Laboratory measurements of P-wave velocity of granulites from Luetzow-Holm Complex, East Antarctica: Preliminary report

• Main Authors: Keigo Kitamura, Masahiro Ishikawa, Makoto Arima, Kazuyuki Shiraishi
• Format: Report
• Language: English
• Published: Department of Polar Science, School of Mathematical and Physical Science, The Graduate University for Advanced Studies/Graduate School of Environment and Information Sciences, Yokohama National University/Graduate School of Environment and Information Sciences, Yokohama National University/National Institute of Polar Research 2001
• Subjects: P-wave velocity; Liitzow-Holm Complex; granulite; biotite; East Antarctica; Antarc*; Antarctica; Polar geoscience
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3093; http://id.nii.ac.jp/1291/00003093/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3093&item_no=1&attribute_id=18&file_no=1

P-wave velocities (Vp) were measured for nine samples of granulite facies metamorphic rock from the early Paleozoic Liitzow-Holm Complex, East Antarctica. The measurements were done at pressures from 0.1 Gpa to 1.0 Gpa and at temperatures from 25℃ to 400℃ with a piston-cylinder apparatus. Vp values of the ultrabasic-basic granulites range from 6.65 to 7.29 km/s at 1.0 Gpa and 25℃. The felsic gneiss shows nearly constant Vp value from 25℃ to 400℃ at 0.6 and 1.0 Gpa, whereas it exhibits rapid decrease of Vp with increasing temperature at 0.4Gpa. In all rock samples measured, the biotite-two pyroxene granulite shows the strongest negative thermal effect of Vp (0.45 km/s). This strong thermal effect is attributed to relatively higher biotite abundance.