EXPLOSIVE SUBAQUEOUS VOLCANISM

By O. GIUNU

INTRODUCTION …………………………………………………… 1 THE DURATION OF MAGMATISM AND HYDROTHERMAL ACTIVITY IN THE YANACOCHA DISTRICT, NORTHERN PERÚ29 YANACOCHA STRATIGRAPHY122 Geochemical Variations with Time in the Cenozoic Yanacocha Volcanic Field, Cajamarca Province, Northern Perú 173 CONCLUSIONS 335