在芬兰拉帕贾尔维冲击结构的冲击产生的热水循环期间深层微生物殖民,芬兰
Jacob Gustafsson1, Gordon R Osinski2, Nick M W Roberts3
1Department of Biology and Environmental Science, Linnaeus university, Kalmar, Sweden. jacob.gustafsson@lnu.se.
Nature communications
|September 17, 2025
概括
石撞击创造了持久的热水系统,使微生物生命成为可能. 这项研究确定了芬兰微生物殖民的日期.
科学领域:
- 天体生物学 天体生物学
- 地质化学 地质化学
- 地质时间学 (Geochronology)
背景情况:
- 石撞击结构是微生物生命的潜在息地.
- 将微生物殖民与冲击产生的热水系统联系在一起的证据很少.
- 对此类事件缺乏直接的地质年代学数据.
研究的目的:
- 为Lappajärvi冲击结构中微生物殖民提供时间约束.
- 将微生物活动与冲击产生的热水系统联系起来.
- 了解撞击后可居住性持续时间.
主要方法:
- 结合微观稳定同位素生物签名检测.
- 在撞击场所的折叠和断裂填充组件的放射性同位素测年.
- 分析矿物沉温度和同位素成分 (硫,碳).
主要成果:
- 在可居住温度 (47.0±7.1°C) 检测到的微生物活动,从大约73.6±2.2万年前开始.
- 早期的矿沉表明微生物硫酸盐减少 (34S-贫乏).
- 后来超过10亿年的矿物沉表明了无氧甲循环的证据.
结论:
- 石撞击产生了有利于微生物生命的长寿热水系统.
- 随着撞击坑的冷却,微生物殖民可能会持续下去.
- 这些发现对地球和其他行星上生命的起源和进化有影响.
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