稳定的同位素证据表明,通过地质时间增加了陆地生产力
Gregory J Retallack1, Ilya N Bindeman2
1Department of Earth Sciences, University of Oregon, Eugene, OR, 97403-1272, USA. gregr@uoregon.edu.
Scientific reports
|November 10, 2024
概括
稳定同位素分析显示,陆地和海洋的碳和氧组成在地质时间内有显著的分歧. 这些差异在陆地生命的重大创新和冰河时代达到顶峰,表明土地生产率增加.
科学领域:
- 地质化学 地质化学
- 古生物学的古生物学
- 地球科学 地球科学 地球科学
背景情况:
- 海洋生物的历史可以追溯到古代,而陆地生物的流行率较低.
- 土壤二氧化碳 (CO2) 中的稳定同位素提供了一种新的方法来研究前坎布里亚陆地生命.
- 土壤二氧化碳在碳和氧方面同位素上与海洋和火山二氧化碳不同.
研究的目的:
- 用稳定的同位素测试在陆地上的前坎布里亚时代生命的流行情况.
- 为了比较陆地碳酸盐的同位素组成与海洋记录.
- 为了研究氧气和碳同位素在陆地和海洋之间转移的驱动因素.
主要方法:
- 编译了以前发表的氧气和碳同位素数据,这些数据来自于pedogenic和paleokarst碳酸盐.
- 陆地碳酸盐同位素数据与同期海洋碳酸盐记录的比较.
- 对同位素组成的长期趋势和偶发变化的分析.
主要成果:
- 随着时间的推移,陆地碳酸盐中的氧同位素丰富,反映了海洋记录.
- 在陆地碳酸盐中的碳同位素中没有观察到显著的长期趋势.
- 氧气同位素丰富归因于较大大陆的蒸发和光合作用增加,而不是温度或低温度.
- 陆海同位素差异的偶发性增加与主要的陆地生命创新和冰河时代相关.
- 特定的陆地进化事件,如水,陆地植物,森林,木和草原的进化,与陆地生产力的高峰相对应.
结论:
- 对陆地碳酸盐的稳定同位素分析提供了对陆地生命历史的洞察.
- 大陆因素,如蒸发和光合作用显著影响氧同位素.
- 陆地和海洋同位素组成之间的分歧反映了陆地生态系统的主要进化里程碑.
- 同位素变化作为地面生产力和地球历史上进化事件的指标.
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