Calcite-graphite thermometer

The calcite- Graphite coexists with calcite in a wide variety of metamorphic rocks and is graphite potentially a useful thermometer at temperatures above 600 °C. There are three... [Pg.302]

Valley JW, O Neil JR (1981) C/ C exchange between calcite and graphite a possible thermometer in Greville marbles. Geochim Cosmochim Acta 45 411 19 Valley JW, Bohlen SR, Essene EJ, Lamb W (1990) Metamorphism in the Adirondacks. II. J Petrol 31 555-596... [Pg.275]

Figure 16. Measured values of A(Cc-Gr) versus metamorphic temperature independently determined by petrologic thermometers. Data are from Valley and O Neil (1981), open triangles Wada and Suzuki (1983), asterisks Kreulen and van Seek (1983), squares Morikiyo (1984), circles and Dutm and Valley (1992), solid triangles and hea y cnrved line. The umnetamorphosed calcite-organic matter fractionation is from Eichmatm and Schidlowski (1975). Samples show a successive approach to equilibrium at higher temperatures rate-limited by slow exchange in graphite (from Dntm and Valley 1992).

$Figure 16. Measured values of A(Cc-Gr) versus metamorphic temperature independently determined by petrologic thermometers. Data are from Valley and O Neil (1981), open triangles Wada and Suzuki (1983), asterisks Kreulen and van Seek (1983), squares Morikiyo (1984), circles and Dutm and Valley (1992), solid triangles and hea y cnrved line. The umnetamorphosed calcite-organic matter fractionation is from Eichmatm and Schidlowski (1975). Samples show a successive approach to equilibrium at higher temperatures rate-limited by slow exchange in graphite (from Dntm and Valley 1992).$

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