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In partial agreement with the results of DSDP Leg 31 and other published works, the Leg 59 staff concedes that arc volcanism and sundering along with back-arc spreading have occurred in distinct pulses in the Philippine Sea region, migrating eastward relative to the Eurasian plate. Igneous basement becomes younger eastward ranging from pre-middle Oligocene at Site 447 in the West Philippine Basin, lower to middle Oligocene at Site 448 on the Palau-Kyushu Ridge, upper Oligocene at Site 449 in the western Parece Vela Basin, early to middle Miocene at Site 450 in the eastern Parece Vela Basin, to middle Miocene at Site 451 on the West Mariana Ridge. Details of the sequence of volcanic and tectonic events are preserved in the Leg 59 sedimentary columns. Fossil and paleomagnetic data cited in this volume (see Martini et al., Keating) indicate that since the Oligocene the entire region has remained at low latitudes, presumably within the equatorial belts of easterly trades and ocean currents. Thus older (western) sites have received the debris of more recent frontal-arc volcanism farther to the east.

Sedimentologic Summary: Clues to Arc Volcanism, Arc Sundering, and Back-Arc Spreading in the Sedimentary Sequences of Deep Sea Drilling Project Leg 59