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19 小时
南极冰架融水池塘揭示雪球地球时期真核生物避难所的生物标志物特征
南极麦克默多冰架的"波浪冰"景观为破解这一谜题提供了天然实验室。这片被深色冰碛物覆盖的冰架表面,分布着数百个季节性融水池塘,底部沉积物上生长着以蓝藻垫为核心的复杂微生物群落。这些池塘的物理化学条件(如盐度梯度)与假想的雪球地球避难所高度相似,其微生物垫中封存的生物标志物和遗传信息,成为解读远古生命密码的钥匙。
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