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沉积物参数控制海洋石的硫同位素组成

I Halevy¹, D A Fike², V Pasquier¹

¹Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel.

Science (New York, N.Y.)

|November 23, 2023

概括

硫酸盐过程的地理变化,而不是微生物分离,控制沉积物酸硫同位素 (δ34Spyr). 地球历史显示硫酸盐和氧气的增加影响了硫同位素的偏移.

科学领域:

地质化学
生物地化学循环
古代海洋学

背景情况:

沉积性化硫同位素组成 (δ34Spyr) 对于重建地球的碳,氧和硫循环至关重要.
了解控制 δ34Spyr 变异性的因素对于准确的古海洋学重建至关重要.

研究的目的:

在现代海洋沉积物中观察到的δ34Spyr广泛的主要驱动因素.
探索地球历史的影响,包括海水硫酸盐和氧气水平的变化,

主要方法:

沉积物生成模型的开发和应用.
全球沉积物参数数据集的整合.
对硫酸盐扩散,埋葬和微生物减少率的地理模式的分析.

主要成果:

硫酸盐运输和反应速率的地理变化,而不是微生物硫同位素分离,解释了广泛的 δ34Spyr 范围 (每毫米约100).
微生物的硫同位素分离在各种环境中始终大和均.
在地球历史上的海水硫酸盐和氧气度增加与日益增长的 δ34Spyr-硫酸盐偏移有关.

结论:

沉积物基因和硫酸盐地化学是现代 δ34Spyr 的主要控制因素.
海洋化学和氧化还原条件的长期变化对全球硫同位素循环产生了重大影响.
海平面的波动和超大陆周期可能会解释地球历史上较细的 δ34Spyr变化.

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