Presentation Information
[S2-P-04]Salinity and homogenization temperature of fluid inclusions in carbonate veins of serpentinite bodies of Sanbagawa metamorphic rocks and Migabu green stones from Nagatoro and Minano town, Saitama prefecture, Japan
*Reiya Kitajima1, Toma Tanaka1, Tatuhiko Kawamoto1 (1. Shisuoka Univ. sci.)
Keywords:
ophicarbonate,Mikabu Belt,fluid inclusions
Ophicarbonates were collected from Minano Town, Saitama Prefecture, and analyses were conducted on both fluid inclusions and the classification of surrounding rocks. The study area is located within the Mikabu Belt, where the constituent rocks have undergone low-temperature, high-pressure metamorphism of oceanic plate origin. The river from which the samples were obtained exhibits widespread exposure of these metamorphic rocks due to erosion. The collected ophicarbonates can be classified into several types based on the carbonate minerals they contain and the morphology of their vein intrusions (Oyanagi et al., 2025, JpGU Abstract). Raman spectroscopy revealed that the carbonate minerals in the rocks consist of calcite and dolomite. Microthermometric analysis indicated homogenization temperatures of 170 ±25 °C (n = 9), and final ice melting temperatures suggest an average salinity of 2.6 ± 0.5wt.% NaCl (n = 9). In this presentation, we compare these results with those reported by Tanaka et al. (2024, JpGU Abstract), who analyzed ophicarbonates derived from the mantle wedge in Nagatoro. Through this comparison, we aim to discuss the formation of carbonation in the oceanic plate and the mantle wedge.