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زمینشناسی و معدن::
کانی های آبدار
permanently transported into the mantle in sub- duction zones as water-containing sediments or within basalts whose original dry minerals are converted into water-containing minerals.
Basaltic rocks contain abundant water because interaction with seawater near the mid-ocean ridge forms water-containing minerals (zeolite, chlorite, epidote, amphibole; Ch. 5).
Under conditions of subduction metamorphism, the water-containing minerals become unstable and are replaced.
Sediments contribute significantly to the de- watering in a subduction zone although following high-pressure metamorphism they continue to in- clude water-containing minerals such as phengite (a type of mica), karpholite, chloritoid and lawsonite.
Water may also be released by the collapse of water-containing minerals.
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