The field of clumped isotope paleothermometry is over a decade old, but the influence of precipitation rate on the fractionation of clumped isotopes between natural carbonates and their environmental solutions remains unclear. Here we apply two different proxies, carbonate clumped isotope paleothermometry and trace element analysis, to investigate whether or not precipitation rates play a major control on the fractionation of clumped isotopes. Twenty-one transect points from three calcite samples coming from veins along fractures (Jebel Madar, Oman) were investigated. The samples selected based on two different types of calcite cements were recognized: (i) Lower temperature macro-columnar calcite, and (ii) Higher temperature calcites within thin vein (“thin-vein calcites”). The Δ₄₇ values vary between 0.513 ± 0.00‰ and 0.667 ± 0.01‰ corresponding to calculated clumped isotope temperatures of 29–59 °C for macro-columnar calcite samples, and 59 ± 9 to 109 ± 1 °C for the thin-vein calcite sample. The calculated δ¹⁸O_{Fluid [VSMOW]} composition ranges between −11.2 ± 0.8 to +13.4 ± 0.0‰. Trace element results reveal a strong correlation between Fe and Mn and the clumped isotope temperatures. We argue based on published work on the incorporation of Mn and Fe into calcite minerals that this is indicative of a change in crystal growth rates. Thus for the first time we can independently show potential kinetic fractionation in ancient natural samples that resulted in apparent clumped isotope temperatures higher than environmental temperatures. The new combined clumped isotopes/trace elements approach is a critical step to future applications of the clumped isotope proxy to natural systems as it can reveal potential isotopic disequilibrium independent of the calculated temperature.

丛集同位素古热法的研究领域已有十年之久，但沉淀速率对天然碳酸盐及其环境溶液之间丛集同位素分馏的影响尚不清楚。在这里，我们应用两种不同的代理方法，即碳酸盐丛集同位素古温度计和痕量元素分析，来研究沉淀速率是否对丛集同位素的分级起主要控制作用。研究了来自沿裂缝的静脉（Jebel Madar，阿曼）的三个方解石样品的二十一个横断面。基于两种不同类型的方解石胶结剂选择的样品得到认可：（i）低温大柱状方解石，和（ii）细脉内的高温方解石（“薄方解石”）。该Δ ₄₇数值在0.513±0.00‰和0.667±0.01‰之间变化，对应于大柱状方解石样品的计算成簇同位素温度为29–59°C，而薄脉管方解石样品的计算成簇同位素温度为59±9至109±1°C。所计算出的δ ¹⁸ ö_{流体[VSMOW]}组成范围为-11.2±0.8至+13.4±0.0‰。痕量元素结果表明，Fe和Mn与团聚的同位素温度之间具有很强的相关性。我们基于已发表的有关将锰和铁掺入方解石矿物中的研究表明，这表明晶体生长速率发生了变化。因此，我们首次能够在古代自然样品中独立显示潜在的动力学分级分离，从而导致表观成簇的同位素温度高于环境温度。新的丛集同位素/痕量元素组合方法是丛集同位素替代物在自然系统中未来应用的关键步骤，因为它可以显示与计算温度无关的潜在同位素不平衡。