The Basalt of Patagonia

The samples subjected to the microscopic examination and chemical analysis were provided by the 4th Scientific Expedition to Patagonia by Hiroshima & Hokkaido Univ., 1969. The party collected them on the continental side of the southern Andes between Mendoza and Santa Cruz in Argentina. The present writers tried in the first place to clarify the order of eruption, in the second place to define the petrological and chemical properties of the basalts, and at last some genetic considerations were pursued.