野性2号彗星和巨型星团IDP中低钙辉石来源的成分证据

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
D. J. Joswiak, D. E. Brownlee, A. J. Westphal, Z. Gainsforth, M. Zhang, N. T. Kita
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引用次数: 0

摘要

对来自 12 个原始 2-3 型碳质、普通和恒星陨石组软玉的 1136 个低碳辉石成分进行了文献汇编,与来自平衡 4-6 型软玉的低碳辉石相比,确定了 Al2O3 和 Cr2O3 图上的独特区域。从 Wild 2 号彗星和一个可能源自彗星的巨型星团 IDP 测得的 100 个低钙辉石的成分彼此相似,都属于 2-3 型软玉区域,这表明大多数辉石可能像传统软玉一样在太阳星云中形成。这些数据表明,野性2号彗星和巨型星团IDP中的大多数低钙辉石是在火成岩结晶过程中形成的,并没有经历明显的热变质作用,这表明低钙辉石在吸积到各自的彗体之前不太可能融入大型母体中。野性 2 号彗星上的九种低钙辉石具有低铬和低铝的特征,它们落在 4-6 型软玉体所在的位置,被解释为冷凝的产物。这些成分数据与之前测量到的 17 个低钙辉石的氧同位素相结合,支持了之前的结论,即彗星样本与碳质、普通和可能的恒星型软玉有联系。我们的研究结果提供了更多证据,证明彗星从整个太阳星云的多个软玉储层中吸积物质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Compositional evidence for chondrule origins of low-Ca pyroxenes in comet Wild 2 and a giant cluster IDP

A literature compilation of 1136 low-Ca pyroxene compositions from chondrules from 12 primitive type 2–3 carbonaceous, ordinary and enstatite chondrite groups define unique regions on an Al2O3 and Cr2O3 diagram when compared to low-Ca pyroxenes from equilibrated type 4-6 chondrites. Measured compositions of 100 low-Ca pyroxenes from comet Wild 2 and a giant cluster IDP of probable cometary origin are similar to each other and fall in the type 2–3 chondrite chondrule region suggesting that most of the pyroxenes likely formed in the solar nebula like conventional chondrules. The data imply that most low Ca-pyroxenes from comet Wild 2 and the giant cluster IDP formed from igneous crystallization processes and did not experience significant thermal metamorphism, indicating that the low-Ca pyroxenes were unlikely incorporated into large parent bodies prior to accretion in their respective comet bodies. An intriguing group of nine low-Ca pyroxenes from comet Wild 2 with low Cr and Al that fall where type 4–6 chondrites are located are interpreted as products of condensation. The compositional data combined with previously measured oxygen isotopes on 17 low-Ca pyroxenes support earlier conclusions that comet samples have links with carbonaceous, ordinary, and possibly enstatite chondrite groups. Our results provide additional evidence that comets accreted materials from multiple chondrule reservoirs throughout the solar nebula.

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来源期刊
Meteoritics & Planetary Science
Meteoritics & Planetary Science 地学天文-地球化学与地球物理
CiteScore
3.90
自引率
31.80%
发文量
121
审稿时长
3 months
期刊介绍: First issued in 1953, the journal publishes research articles describing the latest results of new studies, invited reviews of major topics in planetary science, editorials on issues of current interest in the field, and book reviews. The publications are original, not considered for publication elsewhere, and undergo peer-review. The topics include the origin and history of the solar system, planets and natural satellites, interplanetary dust and interstellar medium, lunar samples, meteors, and meteorites, asteroids, comets, craters, and tektites. Our authors and editors are professional scientists representing numerous disciplines, including astronomy, astrophysics, physics, geophysics, chemistry, isotope geochemistry, mineralogy, earth science, geology, and biology. MAPS has subscribers in over 40 countries. Fifty percent of MAPS'' readers are based outside the USA. The journal is available in hard copy and online.
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