艾伦山77307（CO3 .03）中Hibonite-Pyroxene球粒的$^{26}$ Al- $^{26}$ Mg同位素、矿物学和岩相学：这些天体起源和演化的意义
$^{26}$Al-$^{26}$Mg isotopic, mineralogy, petrography of a Hibonite-Pyroxene Spherule in Allan Hills 77307 (CO3.03): Implications for the origin and evolution of these objects
摘要：
迄今为止发现的Hibonite-Pyroxene/玻璃球粒是一种罕见的耐火包裹体套件，其显示出最大范围的外来同位素性质（富中子同位素的异常（例如，$^{48}$ Ca，$^{50}$ Ti），丰富的$^{26}$ Al），尽管它们定义了简单的球形形态和矿物学，主要由少量的黑云母组成，这些黑云母位于玻璃态或结晶态钙、富铝辉石内。已对在Allan Hills 77307（CO3.03）中发现的相对较大（直径约120微米）的$^{26}$ Al- $^{26}$ Mg年代学以及岩相学和矿物学进行了研究。独特的是，无论是黑云母和辉石显示不一致的丰度短寿命现已灭绝的放射性核素$^{26}$铝，这表明不同的和不同的地区的黑云母和辉石的起源。该包裹体的原始岩相学和矿物学允许识别其成因和在黑云母-辉石/玻璃球粒中的蚀变趋势。
英文摘要：
10 Hibonite-pyroxene/glass spherules discovered hitherto are a rare suite of refractory inclusions that show the largest range of exotic isotopic properties (anomalies in neutron rich isotopes (e.g., $^{48}$Ca, $^{50}$Ti), abundance of $^{26}$Al) despite their defining simple spherical morphology and mineralogy consisting predominantly of few hibonites nestled within/with glassy or crystallised calcium, aluminium-rich pyroxene. $^{26}$Al-$^{26}$Mg chronological studies along with petrography and mineralogy of a relatively large (~120 micron diameter), found in Allan Hills 77307 (CO3.03) has been performed. Uniquely, both hibonite and pyroxene show discordant abundance of short-lived now-extinct radionuclide $^{26}$Al that suggest disparate and distinct regions of origin of hibonite and pyroxene. The pristine petrography and mineralogy of this inclusion allow discernment of their genesis and trend of alteration in hibonite-pyroxene/glass spherules.
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