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arXiv 1409.3853astro-ph.EP
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Semarkona:球粒陨石和球粒陨石形成的教训

Semarkona: Lessons for chondrule and chondrite formation

Alexander Hubbard, Denton S. Ebel

摘要:

我们认为LL3.0球粒陨石Semarkona,包括它的球粒分数,球粒尺寸分布和基质热历史的证据。我们表明,不超过一个温和的比例,在太阳星云的环境基质材料可能已被熔化成球粒;和许多未处理的基质材料必须已被过滤出在某些阶段的Semarkona的母体形成过程。我们的结论是,在太阳星云中一定形成了许多球粒的聚集体,这意味着球粒和基质颗粒具有相当不同的碰撞粘附参数。此外,我们注意到,在Semarkona没有大的熔融物体意味着球粒必须迅速退出熔融区,在球粒凝聚物形成之前。对这种快速退出的最简单的解释是球粒熔化发生在盘的表层。新形成的致密球粒在短时间内从这些层中沉淀出来。

英文摘要:

We consider the evidence presented by the LL3.0 chondrite Semarkona, including its chondrule fraction, chondrule size distribution and matrix thermal history. We show that no more than a modest fraction of the ambient matrix material in the Solar Nebula could have been melted into chondrules; and that much of the unprocessed matrix material must have been filtered out at some stage of Semarkona's parent body formation process. We conclude that agglomerations of many chondrules must have formed in the Solar Nebula, which implies that chondrules and matrix grains had quite different collisional sticking parameters. Further, we note that the absence of large melted objects in Semarkona means that chondrules must have exited the melting zone rapidly, before the chondrule agglomerations could form. The simplest explanation for this rapid exit is that chondrule melting occurred in surface layers of the disk. The newly formed, compact, chondrules then settled out of those layers on short time scales.

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