The oxygen isotope composition of Almahata Sitta
The oxygen isotope composition of Almahata Sitta
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DOI：
10.1111/j.1945-5100.2010.01099.x
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发表时间：
2010-03
影响因子：
2.2
通讯作者：
D. Rumble;M. Zolensky;J. Friedrich;P. Jenniskens;M. Shaddad
中科院分区：
文献类型：
--
作者：
D. Rumble;M. Zolensky;J. Friedrich;P. Jenniskens;M. Shaddad
对阿尔马哈塔陨石(AHS)的11个碎片进行了氧同位素分析。这些碎片是作为单独的石头从努比亚沙漠陨石的线性散布区域单独收集的。每个碎片代表了小行星2008TC3的不同和不同部分的样本。其中10个碎片跨越了相同范围的δ18O、δ17O和Δ17O的值范围，并沿着碳质球粒陨石无水矿物(CCAM线)遵循与辉绿岩陨石家族的单组分和多组分成员相同的趋势。25号碎块的氧同位素组成与H5普通球粒陨石在岩石学上的相似性一致。我们的结果表明，单个小型小行星母体--小行星2008TC3，长度只有4米，涵盖了单粒和多粒陨石测得的氧同位素组成的整个变化范围。
Abstract– Eleven fragments of the meteorite Almahata Sitta (AHS) have been analyzed for oxygen isotopes. The fragments were separately collected as individual stones from the meteorite’s linear strewn field in the Nubian Desert. Each of the fragments represents a sample of a different and distinct portion of asteroid 2008 TC3. Ten of the fragments span the same range of values of δ18O, δ17O, and Δ17O, and follow the same trend along the carbonaceous chondrite anhydrous minerals (CCAM) line as monomict and polymict members of the ureilite family of meteorites. The oxygen isotope composition of fragment #25 is consistent with its resemblance petrographically to an H5 ordinary chondrite. Our results demonstrate that a single small asteroidal parent body, asteroid 2008 TC3, only 4 m in length, encompassed the entire range of variation in oxygen isotope compositions measured for monomict and polymict ureilites.