热度计揭示了高山景观中侵蚀的向前传播
David L Shuster1, Kurt M Cuffey, Johnny W Sanders
1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA. dshuster@bgc.org
概括
在过去的200万年里,世纪的冰川完全重塑了新西兰的Fiordland景观. 侵蚀模式表明,亚冰川侵蚀速度取决于冰的滑动速度,将气候和构造学联系起来.
科学领域:
- 地质形态学 地质形态学
- 冰川学的冰川学
- 构造学 构造学 构造学 构造学
背景情况:
- 冰川侵蚀塑造了山脉,并影响了地质物理现象.
- 对普莱斯托时代冰川的地形调整的时间和空间模式尚不清楚.
研究的目的:
- 在新西兰的菲奥德兰 (Fiordland) 调查地形演变,这是一个经典的冰川景观.
- 确定普莱斯托时代冰川对景观发展的影响.
主要方法:
- 使用 (U-Th) /He热度计来分析热度计数据.
- 在过去的200万年里重建的景观演变.
主要成果:
- 整个普莱斯托时代前的景观被侵蚀,地形从根本上重塑.
- 侵蚀集中在的山谷部分,从干谷传播到排水盆地头部.
- 观察到的侵蚀模式与冰下侵蚀取决于冰的滑动速度的模型保持一致.
结论:
- 普莱斯托时代的冰川侵蚀深刻地改变了费奥德兰的景观.
- 这些发现突出了气候,冰动态和地球表面形态之间的复杂相互作用.
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