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Preliminary report of Kairei KR03-01 cruise: amagmatic tectonics and lithospheric composition of the Parece Vela Basin

Introduction Recent mapping studies by our group (Kasuga and Ohara, 1997; Okino et al., 1998; 1999; Ohara et al., 2001) revealed that the Parece Vela Basin (PVB) in the Philippine Sea (Fig. 1) has the geodynamic characteristics expected for amagmatic extension, thus providing a rare opportunity to study the architecture and composition of backarc basins. The study of backarc spreading systems has a strong bearing on two important aspects of the Earth’s evolution, as it relates to both subduction zone and mid-ocean ridge dynamics. Study of backarc basins thus has strong impact on both the InterRidge and MARGINS communities. The KR03-01 cruise aboard the Japan Marine Science and Technology Center’s R/V Kairei was thus scheduled to better understand the lithospheric architecture and composition of this unique backarc basin (Ohara et al., 2002). In this article, we report the preliminary results of the cruise.