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1 Hawaii Institute of Geophysics and Planetology, 2525 Correa Road, University of Hawaii, Honolulu, Hawaii 96822, USA
2 Institute of Marine Sciences, University of Alaska, Fairbanks, Alaska 99775, USA
3 Department of Oceanography, 1000 Pope Road, University of Hawaii, Honolulu, Hawaii 96822, USA
Several recently discovered active mud volcanoes on the nonaccretionary Mariana convergent plate margin are erupting slab-derived fluids, serpentine mud, and metamorphosed rocks from depths of as great as 25 km. Blueschist materials from the metamorphosed subducted plate are contained in the muds. Pore fluids indicate a depth dependence for decarbonation. The mud volcanoes record in situ conditions along the decollement, including pressure and temperature conditions and physical properties within the subduction zone. Similar mud-flow material occurs worldwide as "sedimentary serpentinite" deposits in accreted fragments of former convergent margins, making this kind of mud volcanism a more important phenomenon in convergent margins than previously recognized.
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