2022年12月23日

嫦娥五号样品中外来岩屑指示月球上仍存在未被认识的地质单元

中新社贵阳12月23日电 (记者 蒲文思 杨茜)中国科学院地球化学研究所23日披露,该所科研团队日前通过对嫦娥五号月壤中的岩石碎屑开展研究,获得了嫦娥五号年轻玄武岩单元上的外来岩石碎屑组成信息,并发现特殊的月球岩石和火山碎屑,为揭示月壳组成多样性及岩浆活动多样性提供了证据,该项研究指示了月球上仍存在未被认识的地质单元,这能为规划未来月球采样或遥感探测任务提供科学支撑。这一研究成果近日在行星科学国际期刊《自然·天文》(《Nature Astronomy》)上发表。

  嫦娥五号着陆区为20亿年前形成的中钛玄武岩单元,嫦娥五号月壤为研究月球年轻地质单元上物质改造和物质组成提供了新的时间窗口。由于月球表面长期遭受小天体的撞击改造作用,月表物质不断被破碎、翻耕、迁移、混合,使得嫦娥五号采样区的月壤中含有一定量其它区域的溅射物。理论计算和遥感分析结果估计嫦娥五号着陆区含有大于10%至20%的其他区域物质,但是,嫦娥五号月壤中外来岩屑(月球其他区域溅射到嫦娥五号采样区的物质)的贡献是多少?是否含有特殊的月壳岩石碎屑?这些外来岩屑对月壳演化有什么指示?仍不清楚,这些问题的答案,能为认识月壳年轻地质单元的月壤翻耕迁移过程、月壳岩石组成多样性、月壳地质演化等提供制约信息。

  中国科学院地球化学研究所曾小家博士、李雄耀研究员和刘建忠研究员通过分析了超过3000颗嫦娥五号月壤颗粒,识别出了7颗不同于嫦娥五号中钛玄武岩的火成岩碎屑,包括:高钛玻基斑状岩石碎屑、低钛玄武岩碎屑,橄榄辉石岩碎屑、镁质斜长岩碎屑、高度演化岩石碎屑、富镁橄榄石碎屑和火山玻璃碎屑。基于这些岩屑的岩石学、矿物学和地球化学数据,分析并讨论了其成因、与阿波罗(Apollo)岩石的异同、来源、地质意义等。

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