在阿根廷的帕帕帕地区,可能存在着一个石散布的田野
P A Bland1, C R de Souza Filho, A J T Jull
1Planetary and Space Sciences Research Institute, The Open University, Milton Keynes MK7 6AA, UK. p.a.bland@open.ac.uk
概括
研究人员调查了阿根廷的玻璃碎片,最初被认为是撞击弹射. 新的发现表明,玻璃是tektite,可能来自0.48万年前的撞击事件,创造了一个新的散布场.
科学领域:
- 地质地质地质地质地质地
- 地质物理学 地质物理学
- 行星科学 行星科学
背景情况:
- 阿根廷帕佩平原的长长的低谷以前被解释为撞击事件的证据.
- 相关的撞击玻璃表明,近距离喷射来自高度斜的撞击.
研究的目的:
- 重新评估庞佩平原延长形状和相关玻璃的起源.
- 为了确定玻璃碎片是否代表撞击喷射物或tektites.
主要方法:
- 地质绘图用于识别和表征延长的特征.
- 玻璃碎片的地质年代测定.
- 玻璃时代和组成与已知tektite散布的领域的比较.
主要成果:
- 确定了大约400个额外的长长的特征,表现出岩 (风吹) 起源的特征,而不是冲击.
- 来自Rio Cuarto低谷的玻璃碎片的约会产生了与800公里外的玻璃相一致的年龄.
- 玻璃很可能是石材料,这表明大约在0.48万年前发生了重大撞击事件.
结论:
- 长长的低谷主要是有岩起源的.
- 玻璃碎片代表了tektites,而不是来自局部冲击的近距离喷射物.
- 这些发现表明,在南半球发现了一个新的tektite散布场,与一个约0.48万年前的撞击事件有关.
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