切割在安第斯山东高原在平世冷却期间的切割
Richard O Lease1, Todd A Ehlers
1Department of Geosciences, University of Tübingen, Tübingen, Germany. rlease@usgs.gov
概括
安第斯山脉的峡谷切割是由气候变化驱动的,而不仅仅是构造上的升起. 全球温度的降温增强了水分的运输,引发了普略世高原的峡谷形成.
科学领域:
- 地球科学 地球科学 地球科学
- 地质地质地质地质地质地
- 气候学 气候学 气候学
背景情况:
- 峡谷切口通常与构造表面升起有关.
- 然而,气候变化也可以推动峡谷的形成.
- 安第斯高原东部的特点是穿越主要变形区的深峡谷.
研究的目的:
- 调查沿安第斯高原东部峡谷切口的驱动因素.
- 区分构造学和气候影响对峡谷发展的影响.
- 建立该地区地质和气候事件的时间表.
主要方法:
- 利用 (U-Th) /He热年代学来确定地质事件的日期.
- 分析了断层和峡谷切口之间的空间和时间关系.
- 与古气候数据相关的地质发现,特别是海面温度.
主要成果:
- 在东北高原边缘记录了从米奥森断层转移到奥森峡谷切口的转移.
- 观察到广泛的普略世峡谷切口与全球气候从温暖转向冷却的转变相吻合.
- 在普略纪晚期的冷却过程中,确定了对高原的增强湿度传输.
结论:
- 气候变化,特别是新纪晚期的冷却,是峡谷切割的主要驱动因素.
- 海洋表面温度波动影响了水分传输,加快了峡谷的发展.
- 与气候相比,构造活动在普略纪峡谷切口中起的作用较小.
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