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- W1991435441 abstract "The Moresby Seamount located in the Woodlark Basin is a fragment of oceanic crust (dolerites and gabbros) generated 66.4 ± 1.5 My ago before being obducted during the Eocene on the Australian margin. Since 8 My, the motion of a normal fault related to the opening of the Woodlark Basin is responsible for the unroofing of the Moresby seamount. The latter was sampled during the ODP campaign Leg 180 in 1998. Geochemical compositions of dolerites can be explained by a process of fractional crystallization in which the magnesian spinel was involved. Therefore fractionation processes took place at relatively high pressure (>1 GPa), most likely during the upward migration of deep magmas throughout the mantle. The Fe-rich gabbros, more differentiated than the dolerites, could have derived from an early differentiated magma evolving in the crust at relatively low pressures. The trace element content of dolerites indicates that their source was a depleted oceanic mantle slightly influenced by arc-related magmas. This study suggests that the ophiolites fragment of the Moresby seamount was created in the vicinity of a subduction zone; this model being in agreement with the regional tectonic setting of SE Asian since the Cainozoic." @default.
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- W1991435441 date "2008-07-01" @default.
- W1991435441 modified "2023-09-25" @default.
- W1991435441 title "Dolerites of the Woodlark Basin (Papuan Peninsula, New Guinea): A geochemical record of the influence of a neighbouring subduction zone" @default.
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- W1991435441 doi "https://doi.org/10.1016/j.jseaes.2007.12.003" @default.
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