The effect of polymorphism and magnesium substitution on oxygen isotope fractionation between calcium carbonate and water.
The effect of polymorphism and magnesium substitution on oxygen isotope fractionation between calcium carbonate and water.
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DOI：
10.1016/0016-7037(69)90108-2
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发表时间：
1969-08
影响因子：
5
通讯作者：
T. Tarutani;R. Clayton;T. Mayeda
中科院分区：
文献类型：
--
作者：
T. Tarutani;R. Clayton;T. Mayeda
方解石，文石和镁方解石从碳酸氢盐水溶液中缓慢沉淀，和沉淀物和水之间的氧同位素分馏因子进行了测量。对于25°C和0°C的方解石-水，1000 ln α分别为28.1和33.7，这两个值与Urey-Epstein古温标非常一致。文石水在25°C下得到28.7，这意味着文石和方解石之间存在小但显著的分馏。O 18还富集在镁方解石中，相对于在相同条件下沉淀的纯方解石，富集0.06%。每摩尔%的碳酸镁。
Calcite, aragonite and magnesian calcite were slowly precipitated from aqueous bicarbonate solutions, and oxygen isotope fractionation factors between the precipitate and water were measured. For calcite-water at 25°C and 0°C, 1000lnα= 28.1 and 33.7, respectively, both values in excellent agreement with the Urey-Epstein paleotemperature scale. Aragonitewater at 25°C gave 28.7, implying a small but significant fractionation between aragonite and calcite. O18also concentrates in magnesian calcite, relative to pure calcite precipitated under the same conditions, by 0.06%. for each mole-percent MgCO3in calcite.