35 research outputs found
(Table 4b) Chemical composition of metamorphic rocks from the lower unit of the Khavyven Highland
(Table 1c) Microprobe analyses of troctolites from the ophiolite complex in the Hunter Fracture Zone
(Table 5) K-Ar age of leucocratic epidote-mica crystalline schists from the lower unit of the Khavyven Formation
(Table 1a) Chemical composition of minerals from crystalline schists of the lower unit of the Khavyven series
(Table 2) Chemical composition of amphiboles from epidote-amphibole and epidote-mica-amphibole green schists in the upper unit of the Khavyven Highland
(Table 1b) Composition of garnets from crystalline schists of the lower unit of the Khavyven series
(Table 4a) Chemical composition of metamorphic rocks from the upper unit of the Khavyven Highland
(Table 3) Chemical composition of micas from epidote-mica-amphibole green schists in the upper unit of the Khavyven Highland
Chemical composition and age of metamorphic rocks from the Khavyven Highland, Eastern Kamchatka
Metamorphic rocks of the Khavyven Highland in eastern Kamchatka were determined to comprise two complexes of metavolcanic rocks that have different ages and are associated with subordinate amounts of metasediments. The complex composing the lower part of the visible vertical section of the highland is dominated by leucocratic amphibole-mica (+/-garnet) and epidote-mica (+/-garnet) crystalline schists, whose protoliths were andesites and dacites and their high-K varieties of island-arc calc-alkaline series. The other complex composing the upper part of the vertical section consists of spilitized basaltoids transformed into epidote-amphibole and phengite-epidote-amphibole green schists, which form (together with quartzites, serpentinized peridotites, serpentinites, and gabbroids) a sea-margin ophiolitic association. High LILE concentrations, high K/La, Ba/Th, Th/Ta, and La/Nb ratios, deep Ta-Nb minima, and low (La/Yb)_N and high 87Sr/86Sr ratios of the crystalline schists of the lower unit are demonstrated to testify to their subduction nature and suggest that their protolithic volcanics were produced in the suprasubduction environment of the Ozernoi-Valaginskii (Achaivayam-Valaginskii) island volcanic arc of Campanian-Paleogene age. The green schists of the upper unit show features of depleted MOR tholeiitic melts and subduction melts, which cause the deep Ta-Nb minima, and low K/La and 87Sr/86Sr ratios suggesting that the green schists formed in a marginal basin in front of the Ozernoi-Valaginskaya island arc. Recently obtained K-Ar ages in the Khavyven Highland vary from 32.4 to 39.3 Ma and indicate that metamorphism of the protolithic rocks occurred in Eocene under effect of collision and accretion processes of the arc complexes of the Ozernoi-Valaginskii and Kronotskii island arcs with the Asian continent and the closure of forearc oceanic basins in front of them. The modern position of the collision suture that marks the fossil subduction zone of the Ozernoi-Valaginskii arc and is spatially restricted to the buried Khavyven uplift in the Central Kamchatka Depression characterized by well-pronounced linear gravity anomalies