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• W2080502022 abstract "A systematic fluid inclusion study on pelitic and granitic gneisses of the Cretaceous Abukuma metamorphic rocks, exposed in the Hanazono district, northeast Japan, identified three categories of fluid inclusions: primary aqueous inclusions in porphyroblastic garnet, primary to pseudosecondary carbonic inclusions in quartz, and secondary aqueous inclusions in quartz. The primary aqueous inclusions in garnet exhibit melting and homogenization temperatures of −2.5 to −0.3 °C and +168.2 to +360.0 °C, respectively. The dominant primary to pseudosecondary fluid inclusions in undeformed quartz display melting temperatures of −64.2 to −56.6 °C, indicating a CO2-rich composition with additional CH4 and/or N2. The carbonic inclusions can be divided into high-density (1.121-1.153 g/cm3) and medium-density (0.683-1.111 g/cm3) types. The fluid densities of the latter inclusions, when translated into isochores, indicate entrapment of CO2 at the peak P-T conditions experienced by rocks in the study area (2.8-5.2 kbar at 770-850 °C). In contrast, the isochores of high-density category in quartz and aqueous inclusions in garnet do not intersect the expected P-T trajectory, yet are consistent with the prograde high-pressure condition of the Abukuma metamorphic rocks in the Takanuki district (8-10 kbar at 700-750 °C). Isochores calculated for carbonic inclusions in granitic gneiss intersect the P-T path at 2-3 kbar at 650 °C, suggesting that the fluids were captured during the retrograde stage. It is inferred that H2O was the dominant fluid species during the prograde stage, while CO2 was more abundant during the peak to retrograde stages of the Abukuma metamorphic belt. The prograde H2O-bearing fluid was probably derived from the break down of hydrous minerals. Although the origin of carbonic fluid is not known, the presence of CO2-rich fluid during peak metamorphism probably lowers the H2O activity in the rocks. The isochores computed for secondary aqueous inclusions in quartz give very low P-T conditions (300 °C and 1.7-3.5 kbar), suggesting that the fluids are of retrograde origin." @default.
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• W2080502022 date "2007-01-01" @default.
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• W2080502022 title "Fluid inclusions study of Abukuma metamorphic rocks from the Hanazono district, northeast Japan" @default.
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• W2080502022 doi "https://doi.org/10.2465/jmps.061113" @default.
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