Home – Home – Jornals – Russian Geology and Geophysics 2002 number 9

We present results of detailed mineralogical and geochemical investigations of peridotites from allochthonous plate in Rakovaya Bay (the north of Avachinskaya Bay, Eastern Kamchatka). In geologic position and composition the studied rocks are much similar to ultramafic rocks of other massifs of the East Kamchatkan ophiolite belt and <%-2>are referred to as restite peridotites of the so-called suprasubductional type transformed by multistage metamorphism. It is suggested that peridotites of Rakovaya Bay along with ultramafic rocks of the Ganal'sky Ridge and ultrabasic xenoliths of the Avachinsky Volcano form a linear NW-oriented zone, which spatially coincides with the Avacha-Kolpakova zone of structural deformations and is the southern margin of the area of occurrence of ophiolite-type ultramafic rocks in Eastern Kamchatka.