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زمینشناسی و معدن::
سرپانتین
A special situation is present in the forearc area of the Marianas in the western Pacific where serpentinite mud- diapirs occur.
30 km wide and contain abundant fragments of serpentinite (mantle peridotite transformed into serpentinite by water absorption), gabbro, and basalt.
Serpentinite mud-volcanoes are only known from the intra-oceanic subduction zone of the Marianas; this suggests that they only form where oceanic lithosphere is present in the outer part of the upper plate.
The accompanying fractures allow sea water to pen- etrate deep into the lithospheric mantle and cause it to change partly to serpentinite.
The serpentinite
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