Centennial- to millennial-scale hard rock erosion rates deduced from luminescence-depth profiles

Centennial- to millennial-scale hard rock erosion rates deduced from luminescence-depth profiles
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从发光深度剖面推导出百年至千年尺度的硬岩侵蚀率

DOI:
10.1016/j.epsl.2018.04.017
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发表时间:
2018-07
影响因子:
5.3
通讯作者:
Benny Guralnik
Benny Guralnik
中科院分区:
地球科学1区
文献类型:
--
作者:
Reza Sohbati;Jinfeng Liu;Mayank Jain;Andrew Murray;David Egholm;Richard Paris;Benny Guralnik

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在不同的地貌环境和不同的时空尺度上测量侵蚀和风化速率是地球表面过程速率和模式量化的基础。了解这些地表过程的速率有助于人们解读它们对景观演化的相对贡献——这些信息对于理解气候、构造和景观之间的相互作用至关重要。因此,人们开发了多种技术来确定短期(< 102a)和长期(104a)侵蚀速率。然而,没有方法可以量化百年至千年时间尺度上的硬岩侵蚀速率。在这里,我们提出了一种新的技术,基于太阳漂白的发光信号深入岩石表面,以弥补这一分析差距。我们将我们的技术应用到中国东部帕米尔高原的冰川和滑坡巨石上。本研究中取样的8块巨石中,有7块光滑表面的计算侵蚀率在< 0.038±0.002至1.72±0.04 mm ka - 1之间变化(第8块巨石的侵蚀率异常高,可能是由于最近的表面碎裂/开裂损失)。考虑到这种光滑表面的优先采样,假设是由颗粒间的表面损失引起的,我们认为这些速率是中国东帕米尔高原岩石表面剥蚀速率的最小估计。
The measurement of erosion and weathering rates in different geomorphic settings and over diverse temporal and spatial scales is fundamental to the quantification of rates and patterns of earth surface processes. A knowledge of the rates of these surface processes helps one to decipher their relative contribution to landscape evolution–information that is crucial to understanding the interaction between climate, tectonics and landscape. Consequently, a wide range of techniques has been developed to determine short-(< 10 2 a) and long-term (> 10 4 a) erosion rates. However, no method is available to quantify hard rock erosion rates at centennial to millennial timescales. Here we propose a novel technique, based on the solar bleaching of luminescence signals with depth into rock surfaces, to bridge this analytical gap. We apply our technique to glacial and landslide boulders in the Eastern Pamirs, China. The calculated erosion rates from the smooth varnished surfaces of 7 out of the 8 boulders sampled in this study vary between< 0.038±0.002 and 1.72±0.04 mm ka− 1 (the eighth boulder gave an anomalously high erosion rate, possibly due to a recent chipping/cracking loss of surface). Given this preferential sampling of smooth surfaces, assumed to arise from grain-by-grain surface loss, we consider these rates as minimum estimates of rock surface denudation rates in the Eastern Pamirs, China.
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