Microdiamonds in garnetites of graphite-free ultrahigh pressure metamorphic rocks (T = 600 °C; P = 3.2 GPa) from Lago di Cignana (western Alps, Italy) represent the first occurrence of diamond in a lowtemperature subduction complex of oceanic origin. The presence of diamonds in fluid inclusions provides evidence for carbon dissolution, transport, and precipitation in oxidized C-O-H crustal fluid buffered by mineral equilibria at sub-arc mantle depths.
Frezzotti, M. (2015). Diamonds from the Alps reveal carbon mobility in subduction zones. RENDICONTI ONLINE DELLA SOCIETÀ GEOLOGICA ITALIANA, 37, 28-30 [10.3301/ROL.2015.168].
Diamonds from the Alps reveal carbon mobility in subduction zones
Frezzotti, ML
2015
Abstract
Microdiamonds in garnetites of graphite-free ultrahigh pressure metamorphic rocks (T = 600 °C; P = 3.2 GPa) from Lago di Cignana (western Alps, Italy) represent the first occurrence of diamond in a lowtemperature subduction complex of oceanic origin. The presence of diamonds in fluid inclusions provides evidence for carbon dissolution, transport, and precipitation in oxidized C-O-H crustal fluid buffered by mineral equilibria at sub-arc mantle depths.
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