Sulfur is an important element present in natural kimberlites and along with CO2, S can play a role in the kimberlite degassing. We have investigated experimentally the change in S content and CO2 solubility in synthetic kimberlitic melts in response to a range of pressure (0.5 to 2.0 GPa) and temperature (1500 to 1525 °C). Several initial S concentrations were investigated ranging from 0 to 24000 ppm. The dissolved CO2 and S were determined by Raman spectroscopy and Electron Probe Micro-Analyses. Under the investigated oxidizing conditions (ΔFMQ + 1), S is dissolved in the glass only as S6+ forming sulfate molecular groups (SO42−). The measured S concentration in the glasses increases from 2900 to 22000 ppm. These results suggest that the experimental conditions were below saturation with respect to S and that the S solubility is higher than 22000 ppm for kimberlitic melts; regardless of the experimental conditions considered here. CO2 is dissolved as CO32− molecular groups. The CO2 solubility ranges from 3.0 to 11.3 wt% between 0.5 and 2.0 GPa. CO2 solubility is not affected by the presence of S; which suggests that SO42− and CO32− clusters have two distinct molecular environments not interacting together. This result implies that both CO2 and S are efficiently transported by kimberlitic melt from the upper mantle towards the atmosphere.

中文翻译：

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单点金伯利岩中的高 S 和高 CO2 含量：一项实验和拉曼光谱研究

硫是天然金伯利岩中存在的重要元素，与 CO2 一起，S 可以在金伯利岩脱气中发挥作用。我们通过实验研究了合成金伯利岩熔体中 S 含量和 CO2 溶解度的变化，以响应一定范围的压力（0.5 至 2.0 GPa）和温度（1500 至 1525 °C）。研究了几种初始 S 浓度，范围从 0 到 24000 ppm。溶解的 CO2 和 S 由拉曼光谱和电子探针微分析测定。在研究的氧化条件 (ΔFMQ + 1) 下，S 仅以 S6 + 的形式溶解在玻璃中，形成硫酸盐分子基团 (SO42-)。玻璃中测得的 S 浓度从 2900 ppm 增加到 22000 ppm。这些结果表明，关于 S 的实验条件低于饱和，并且金伯利岩熔体的 S 溶解度高于 22000 ppm；不管这里考虑的实验条件如何。CO2 溶解为 CO32 - 分子团。CO2 溶解度范围为 3.0 至 11.3 wt%，介于 0.5 和 2.0 GPa 之间。CO2 溶解度不受 S 存在的影响；这表明 SO42- 和 CO32- 簇有两个不同的分子环境，它们不相互作用。这一结果意味着 CO2 和 S 都被金伯利岩熔体从上地幔有效地输送到大气中。CO2 溶解度不受 S 存在的影响；这表明 SO42- 和 CO32- 簇有两个不同的分子环境，它们不相互作用。这一结果意味着 CO2 和 S 都被金伯利岩熔体从上地幔有效地输送到大气中。CO2 溶解度不受 S 存在的影响；这表明 SO42- 和 CO32- 簇有两个不同的分子环境，它们不相互作用。这一结果意味着 CO2 和 S 都被金伯利岩熔体从上地幔有效地输送到大气中。