Figure F8. Most of the deformed gabbros recovered from ODP Hole 735B exhibit a well developed foliation dipping at 25°-35° and showing varying degrees of velocity anisotropy in laboratory experiments. A.Core photograph of Sample 118-735B-2D-1, 110-121 cm, shows a good example of a typical porphyroclastic foliated metagabbro with the yellow circle marking the location of the minicore used for laboratory velocity measurements as a function of confining pressure. B. Photomicrograph of the end piece of the same minicore shows the main mineral constituents (plagioclase-clinopyroxene-hornblende) as well as the well developed foliation. C. At a confining pressure of 200 MPa, this particular sample exhibits various degrees of shear wave splitting with the fast and slow directions being parallel and perpendicular to the foliation, respectively. The changes in delay time were obtained by rotating the transducers by 0°, 45°, 60°, and 90° (from Iturrino et al., 1991).

Figure F8. Most of the deformed gabbros recovered from ODP Hole 735B exhibit a well developed foliation dipping at 25°-35° and showing varying degrees of velocity anisotropy in laboratory experiments. A.Core photograph of Sample 118-735B-2D-1, 110-121 cm, shows a good example of a typical porphyroclastic foliated metagabbro with the yellow circle marking the location of the minicore used for laboratory velocity measurements as a function of confining pressure. B. Photomicrograph of the end piece of the same minicore shows the main mineral constituents (plagioclase-clinopyroxene-hornblende) as well as the well developed foliation. C. At a confining pressure of 200 MPa, this particular sample exhibits various degrees of shear wave splitting with the fast and slow directions being parallel and perpendicular to the foliation, respectively. The changes in delay time were obtained by rotating the transducers by 0°, 45°, 60°, and 90° (from Iturrino et al., 1991).