Cliff-foot sandy cones: A proxy to study the time frames, patterns and rates of sandstone caprock decay?

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Catena Pub Date : 2024-11-06 DOI:10.1016/j.catena.2024.108529
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Abstract

Constraining time frames, patterns and rates of sandstone caprock disintegration in tablelands under temperate climate remains challenging. This is due to the scarcity of material in the appropriate geomorphological context that could be dated. Sandy cones are widespread below the sandstone plateaus and may serve as a direct sedimentological evidence of caprock disintegration via subsurface erosion. However, they have not been utilised to their full potential. The paper presents the results of investigation of two sandy cones in the Stołowe Mountains tableland, SW Poland, and soil profiles developed within them. The study also included collecting material for charcoal 14C and single grain Optically Stimulated Luminescence (OSL) dating. Both soil profiles (Dystric Arenosols (Humic)) are dominated by sand fraction. The lens–like laminae of light-coloured sand and darker material enriched in organic matter result from changing sedimentation dynamics. Charcoals were found to be widespread and occur down to the bottom of the studied soil profiles. While they record some of the oldest fire events ever documented in the tableland (mostly from Preboreal and Boreal, in one case from the Younger Dryas), we show that they are inappropriate to determine the timing of sediment deposition because of long residence time in the fissure network. Contrarily, single grain OSL dating is far better suited to trace the sedimentological history of the cones that initiated 10.5 ± 1.5 ka ago. The overall sedimentation trends are similar, likely reflecting climate fluctuations throughout the Holocene and the impact of deforestation. Although sandy cones may serve as a universal geochronological proxy in sandstone tablelands under temperate climate, the patterns and rates at which they develop are site-specific and controlled primarily by local geomorphological and topographical circumstances, governing the efficiency of the sediment supply. This finding was supported by a novel approach to the analysis of FMM components.
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崖足砂锥:研究砂岩毛岩衰变的时间框架、模式和速率的替代物?
在温带气候条件下,确定台地砂岩毛岩崩解的时间框架、模式和速率仍然具有挑战性。这是因为在适当的地貌背景下,可以确定年代的材料很少。砂质圆锥体广泛分布于砂岩台地之下,可作为表岩通过地下侵蚀作用崩解的直接沉积证据。然而,它们并没有得到充分利用。本文介绍了对波兰西南部斯托沃韦山脉台地上的两个砂质圆锥体及其内部土壤剖面的调查结果。这项研究还包括收集材料进行木炭 14C 和单颗粒光致发光 (OSL) 测定。两个土壤剖面(Dystric Arenosols (Humic))都以沙粒为主。透镜状的浅色砂层和富含有机质的深色物质层是沉积动力学变化的结果。炭化现象在所研究的土壤剖面底部广泛存在。虽然炭化岩记录了台地上有记载的一些最古老的火灾事件(大多发生在前寒武纪和寒武纪,其中一个发生在少干纪中),但我们发现,由于炭化岩在裂隙网络中的停留时间较长,它们并不适于确定沉积物的沉积时间。相反,单颗粒OSL测年法更适合追溯始于10.5 ± 1.5 ka前的海锥沉积历史。总体沉积趋势相似,可能反映了整个全新世的气候波动和森林砍伐的影响。尽管砂质圆锥可作为温带气候下砂岩台地的通用地质年代替代物,但其形成的模式和速度是因地制宜的,主要受当地地貌和地形环境的控制,并制约着沉积物供应的效率。这一发现得到了一种新的方法的支持,该方法用于分析 FMM 的组成部分。
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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Effect of bedrock permeability on runoff and soil loss in soil-mantled karst slopes under successive rainfall conditions Effects of different land-use types on soil detachment capacity in loess areas Cliff-foot sandy cones: A proxy to study the time frames, patterns and rates of sandstone caprock decay? Relationship between soil structure and hydrological properties of the active layer in the permafrost region of the Qinghai–Tibet Plateau based on fractal theory Decadal trends of black carbon and heavy metal accumulation in a lake sediment core from central China: A historical perspective
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