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科学家发现30亿年前月球仍“生机勃勃”

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科学家发现30亿年前月球仍“生机勃勃”

记者从中国科学院紫金山天文台获悉,近日,该台天体化学团队牵头对两块月球陨石开展了详细研究,首次揭示了月球在30亿年前的岩浆补给事件,为理解月球晚期的热演化历史提供了关键证据。相关研究近日在国际学术期刊《地球化学与宇宙化学学报》发表。

年轻的月海玄武岩是研究月球晚期火山活动的关键对象,科学界一般认为,自月球形成以来,其内部的玄武岩岩浆活动以简单结晶为主,缺乏类似地球岩浆房常见的动态过程。研究团队利用扫描电镜、电子探针等分析技术,对两块发现于2021年的月球陨石NWA 14526和NWA 14992开展了详细研究。

△月球陨石NWA14526和NWA14992的背散射电子图像及X射线元素面扫描图像

研究结果表明,这两块月球陨石在岩相结构、矿物成分、地球化学特征和结晶年龄上高度一致,具有成对关系,而且两者均呈现出独特的岩性二分性,即由富镁岩性和富铁岩性组成,研究团队认为这种罕见的岩性二分性是由岩浆补给作用驱动产生的。据此,研究团队提出了同源岩浆补给模型:约30亿年前,由月球内部早期侵入的富镁岩浆在岩浆房部分结晶后,又有一股演化的相对富铁岩浆“接力”注入,两者混合、反应,最终形成了两类岩性共存的结构。这是国际首次在月球样品中明确识别出岩浆补给过程。

一系列研究结果表明,月球虽然经历了长期的缓慢冷却过程,逐渐失去“生命力”,但在“生命”晚期(约30亿年前),其内部仍可能维持着动态的岩浆系统,存在岩浆补给、混合等复杂活动过程,表明月球“中年”乃至“晚年”的岩浆演化,远比过去设想的更加复杂而漫长。

(总台央视记者 帅俊全 褚尔嘉)返回搜狐,查看更多

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