting 2.5 1.6 indicates significant unroofing Inner Lesser (ILH) that trend age spectra is consistent Nd isotope data. initial change spatial 7.0–5.9 occurred during time drying climate foreland. ILH postdated onset dry-wet glacial-interglacial cycles suggesting some role control. However, driven rising topography response formation thrust duplex, especially Pliocene, also played an important role, while influence Nanga Parbat Massif flux was modest.