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Figure 1.
Arc decarbonation. (A) Schematic representation of plutons intruding carbonate-bearing crust at various depths in a magmatic arc (not to scale); (B) 30-cm-wide outcrop of garnet, clinopyroxene, and wollastonite (white) typical of Sierra Nevada batholith skarn; (C) 20-cm-wide slab of garnet-wollastonite-diopside calc-silicate rock with folding of original sedimentary structures; (D) calc-silicate with garnet (red) showing traces of Al-rich domains in garnet-wollastonite calc-silicate (coin is 24 mm across); (E) laminated carbonate typical of rocks metamorphosed to form C and D (hammer is 28 cm long); (F) cartoon depicting metamorphic decarbonation, common metamorphic rock types, their protoliths, CO2 yields; (G) retrograde calcite deposited in 1-cm-wide cavity within garnet skarn.
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