Abstract
Dive #857 by “SHINKAI 2000” was carried out at Iheya Ridge of Okinawa Trough in April of 1996 to collect deepsea sediments and rocks. Some rocks collected near hydrothermal vents were covered by white microbial mats. Detailed studies by optical microscope, scanning electron microscope, fluorescence microscope, energy dispersion X-ray analysis and X-ray diffraction analysis showed that the white microbial mats consisted of a lot of needle-like quartz crystals and spherical materials . The spherical materials existed around quartz crystals. It can be considered that they influence the formative period of these crystals.
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