揭示了维玛断裂区 (大西洋中部) 的轮沉积系统
Dmitrii G Borisov1, Dmitry I Frey2,3, Elena V Ivanova2
1Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia. dborisov@ocean.ru.
研究人员在Vema断裂区发现了第一个轮沉积系统,挑战了以前关于沉积的假设. 这一发现凸显了底流对这条重要的大西洋通道的重大影响.
科学领域:
- 海洋地质 海洋地质学
- 海洋学 海洋学 海洋学
- 沉积物学的沉积物学
背景情况:
- 维玛断裂区是南极海底水分布在大西洋的关键通道.
- 尽管条件有利于轮岩的形成 (高沉积物输入,强的底流),但此前在该地区尚未确定过轮岩沉积物.
- 主流观点认为,平纪沉积主要归因于流.
研究的目的:
- 在维玛断裂区内识别和描述轮岩沉积系统.
- 挑战现有的度范式,挑战当前在该地区沉积物中的主导地位.
- 强调研究断裂区域的轮和重新评估底部电流影响的重要性.
主要方法:
- 高分辨率的下底造型,以绘制沉积物结构的地图.
- 数字建模以模拟当前动态.
- 底部电流速度的直接测量.
主要成果:
- 在Vema断裂区中发现了轮岩沉积系统的第一个证据.
- 这一发现与长期以来的信念相矛盾,即度电流完全主导了沉积.
- 已经证实,在断裂区域设置中存在形系统,尽管可能不常见.
结论:
- 在维玛断裂区存在直径沉积系统,需要对区域沉积过程进行重新评估.
- 底部电流的作用比以前认为的要大得多,特别是在狭窄的断裂区段.
- 对维玛断裂区的轮岩和混合沉积系统的进一步研究至关重要.
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