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Fig. 9 | Earth, Planets and Space

Fig. 9

From: Water distribution in quartz schists of the Sanbagawa Metamorphic Belt, Japan: infrared spectroscopic mapping and comparison of the calibrations proposed for determining water contents

Fig. 9

Water distributions in quartz in Sanbagawa metamorphic rocks of various metamorphic grades along the Asemi River. The ranges of water content obtained by us using IR mapping are shown. Data from Nakashima et al. (1995) obtained by point analyses are also shown after modifying their calibration to fit the calibration of Paterson (1982). Data for the grain sizes of quartz and grain morphologies are from Yagi and Takeshita (2002). (They reported type-I and type-III grains, but no type-II grains.) Note that the locations and textures of their specimens are not exactly the same as ours. The distances in kilometers are measured to the north of the intersection between the Yoshino and Asemi Rivers (Fig. 1), and each location was traced along a straight line. For our samples, blue indicates pelitic rock, yellow indicates psammitic rock, and red indicates siliceous rock

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