Overt and Cryptic Strongly Potassic Mafic Liquids in the Neogene Magmatism of the Northernmost Part of the Rio Grande Rift, USA: A Lithospheric Drip-Feed into a Asthenospheric-source Magmas? - Thompson, R.N.; Gibson, S.A.; Leat, P.T. (International Kimberlite Conference: Extended Abstracts, 1991)