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Presented By: Earth and Environmental Sciences

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Smith Lecture: Matthew Kohn

Himalayan leucogranites – small volume melts with large tectonic and economic potential

A group of eight people are posing together on a dirt path in a rugged, mountainous landscape. They are dressed in casual hiking clothes, with some wearing hats or bandanas, indicating they are on an outdoor adventure. Behind them, steep rocky cliffs rise to the left, and the scene opens to a vast valley and distant hills under a cloudy sky. The ground is dry and covered with sparse grasses and shrubs. A group of eight people are posing together on a dirt path in a rugged, mountainous landscape. They are dressed in casual hiking clothes, with some wearing hats or bandanas, indicating they are on an outdoor adventure. Behind them, steep rocky cliffs rise to the left, and the scene opens to a vast valley and distant hills under a cloudy sky. The ground is dry and covered with sparse grasses and shrubs.
A group of eight people are posing together on a dirt path in a rugged, mountainous landscape. They are dressed in casual hiking clothes, with some wearing hats or bandanas, indicating they are on an outdoor adventure. Behind them, steep rocky cliffs rise to the left, and the scene opens to a vast valley and distant hills under a cloudy sky. The ground is dry and covered with sparse grasses and shrubs.
Leucogranites (highly felsic intrusive bodies with <3% Fe-Mg minerals) represent small fractions of granitic rocks overall, but often have unusual chemistries and structural settings. The Himalayan leucogranites are the most well-studied worldwide, are abundant at the crest of the Himalaya, and are associated with Earth’s largest continental normal fault system– the South Tibetan Detachment System (STDS). These sheet-like bodies have crystallization ages from ≤~15 to ~24 Ma, range from undeformed to highly sheared, and have newly-discovered economic resources, especially in Li (spodumene) and Be (beryl), but also Nb-Ta, and W-Sn. Trace element and isotope geochemistry link Himalayan leucogranites to partial melting of underlying, high-grade metamorphic rocks of the Greater Himalayan Sequence (GHS).
A group of eight people are posing together on a dirt path in a rugged, mountainous landscape. They are dressed in casual hiking clothes, with some wearing hats or bandanas, indicating they are on an outdoor adventure. Behind them, steep rocky cliffs rise to the left, and the scene opens to a vast valley and distant hills under a cloudy sky. The ground is dry and covered with sparse grasses and shrubs. A group of eight people are posing together on a dirt path in a rugged, mountainous landscape. They are dressed in casual hiking clothes, with some wearing hats or bandanas, indicating they are on an outdoor adventure. Behind them, steep rocky cliffs rise to the left, and the scene opens to a vast valley and distant hills under a cloudy sky. The ground is dry and covered with sparse grasses and shrubs.
A group of eight people are posing together on a dirt path in a rugged, mountainous landscape. They are dressed in casual hiking clothes, with some wearing hats or bandanas, indicating they are on an outdoor adventure. Behind them, steep rocky cliffs rise to the left, and the scene opens to a vast valley and distant hills under a cloudy sky. The ground is dry and covered with sparse grasses and shrubs.

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