Calcium-aluminum rich inclusions (CAIs) are the oldest condensates in the Solar System. Previous studies have revealed that moderately heavy and trace element isotope anomalies (e.g., Ti, Sr, Mo, and Nd) in CAIs record large nucleosynthetic isotope variations compared to bulk meteorites. Calcium is a major element in CAIs that has six stable isotopes with multiple nucleosynthetic origins. As such, Ca isotopes in CAIs have been an important target of isotopic analysis since the 1970s. However, the Ca isotope compositions of CAIs measured by previous-generation mass spectrometers are less precise than recent isotopic data of heavy elements, which complicates their direct comparisons. Obtaining high-precision Ca isotopic data provides a stronger link between CAI-formation processes from nebular gas and the origin of their source materials.

中文翻译：

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钙同位素证据证明太阳系中早期凝析油由具有不同核合成来源的未混合储层形成


富含钙铝的内含物 （CAI） 是太阳系中最古老的凝聚物。以前的研究表明，与块状陨石相比，CAI 中的中等重和微量元素同位素异常（例如，Ti、Sr、Mo 和 Nd）记录了较大的核合成同位素变化。钙是 CAI 中的一种主要元素，具有六种具有多种核合成来源的稳定同位素。因此，自 1970 年代以来，CAI 中的 Ca 同位素一直是同位素分析的重要目标。然而，上一代质谱仪测量的 CAI 的 Ca 同位素组成不如最近的重元素同位素数据精确，这使得它们的直接比较变得复杂。获得高精度的 Ca 同位素数据为星云气体的 CAI 形成过程与其源材料的来源之间提供了更强的联系。