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Fig.+ Geologic map of central Java as simplified from van Bemmelen (+31*). Star is location for Karakal hot-spring. Solid circles denote MT sounding sites (Mogi, et al., +331). Solid triangles denote Quaternary volcanoes while a leucite-bearing rock of Muria volcano is shown by open triangle. Lines is approximated location for volcanic front.
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Fig., The hydrated Peridotite is formed by addition of slab derived H,O (solid arrow) beneath the forearc region and should be dragged downward on the slab by the subuduction of oceanic lithosphere. Amphibole (AM) and chlorite (CHL) in the dragged hydrated peridotite layer decompose to release H,O at around ++*km just beneath a volcanic front, phlogopite (PH) decomposed at around +/*km, and lawsonite peridotite dehydrated at ,/*z-**km beneath the back-arc side of a volcanic arc. Less than0*km beneath the front-arc, subducted slab is dehydrated and migrated upward.
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