来自原始石的已灭绝的 (129) I 化物:证据表明太阳系早期的蒸发物形成
1Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK. Department of Mineralogy, Natural History Museum, London, SW7 5BD, UK.
概括
扎格石中的酸盐晶体含有纯色-129,表明太阳系的早期形成. 这一发现表明,矿在太阳系形成后不久,从水性流体中迅速形成.
科学领域:
- 宇宙化学 宇宙化学
- 行星科学 行星科学
- 同位素地球化学 同位素地球化学
背景情况:
- 早期的太阳系材料为我们太阳系的形成和演变提供了洞察力.
- 短寿命同位素如-129 ((129) I) 的放射性衰变是早期太阳系事件的关键计时器.
- 同位素,特别是-129 ((129) Xe),是了解核合成和早期太阳系过程的关键标记物.
研究的目的:
- 为了研究Zag H3-6地质中化物形成的起源和时间.
- 为了确定早期太阳系中最初的-129与-127 ((129) I/(127) I) 的比率.
- 为了限制与太阳系最古老的材料相比,岩石的形成时间尺度.
主要方法:
- 对同位素的分析,特别是 (129) Xe,来自Zag H3-6合石的化物晶体内.
- 相关释放实验涉及从中子辐射 (127) I.I.中自然发生的 (129) Xe和人工产生的 (128) Xe.
- 使用 (129) I 到 (129) Xe 的衰变进行放射测年.
主要成果:
- 化物晶体基本上含有纯净的,单同位素 (129) Xe,归因于早期太阳系的衰变 (129) I.I.
- 最初的 (129) I / 127) I 比率被确定为 (1.35 +/- 0.05) x 10),与原始太阳系值相一致.
- (129) Xe的存在表明,矿是由已知最古老的太阳系矿物质在200万年内从水性流体中形成的.
结论:
- 扎格石中的酸盐作为早期太阳系核合成和时间的记录器.
- 石的快速形成表明了早期太阳星云中挥发性物质的高效处理.
- 这项研究完善了早期太阳系过程的时间表和特定矿物阶段的形成.
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