Geochemistry of rocks from volcanic-plutonic associations at the Karamken gold-silver deposit, Russian northeast

New data on the trace element distribution in rocks of volcanic-plutonic as sociations from the vicinity of the Karamken gold-silver deposit are report ed. The deposit is localized in the outer zone of the Cretaceous Okhotsk-Ch ukotka volcanic belt. The locally widespread Cretaceous calc-alkaline rocks compose a continuous series from high-alumina basalt to rhyolite. The Pale ogene lamprophyre dikes are derivatives of alkali picrite magma. The distri bution of major and trace elements in the rocks and correlations between el ements indicate that the primary magma fractionation was the principal petr ogenetic process. The early mineral assemblages of basalt and andesite crys tallized from dry deep-seated melts, whereas the late assemblages are the p roducts of water-rich magma crystallization in shallow-seated chambers. The diorite porphyry and related breccia that hosts the Au-Ag mineralization a re considered in detail.