Acknowledgments

M.A. Forster acknowledges the support of an Australian Research Fellowship provided by the Australian Research Council (ARC) associated with the Discovery grants DP0877274, and additional support from the Research School of Earth Sciences at The Australian National University (ANU). 40Ar/39Ar analysis was done in the Argon Geochronology Facility at ANU. Irradiation of the sample was done at McMaster Reactor, Canada. The eArgon software used in the paper was written by G.S. Lister. G.S. Lister is gratefully acknowledged for fieldwork initiation and involvement as well as vital discussion. Discussion with J. Aitchison greatly appreciated. T. Ireland gave support for SHRIMP analysis at ANU. Jia-Urnn Lee undertook SEM white mica analysis at EMU, ANU. Support in Ladakh from Dr. C.P. Dorjey is gratefully acknowledged. The paper is much improved by the two reviewers A. Camacho and J. Aitchison.