Subduction zone metamorphism
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A subduction zone is a region of the Earth's crust where one tectonic plate moves under another tectonic plate; oceanic crust gets recycled back into the mantle and continental crust gets produced by
Melt production and accretion of melt onto continental crust in a subduction zone
Pressure-temperature pathway for subducted crust
Blueschist containing the sodic blue amphibole, glaucophane
Transition from blueschist to eclogite facies rock, containing glaucophane, omphacitic pyroxene, and garnet
Antigorite
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Antigorite is a lamellated, monoclinic mineral in the phyllosilicate serpentine subgroup with the ideal chemical formula of 3Si2O54. It is the high-pressure polymorph of serpentine and is commonly fou
Subduction zone metamorphism
…Lawsonite = Grossular + Topaz + Stishovite + H2O Antigorite Serpentine is another important water bearing phase that breaks down at eclogite facies conditions. Antigorite breaks down at 600–700 °C and between…
Antigorite crystals in serpentinite from Poland
Polished antigorite
Simplified crystal structure of antigorite looking down the b axis. Blue triangles indicate SiO4 tetrahedra, green layers indicate Mg octahedra. Red line indicates polarity reversal. In this case, m = 17.