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自20世纪60年代“莫霍计划”因资金缺乏被迫中止后,搁置了人类钻透完整海洋地壳,进入地幔的科学使命。尽管全球科学家力图尝试,但至今远未真正钻穿“莫霍面”——地壳与地幔的分界线。如今,这个任务即将由中国新一代深海钻探船“梦想号”接力完成。它在2024年正式服役,是目前全球唯一有望钻穿洋壳的最先进的科研钻探平台。

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    自20世纪60年代“莫霍计划”因资金缺乏被迫中止后,搁置了人类钻透完整海洋地壳,进入地幔的科学使命。尽管全球科学家力图尝试,但至今远未真正钻穿“莫霍面”——地壳与地幔的分界线。如今,这个任务即将由中国新一代深海钻探船“梦想号”接力完成。它在2024年正式服役,是目前全球唯一有望钻穿洋壳的最先进的科研钻探平台。

    . 为什么一定要钻穿完整洋壳. 科技导报, 2025 , 43 (7) : 10 -10 .
    . Science & Technology Review, 2025 , 43 (7) : 10 -10 .
    自20世纪60年代“莫霍计划”因资金缺乏被迫中止后,搁置了人类钻透完整海洋地壳,进入地幔的科学使命。尽管全球科学家力图尝试,但至今远未真正钻穿“莫霍面”——地壳与地幔的分界线。如今,这个任务即将由中国新一代深海钻探船“梦想号”接力完成。它在2024年正式服役,是目前全球唯一有望钻穿洋壳的最先进的科研钻探平台。
    “我们并不真正了解海洋地壳的构成。”中国地质大学教授牛耀龄挑战现有的假设,即过去人们普遍认为,海洋地壳是由凝固的岩浆构成的,但新的证据显示,大量“地壳”其实是蛇纹石化的地幔残余物。这种误解源于过度依赖地震数据的“便利性假设”,而不是基于实地样本。
    目前对地震数据的解释认为全球海洋地壳厚度均一,为(6±1)km,但这与实际钻探岩心中复杂的岩石组合相悖。特别是在大西洋慢速扩张洋脊,钻探多次揭示所谓“地壳”实为以蛇纹岩为主的岩石,远非岩浆生成的玄武岩或辉长岩。这也意味着,人们对板块构造理论的核心环节——洋壳的生成机制——仍然存在盲点。牛教授强调钻穿洋壳的必要性,提出在快速扩张洋脊形成的洋壳优选钻探靶区,通过原位取样建立地震波速与岩石类型的精确对应关系。
    “梦想号”的建造,正是为此而生。这艘中国具有自主知识产权的钻探船,不仅能抵御16级风暴,还可深入海底11000 m以下,具备长达120天连续作业的能力。中国希望借此与全球科学界一道,重新点燃“莫霍计划”的火种。全球地质学家在2024年底齐聚广州,研讨如何最好地利用“梦想号”完成这场“地质界阿波罗登月”般的壮举。
    “我们必须坚持实现这一科学使命。”牛耀龄教授表示,“只有亲自钻穿海底拿到样本,我们才能真正理解地壳的本质,完成板块构造理论的最后拼图。”最终获得的实验数据,将改进洋脊扩张速率与地震活动性预测模型,同时也可带动硬岩钻探的装备和技术的针对性升级。
    (来源于中国科技期刊卓越行动计划入选期刊:《Geoscience Frontiers》,2025,16(1))

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    Percentage of
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    species (%)
    鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
    小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
    多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
    红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
    小菇属 Mycena 11 5.26
    光柄菇属 Pluteus 5 2.39
    红菇属 Russula 17 8.13
    栓菌属 Trametes 5 2.39
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