Abstract We present the results of melting experiments on a suite of carbonaceous and ordinary chondritic compositions (CV, CM, CI, H and LL) performed at low pressure (0.1–13.1 MPa) and over a range of oxygen fugacity (log fO2 − (log fO2)IW = −2.5 to −1 and +0.8, IW being the iron-wustite buffer). These experiments constrain the composition of partial melts (F = 5–25 wt.%) of chondritic planetesimals. Most experiments (IW −2.5 to −1) were conducted in Molybdenum-Hafnium Carbide pressure vessels, which prevented the loss of alkali elements from the melt. The results show that all planetesimals not significantly depleted in moderately volatile elements relative to the sun’s photosphere (e.g. CI, H and LL compositions) produced low-degree melts (

中文翻译：

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在微行星熔化开始时广泛生产富含硅和碱的熔体

摘要 我们展示了在低压 (0.1–13.1 MPa) 和氧逸度范围 (log fO2 - (log fO2 - (log fO2)) 下对一系列碳质和普通球粒陨石成分 (CV、CM、CI、H 和 LL) 进行的熔融实验结果。 log fO2)IW = -2.5 到 -1 和 +0.8，IW 是铁-方氏体缓冲液）。这些实验限制了球粒陨石星子的部分熔体（F = 5-25 wt.%）的组成。大多数实验（IW -2.5 到 -1）是在钼-铪碳化物压力容器中进行的，这防止了熔体中碱元素的损失。结果表明，所有相对于太阳光球层（例如 CI、H 和 LL 成分）的中等挥发性元素未显着耗尽的所有星子都产生了低度熔体（