Seminar

The Himalaya mark a unique setting to study and understand the dynamic interactions between plate tectonics and Earth’s surface environment. Here I will present new bedrock and detrital zircon (U-Th)/He thermochronometric data that directly constrains the exhumational evolution of the Lesser Himalaya of northwest India and elucidates the relationship between regional weathering of isotopically unique Himalayan source rock and observed shifts in Neogene global 187Os/188Os and 87Sr/86Sr seawater records. While these seawater records are commonly utilized as deep-time proxies to track global silicate weathering, our data provides compelling evidence that compositional shifts in weathering substrate drive these records independently of shifts in global silicate weathering, thus hindering the utility of these records.