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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Centennial- to millennial-scale hard rock erosion rates deduced from luminescence-depth profiles
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Centennial- to millennial-scale hard rock erosion rates deduced from luminescence-depth profiles

机译：百年 - 从发光深度配置文件推断出千禧一代的硬岩侵蚀率

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摘要

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. (C) 2018 Elsevier B.V. All rights reserved.
机译：不同地貌环境和多种时间和空间尺度的侵蚀和风化速率的测量是对地球表面过程的速率和模式的量化的基础。对这些表面流程的速率的了解有助于一个人破译他们对景观演变的相对贡献 - 了解气候，构造和景观之间的相互作用至关重要。因此，已经开发了广泛的技术来确定短 - （＆lt 19（2））和长期（＆ 10（4））侵蚀率。然而，没有任何方法可用于量化百年期至千禧一代的时间粒度。在这里，我们提出了一种新颖的技术，基于具有深度进入岩石表面的发光信号的太阳能漂白，以弥合这种分析间隙。我们将技术应用于中国东部帕米尔斯的冰川和滑坡巨石。在本研究中采样的8个巨石中的7个中的光滑漆面的计算腐蚀速率在该研究中的7型巨石中的50％和1.72 +/- 0.04 mm Ka（第八块）（第八架巨石）给予异常高侵蚀可能是由于最近的碎裂/裂缝的表面损失）。考虑到这种优先的光滑表面采样，假设从谷粒表面损失引起，我们认为这些速率作为中国东部帕米尔斯岩石表面剥削速率的最低估计。 （c）2018年elestvier b.v.保留所有权利。

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