The Location and Extent of Volcanic Massive Sulphide and Manto-Type Copper Deposits in the Cretaceous Volcanic Arcs in the Peruvian Andes

摘要

Cretaceous volcanic activity (Hauterivian Albian) in the Peruvian Andes can be found along the coast of Peru and the western edge of the Andes mountains between 15deg30'S and 5deg30'S, extending discontinuously in south to Chile and north to Ecuador and Colombia. This volcanic activity formed in three aborted martinal basins; the NNW-trending volcanic Canete and Huarmey, and NNE-trending Lancones basins. These volcanic rocks are predominantly andesitic and basalitc in composition, of calc-alkaline and tholeiite affinity with subordinate dactic and rhyolitic rocks. One notable feature is the appearance of "ocoitas"~+ from Ica (14degS) south to Santiago de Chile. These rocks have a calc-alkaline to alkaline affinity.