Talus accumulation and Rockwall retreat, Trotternish, isle of Skye, Scotland
Talus accumulation and Rockwall retreat, Trotternish, isle of Skye, Scotland
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距骨堆积和岩墙撤退，特罗特尼什，斯凯岛，苏格兰
DOI：
10.1080/00369229918737057
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发表时间：
1999
影响因子：
1
通讯作者：
C. Ballantyne
中科院分区：
文献类型：
--
作者：
S. Hinchliffe;C. Ballantyne
基于玄武岩崖脚的距骨堆积体积的计算表明，自17.5 Cal ka BP冰川消退以来，岩壁退缩了4.3-7.8 m（平均5.6 m），这意味着在过去的17,500年中，岩壁的平均退缩率为0.25-0.45 m ka - 1（平均0.32 m ka"'）。talus沉积物的组成表明，大约70%的悬崖退缩反映了岩崩，其余的是由于表面的颗粒风化作用。然而，根据放射性碳定年的土壤层位，距骨内的岩崩在11.5 Cal ka BP以来非常有限，这意味着大约80%的岩壁退缩发生在17.5 Cal ka BP至11.5 Cal ka BP之间。据估计，这一时期岩壁退缩率平均为0.75 m ka”1。这种相对较高的悬崖退缩率可能反映了冰缘条件下冰川消融和/或霜冻破碎后的压力释放。目前的利率是…
Abstract Calculations based on the volume of talus accumulations at the foot of a basalt cliff indicate that 4.3–7.8 m (mean 5.6 m) of rockwall retreat has occurred since deglaciation at 17.5 Cal ka BP, implying average rockwall retreat rates of 0.25–0.45 m ka‐1 (mean 0.32 m ka"') over the last 17,500 years. The composition of the talus sediments indicates that approximately 70 % of total cliff retreat reflects rockfall, and that the remainder has been due to granular weathering of the face. However, radiocarbon‐dated soil horizons within the talus suggest that rockfall has been very limited since the end of the Loch Lomond Stade at c. 11.5 Cal ka BP, implying that about 80% of total rockwall retreat occurred between 17.5 Cal ka BP and 11.5 Cal ka BP. Rockwall retreat rate during this period is estimated to have averaged c. 0.75 m ka"1. This relatively high rate of cliff recession probably reflects stress release following deglaciation and/or frost shattering under periglacial conditions. Current rates of...