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首页> 外文期刊>Quaternary geochronology >Grain size-dependent ~(10)Be concentrations in alluvial stream sediment of the Huasco Valley, a semi-arid Andes region
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Grain size-dependent ~(10)Be concentrations in alluvial stream sediment of the Huasco Valley, a semi-arid Andes region

机译：半干旱安第斯山脉地区Huasco山谷冲积河流沉积物中的粒度依赖性〜（10）Be浓度

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摘要

Terrestrial cosmogenic nuclide concentrations in sediment are used to quantify mean denudation rates in catchments. This article explores the differences between the ~(10)Be concentration in fine (sand) and in coarse (1-3 or 5-10cm pebbles) river sediment. Sand and pebbles were sampled at four locations in the Huasco Valley, in the arid Chilean Andes. Sand has ~(10)Be concentrations between 4.8 and 8.3·10~5atg~(-1), while pebbles have smaller concentrations between 2.2 and 3.3·10~5atg~(-1). It appears that the different concentrations, systematically measured between sand and pebbles, are the result of different denudation rates, linked with the geomorphologic processes that originated them. We propose that the ~(10)Be concentrations in sand are determined by the mean denudation rate of all of the geomorphologic processes taking place in the catchment, including debris flow processes as well as slower processes such as hill slope diffusion. In contrast, the concentrations in pebbles are probably related to debris flows occurring in steep slopes. The mean denudation rates calculated in the catchment are between 30 and 50m/Myr, while the denudation rates associated with debris flow are between 59 and 81m/Myr. These denudation rates are consistent with those calculated using different methods, such as measuring eroded volumes.
机译：沉积物中的陆地宇宙成因核素浓度用于量化集水区的平均剥蚀率。本文探讨了细（沙）和粗（1-3或5-10cm小卵石）河流沉积物中〜（10）Be浓度之间的差异。在干旱的智利安第斯山脉的瓦斯科山谷中的四个地点采样了沙子和鹅卵石。沙的〜（10）Be浓度在4.8和8.3·10〜5atg〜（-1）之间，而卵石的浓度在2.2和3.3·10〜5atg〜（-1）之间。似乎系统地测量了沙子和卵石之间的不同浓度是不同剥蚀率的结果，而剥蚀率与产生它们的地貌过程有关。我们认为，沙中〜（10）Be的浓度取决于流域内发生的所有地貌过程的平均剥蚀率，包括泥石流过程以及较慢的过程（如山坡扩散）。相反，卵石中的浓度可能与陡坡中发生的泥石流有关。在集水区计算的平均剥蚀率在30至50m / Myr之间，而与泥石流有关的剥蚀率在59至81m / Myr之间。这些剥蚀率与使用不同方法（例如测量侵蚀体积）计算出的剥蚀率一致。

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