一个异常的玄武岩石从最内在的主带
Philip A Bland1, Pavel Spurny, Martin C Towner
1IARC, Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK. p.a.bland@imperial.ac.uk
概括
最近的一颗石落下,与小行星4 Vesta不同,表明了玄武岩石的新来源. 它的轨道表明它起源于内主带,支持行星小进化模型.
科学领域:
- 行星科学 行星科学
- 太空化学 太空化学
- 天文学 天文学
背景情况:
- 大多数玄武岩石起源于小行星4 Vesta.
- 了解石的起源,可以了解太阳系早期的演变.
研究的目的:
- 为了调查一个基岩石的起源,具有不寻常的轨道特性.
- 为了探索与维斯塔无关的V型小行星前体的可能性,用于石.
主要方法:
- 对火球观测的三角测量,以确定石轨道和落位置.
- 氧同位素组成的分析.
- 轨道建模以推断石的母体起源.
主要成果:
- 最近的一颗石落下,其轨道特征和氧同位素与与4 Vesta相关的不同.
- 轨道建模表明,石起源于最内在的主小行星带.
- 母体可能是一个V型小行星,但与维斯塔无关.
结论:
- 玄武岩石的V型小行星前体可能存在于内主带,与4 Vesta分开.
- 这些发现与预测陆地行星区域中差异化小行星的形成和生存的模型一致.
- 这表明玄武岩石的起源比以前假设的更为多样化.
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