Carbon isotopic thermometry calibrated by dolomite-calcite solvus temperatures
Carbon isotopic thermometry calibrated by dolomite-calcite solvus temperatures
复制标题
通过白云石-方解石固溶线温度校准碳同位素测温
DOI：
10.1016/0016-7037(83)90104-7
复制
发表时间：
1983
影响因子：
5
通讯作者：
Kazuhiro Suzuki
中科院分区：
文献类型：
--
作者：
H. Wada;Kazuhiro Suzuki
The temperature dependence of carbon isotopic fractionations between calcite and graphite, and between dolomite and graphite are calibrated by the calcite-dolomite solvus geothermometry using marbles collected from the contact metamorphic aureole in the Kasuga area, central Japan. The carbon isotopic fractionations (Δ13CCc-GrandΔ13CDoGr) systematically decrease with increasing metamorphic temperature. The concordant relationships between the fractionations and solvus temperatures are approximately linear withT−2over the temperature range. 400° to 680°C:Δ13CCcGr(%.) = 5.6 × 106×T−2(K) − 2.4Δ13CDoGr(%.) = 5.9 × 106×T−2(K) − 1.9 These systematic relationships between fractionation and temperature suggest that carbon isotopic equilibria between carbonates and graphite were attained in many cases. The equation for the calcite-graphite system has a slope steeper thanBottinga's(1969) results. It is, however, in good agreement with that ofValleyandO'Neil(1981) in the temperature range from 600° to 800°C.Because of the relatively high sensitivity to temperature, these isotopic geothermometers are useful for determining the temperatures in moderate- to high-grade metamorphosed carbonate rocks.
