Summer Field in the Gianbul Valley, India

During August and September, Jeff Lee and new graduate student Meilani Bowman-Kamahaho’a traveled to India to undertake field research of the Gianbul Dome, in the northwest Himalaya. The goals of the nearly 6-week long trip were to collect mesoscopic structural and kinematic data from middle crustal rocks, and document the relative timing of deformation recorded in these rocks and intrusive events. One hundred thirty kg of rocks were collected for detailed microstructural kinematic, vorticity, and deformation temperature analyses, and U/Pb geochronology and Ar/Ar and (U-Th)/He thermochronometry studies. The goals of this National Science Foundation funded project are to document the deformational patterns recorded in these middle crustal rocks to test whether these rocks record evidence for mid-crustal channel flow, the mechanisms by which this dome formed, and the timing of deformation and exhumation of the dome.

Camp Himalayan Range: Camp site on the south side of the Himalayan Range

Asymmetric boudins: Meilani points out asymmetric pegmatite boudins

Headwaters of the Gianbul Valley: View to west of the headwaters of Gianbul Valley, Himalayan Range

Lunch: Meilani and guides/field assistants Raju and Tenzing eating lunch on the outcrop