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Fig. 3 | Earth, Planets and Space

Fig. 3

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. 3

a IR spectra showing different absorbances of water bands at 2800–3750 cm−1. Spectra numbers: 1–4 = quartz from the Asemi River, with 1 = sample No. 7-35, 2 = No. 7-49, 3 = No. 7-89, and 4 = No. 7-35 (healed cracks; see the IR mapping result in Fig. 8 and the text); 5 = albite porphyroblast with minor quartz (No. 7-35); 6 = chalcedony from Oshamanbe. The structural vibrations < 2300 cm−1 roughly distinguish mineral species. The spectra show typical stretching bands of molecular H2O. Atmospheric CO2 bands are seen around 2360 cm−1. The IR spectrum of chalcedony has a weak Si–OH band at 3585 cm−1. b Relationship between band heights and integral absorbance of molecular H2O. The left figure includes data for chalcedony that show much higher values than the others. The right figure shows only data for the Asemi River samples

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