在太阳系岩石中,具有最极端的正欧 ?? 异常的美索西德岩石石块是太阳系岩石中最极端的
概括
在石石中发现的石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石-石. 这些发现表明,复杂的,多阶段的火热过程发生在早期的太阳系小行星上.
科学领域:
- *行星科学 *行星科学
- * 地质化学 * 地质化学
- * 石化学 石化学
背景情况:
- * 半石是含有火性岩石石块的状石铁石.
- * 介于二氧化石中的石-石-石-石-石-石-石-石-石-石-石-石-石-石,表现出不寻常的地化学特征.
- *稀土元素 (REE) 分割模式提供了关于岩火和变态过程的见解.
研究的目的:
- * 分析来自 mesosiderites 的 pigeonite-plagioclase gabbro clast 中极度稀土元素 (REE) 分割.
- * 调查这些石中的梅里里石的REE模式及其与酸盐平衡的关系.
- *推断小行星母体上早期的岩火和变态过程.
主要方法:
- * 稀土元素 (REE) 度在加布罗岩石和梅里里石中的地质化学分析.
- * 观测到的REE模式与已知来自地球,月球和其他石母体的岩石和变态岩石进行比较.
- * 在早期太阳系过程的背景下对REE数据的解释.
主要成果:
- *加布罗石块显示了极端的REE分离,比以前已知的岩石具有更大的正欧异常.
- *轻型REE相对于重型REE显著耗尽,超过了可比累积gabros的耗尽.
- * 圆柱体内的美丽石表现出轻的REE耗尽和由于变态平衡而导致的大型正欧 ?? 异常.
结论:
- * 石石块中极端的REE比率表明太阳系早期的小行星上存在多阶段的火热过程.
- * 大规模地融,可能由撞击或太阳感应引发,可能推动了这些过程.
- *这些发现挑战了早期小行星演化和地形成的现有模型.
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