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Martindale, Marina; Skora, Susanne; Pickles, Jonathan; Elliott, Tim; Blundy, Jonathan; Avanzinelli, Riccardo (2016): Geochemistry of subducted volcaniclastic sediments from Mariana arc magmas. PANGAEA,

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The phase relations of natural volcaniclastic sediments from the west Pacific Ocean were investigated experimentally at conditions of 3-6 GPa and 800-900 °C with 10 wt.% added H2O (in addition to ~ 10 wt.% structurally-bound H2O) to induce hydrous melting. Volcaniclastic sediments are shown to produce a sub-solidus assemblage of garnet, clinopyroxene, biotite, quartz/coesite and the accessory phases rutile ± Fe-Ti oxide ± apatite ± monazite ± zircon. Hydrous melt appears at temperatures exceeding 800-850 °C, irrespective of pressure. The melt-producing reaction consumes clinopyroxene, biotite and quartz/coesite and produces orthopyroxene. These phase relations differ from those of pelagic clays and K-bearing mid ocean ridge basalts (e.g. altered oceanic crust) that contain phengite, rather than biotite, as a sub-solidus phase. Despite their relatively high melt productivity, the wet solidus for volcaniclastic sediments is found to be higher (825-850 °C) than other marine sediments (700-750 °C) at 3 GPa. This trend is reversed at high-pressure conditions (6 GPa) where the biotite melting reaction occurs at lower temperatures (800-850 °C) than the phengite melting reaction (900-1000 °C).
Trace element data was obtained from the 3 GPa run products, showing that partial melts are depleted in heavy rare earth elements (REE) and high field strength elements (HFSE), due to the presence of residual garnet and rutile, and are enriched in large ion lithophile elements (LILE), except for Sr and Ba. This is in contrast to previous experimental studies on pelagic sediments at sub-arc depths, where Sr and Ba are among the most enriched trace elements in glasses. This behavior can be partly attributed to the presence of residual apatite, which also host some light REE in our supra-solidus residues. Our new experimental results account for a wide range of trace element and U-series geochemical features of the sedimentary component of the Mariana arc magmas, including imparting a substantial Nb anomaly to melts from an anomaly-free protolith.
Related to:
Martindale, Marina; Skora, Susanne; Pickles, Jonathan; Elliott, Tim; Blundy, Jonathan; Avanzinelli, Riccardo (2013): High pressure phase relations of subducted volcaniclastic sediments from the west pacific and their implications for the geochemistry of Mariana arc magmas. Chemical Geology, 342, 94-109,
Source data set:
Hermann, Jörg; Spandler, Carl (2007): Sediment Melts at Sub-arc Depths: an Experimental Study. Journal of Petrology, 49(4), 717-740,
Hofmann, Albrecht W (1988): Chemical differentiation of the Earth: the relationship between mantle, continental crust, and oceanic crust. Earth and Planetary Science Letters, 90(3), 297-314,
Johnson, Marie C; Plank, Terry (2000): Dehydration and melting experiments constrain the fate of subducted sediments. Geochemistry, Geophysics, Geosystems, 1(12), n/a-n/a,
Karpoff, Anne Marie (1992): Cenozoic and Mesozoic sediments from the Pigafetta Basin, Leg 129, Sites 800 and 801: Mineralogical and geochemical trends of the deposits overlying the oldest oceanic crust. In: Larson, RL; Lancelot, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 129, 3-30,
Kelley, Katherine A; Plank, Terry; Ludden, John N; Staudigel, Hubert (2003): Composition of altered oceanic crust at ODP Sites 801 and 1149. Geochemistry, Geophysics, Geosystems, 4(6),
Koppers, Anthony AP; Yamazaki, Toshitsugu; Geldmacher, Jörg; Expedition 330 Scientists (2011): Proceedings of the Integrated Ocean Drilling Program. Washington, DC (Integrated Ocean Drilling Program Management International, Inc.), 330,
Schmidt, Max W; Vielzeuf, Daniel; Auzanneau, Estelle (2004): Melting and dissolution of subducting crust at high pressures: the key role of white mica. Earth and Planetary Science Letters, 228(1-2), 65-84,
Skora, Susanne; Blundy, Jonathan (2010): High-pressure Hydrous Phase Relations of Radiolarian Clay and Implications for the Involvement of Subducted Sediment in Arc Magmatism. Journal of Petrology, 51(11), 2211-2243,
Vervoort, Jeff D; Plank, Terry; Prytulak, Julie (2011): The Hf-Nd isotopic composition of marine sediments. Geochimica et Cosmochimica Acta, 75(20), 5903-5926,
Median Latitude: 18.642200 * Median Longitude: 156.359650 * South-bound Latitude: 18.642000 * West-bound Longitude: 156.359500 * North-bound Latitude: 18.642800 * East-bound Longitude: 156.359700
Date/Time Start: 1989-12-06T17:15:00 * Date/Time End: 1989-12-17T01:15:00
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