Chondrules are major components of chondrites and are believed to drive the accretion of planetary embryos. As such, constraining the timing and origin of chondrules is central for understanding the early evolution of the solar system and the formation of planets. Enstatite chondrites (ECs) have isotope compositions for multiple elements that match that of the Earth and, thus, are considered to be good analogs of the precursor material from which the Earth formed. Here, we report the first high-precision mass-independent Cr isotope data of nine chondrules in one of the least-altered EH chondrites, Sahara 97096. Seven primitive chondrules show typical 54 Cr/ 52 Cr ratios of bulk ECs, whereas two chondrules have ratios similar to carbonaceous chondrites. The presence of two chondrules with a carbonaceous chondrite signature suggests early inward transport of material to the EC accretion region. The Mn/Cr ratios of the EC-like chondrules (except one with high Fe ...

中文翻译：

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铬同位素钙辉石球粒陨石的起源与年代溯源

球粒陨石是球粒陨石的主要成分，据信可以驱动行星胚胎的积聚。因此，限制球囊的时间和起源对于理解太阳系的早期演化和行星的形成至关重要。顽辉长晶陨石（EC）具有与地球相匹配的多种元素的同位素组成，因此被认为是地球形成前体材料的良好类似物。在这里，我们报告了变化最小的EH球粒中的9个球粒的第一个高精度的质量无关的Cr同位素数据，撒哈拉沙漠97096。七个原始球粒显示大体积EC的典型54 Cr / 52 Cr比，而两个球粒具有比率类似于碳质球粒陨石。两个带有碳质球粒陨石特征的球囊的存在表明材料向内向EC积聚区域的早期向内运输。类EC球粒的Mn / Cr比率（高Fe的除外）