In our solar system, terrestrial planets and meteoritical matter exhibit various bulk compositions. To understand this variety of compositions, formation mechanisms of meteorites are usually investigated via a thermodynamic approach that neglect the processes of transport throughout the protosolar nebula. Here, we investigate the role played by rocklines (condensation/sublimation lines of refractory materials) in the innermost regions of the protosolar nebula to compute the composition of particles migrating inward the disk as a function of time. To do so, we utilize a one-dimensional accretion disk model with a prescription for dust and vapor transport, sublimation and recondensation of refractory materials (ferrosilite, enstatite, fayalite, forsterite, iron sulfide, metal iron and nickel). We find that the diversity of the bulk composition of cosmic spherules, chondrules and chondrites can be explained by their formation close to rocklines, suggesting that solid matter is concentrated in the vicinity of these sublimation/condensation fronts. Although our model relies a lot on the number of considered species and the availability of thermodynamic data governing state changes, it suggests that rocklines played a major role in the formation of small and large bodies in the innermost regions of the protosolar nebula. Our model gives insights on the mechanisms that might have contributed to the formation of Mercury's large core.

中文翻译：

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岩线是原太阳星云中难熔固体的摇篮

在我们的太阳系中，类地行星和陨石物质表现出各种不同的成分。为了理解这种不同的成分，通常通过热力学方法研究陨石的形成机制，这种方法忽略了整个原太阳星云的运输过程。在这里，我们研究了原太阳星云最内部区域中岩石线（耐火材料的冷凝/升华线）所起的作用，以计算作为时间函数向内迁移的粒子组成。为此，我们使用一维吸积盘模型，其中包含耐火材料（铁硅沸石、顽辉石、铁橄榄石、镁橄榄石、硫化铁、金属铁和镍）的灰尘和蒸汽传输、升华和再冷凝的处方。我们发现宇宙小球、球粒和球粒陨石的整体组成的多样性可以通过它们靠近岩线的形成来解释，这表明固体物质集中在这些升华/冷凝前沿附近。尽管我们的模型在很大程度上依赖于所考虑的物种数量和控制状态变化的热力学数据的可用性，但它表明岩线在原太阳星云最内部区域的大小天体的形成中发挥了重要作用。我们的模型提供了对可能促成水星大核心形成的机制的见解。尽管我们的模型在很大程度上依赖于所考虑的物种数量和控制状态变化的热力学数据的可用性，但它表明岩线在原太阳星云最内部区域的大小天体的形成中发挥了重要作用。我们的模型提供了对可能促成水星大核心形成的机制的见解。尽管我们的模型在很大程度上依赖于所考虑的物种数量和控制状态变化的热力学数据的可用性，但它表明岩线在原太阳星云最内部区域的大小天体的形成中发挥了重要作用。我们的模型提供了对可能促成水星大核心形成的机制的见解。