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6 Kasahara, H, Masuda, Ariyoshi. & K. Fujioka, southwestern mapping T. Gamo, Mariana Lost T. Ishii, M. volcanoes of the Island Arc: New swath- and geochemical studies of the extension of the Mariana active island arc, J. Geophys. Res., submitted. Gamo, T. and Y9204 the shipboard scientific party of the cruise, Revisits to the mid-mariana hydrothermal the southern submersible Trough Shinkai 6500, InterRidge News, 2,11' T., H. Chiba, P. Fryer, J, Ishibashi, T, Ishii,L.E. U. Tsunogai, T. Yamaguchi, Mariana (Y9204 hydrothermal area and discovery of hydrothermal vents in the southern Mariana region, JAMSTEC J. Deep Sea Res., 10, ,1994 (in Japanese with English abstract). Gamo, T., Wide submarine variation of chemical characteristicsof hydrothermal fluids due to secondary interaction: a review, 3He/heat ratiosin submarine hydrotbermal systems: evidence from two plumes over the Juan de Fuca ridge, Nature. 337, ,1989. Palmer, M.R., Boron isotope systematics of hydrothermal fluids and tourmalines: a synthesis, Chem. GeoL(Isotope GeoscL), 94, ,1991. Rona, PA and D.A. Trivett,Discrete and diffuse beat transfer at ASHES vent field,axial Volcano, Juan de Fuca Ridge, Earth Planet. Sci. Lett., 109, 57-71, Sakai, H., M. Yamano, T. Tanaka, T. Gamo, E-S. Kim, J. Ishibashi, K. Sbitashima, T. Matsumoto, T. Oomori, F. Yanagisawa and M. Tsutsumi. Geocbemical studies of the hydrothermal system at in Biogeochemical Processes and Ocean Flux in the Western Pacific (H. Sakai & Y. Nozaki, eds.), TERRAPUB, ,1995. Haymon, R.M. Lilley, M.R. DJ. Fomari, Perfit,J.M. Edmond, R.A. Lutz, J.M. Grebmeier, E. McLaughlin, Tokyo, pp. K.L. Von Damm, W.C. Shanks,III, 424, JAMSTEC Tech. RepL Deepsea Res., 6, 69-85, 1990 (in Japanese, with English abstract). S. Caibotte, D. Wright, Volcanic eruption of the mid-ocean ridge along the East Pacific Rise crest at ,N: Direct submersible the Izena Cauldron using "Sbinkai 2000" Reports on dive numbers 413 and 415, and on the liquid C02 bubbles and hydrate collected during dive number Mi). M. Smith, N. Beedle, and E. Olson, observations Tsunogai, U., J. Ishibashi, H. Wakita, H. Masuda, T. Gamo, & K. Fujioka, Geocbemical features of the southern Mariana Trough region as revealed by of seafloor phenomena dissolved chemical composition of hydrothermal fluids, Japan Earth and Planetary Sciences Joint Meeting, H31-01,1994 (abstract). associated with an eruption event in April, 1991, Earth Planet. ScL Lett.,119,85-101,1993. Hessler, R., P. Lonsdale ocean Horibe, floor,new and J. Hawkins, Patterns on the Scientist,24(March), 47-51,1988. Y., K.-R. Kim and H. Craig, Hydrothermal methane plumes in the Mariana back-arc spreading centre, Nature, 324, ,1986. Hussong, D.M. & S. Uyeda, Tectonic processes and the history of the Mariana arc: A synthesis of the results of Deep Sea Drilling Project Leg 60, in Init Repts. DSDP, 60 (DM. Hussong, S. Uyeda et al eds.). Deep Sea Drilling Project, Washington ,1981. Ishibashi, J. and T. Urabe, Hydrothermal to arc-backarc magmatism Backarc Ishibashi, activityrelated in the western Pacific, in Basins: Tectonics and Magmatism, Taylor, Plenum ,1995. Press, New J., Y. Sano, Tsutsumi, geochemistry and D.C., pp. York H. Wakita, H. Sakai, of hydrothennal Helium ed by B. & London, pp. T. Gamo, M. and carbon fluids from the Mid- of Res., 10, , 1994 (in Japanese with English abstract). Lupton, J.E., E.T. Baker and GJ. Massoth, Variable modification processes after high temperature waterrock Arc Basin, southwest texture of the hydrotbermal sulfide-sulfatechimney near 180N, Mariana Trough, JAMSTEC J. Deep Sea and K. Fujioka, 1992 diving survey by "Shinkai 6500" cruise): revisits to the mid-mariana Back Hydrothennal vent depossits and two magma sources for volcanoes near 13*20"N in the Mariana backarc: a view from Sbinkai 6500, EOS Trans. AGU, 74(43), Fall Meet. Suppl., 681,1993 (abstract). Kase, K., T. Shibata, & T. Gamo, Mineralogy and ore Johnson, K. Kelly, H. Masuda, S. Ohta, A-L, Reysenbach, P.A. Rona, T. Shibata, J. Tamaoka, H. Tanaka, Trough Japan. Chem. GeoL, , Johnson, L, P. Fryer, H. Masuda, T. Ishii& T. Gamo, site and discovery of new venting in Mariana region by the Japanese 14,1993. Gamo, Okinawa Tsunogai, Geocbemical studies of migration process and source of fluidsin the crust,ph D. Thesis, University of Tokyo, 116pp., T. Gamo, Ocean Research Institute,University of Tokyo, Minamidai, Nakano-ku, Tokyo 164, Japan ( gamo@ori.u-tokyo.ac.jp) U. Tsunogai, Institutefor Hydrospheric-Atmospheric Sciences, Nagoya University, Furocho, Chikusa-ku, Nagoya , Japan (urumu@ihas.nagoya-u.ac.jp) J. Ishibashi, Laboratory for Earthquake Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan (ishi<3>eqchem.s.u-tokyo.ac.jp) H. Masuda, Department of Geo sciences,osaka City University, , Sugimoto, Sumiyoshi-ku, Osaka 558, Japan (barue@sci.osaka-cu.ac.jp) H. Chiba, Department of Earth and Planetary Sciences, Kyushu University, , Hakozaki, Higashi-ku, Fukuoka 812, Japan (hchiba@geo.kyushuu.ac.jp) 74 -

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