Ultrapotassic Magmas along the Flanks of the Oligo-Miocene Rio Grande Rift, USA: Monitors of the Zone of Lithospheric Mantle Extension and Thinning Beneath a Continental Rift - Gibson, S.A.; Thompson, R.N.; Leat, P.T.; Morrison, M.A.; Hendry, G.L.; Dickin, A.P. (International Kimberlite Conference: Extended Abstracts, 1991)