14300万年海水同位素记录:火山运动和构造学的趋势,节奏和动态
Hironao Matsumoto1,2, Yasuto Watanabe3, Rodolfo Coccioni4
1Institute of Life and Environmental Sciences, University of Tsukuba, Ibaraki, Japan.
Science (New York, N.Y.)
|January 22, 2026
概括
大火性地区 (LIP) 喷发影响了古气候,奥斯 (Os) 同位素显示了大约1000万年周期. 这些周期与LIP活动相关,并表明大陆气候模式的变化.
科学领域:
- 地质化学
- 古气候学
- 同位素地质学
背景情况:
- 大火山区 (LIP) 通过构造和火山活动显著影响地球的古气候.
- (Os) 和 (Sr) 的同位素比率是大陆气候变化和LIP喷发事件的关键标志物.
- 量化古气候重建受到稀缺的白纪海水Os和河流Os-Sr数据的限制.
研究的目的:
- 建立从白纪到现在的长期同位素记录.
- 识别和分析Os同位素中的循环及其与LIP喷发的相关性.
- 重建过去的大陆气候模式和古地理变化.
主要方法:
- 在地质记录中分析 (Os) 和 (Sr) 的同位素比率.
- 从白纪到现在的长期同位素记录的开发.
- 同位素数据与已知的LIP喷发时间和古地理事件的相关性.
主要成果:
- 长期的同位素记录显示了白时期的1000万年至2000万年周期,与节奏性的LIP喷发保持一致.
- 海水的Os-Sr同位素趋势表明,在白纪晚期 (约90万年前) 和古世 (约35万年前) 的大陆气候模式发生了显著的变化.
- 这些气候模式的转变与大西洋的开放和喜马拉雅山脉的升起/冰化有关.
结论:
- 同位素记录是追踪长期LIP周期的有价值的工具.
- 奥斯同位素有助于确定地球历史上主要的古地理转折点.
- 这项研究提供了关于白时期和古老时期古气候和古地理动态的定量见解.
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