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COVER: Rock dredge of the German R/V Sonne entering the waters of the Aleutian Island Arc. Dredging in the western Aleutians in 2016 and prior years led to the discovery of a submerged front of active seafloor volcanism dominated by dacite and rhyodacite produced primarily by partial melting of subducting oceanic crust. The hydrous fluids that triggered such melting were likely produced by dewatering of serpentinite in the underlying mantle section of the subducting Pacific plate. See “Boron isotopes identify deep–slab serpentinite in the source of Aleutian arc magma” by Owen Jensen et al., p. 114–118.
Photo by Gene Yogodzinski, University of South Carolina.
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