Low-grade metamorphic temperature conditions associated with the Sanbagawa event were estimated by Raman spectroscopy of carbonaceous material (RSCM) in pelitic rocks and an electron backscatter diffraction (EBSD) analysis quartz siliceous rocks. Analytical samples collected from complex, Mikabu greenstones, Chichibu accretionary complex eastern Kanto Mountains, central Japan. Previously, low-g...

Whiskers and needles of F-rich vesuvianite were found together with diopside in cavities of an altered magnesian skarn in the Tas–Khayakhtakh Mountains of Polar Yakutia, in Russia. The acicular crystals are strongly zoned and formed between two generations of diopside. The chemical composition of the vesuvianite whiskers is more homogeneous and resembles that of the outermost rim of the vesuvia...

By Korzhinsky and Schrienemakers, methods, phase relations of Mn-Al-Ca-silicates and other minerals in highly oxidized quartzites and schists of blueschist type metamorphism have been discussed. Because, such rocks were extensively studied in central Shikoku of Japan and in Andros and Evvia islands of Greece, they have been considered as thermodynamic system for discussion. The system contains ...

Abstract This study reports three K/Ar ages on celadonite, a dioctahedral K-Fe mica, in the Proterozoic North Shore Volcanic Group (NSVG) of Midcontinent Rift northeastern Minnesota. Celadonite formed during beginning posteruptive, low-temperature conditions at temperatures<100°C and with input meteoric water. between 1062±16 Ma 955.0±12 document remarkably long posteruptive thermal hist...