Tectonic and erosional controls of sediment residence time in small catchments draining an active mountain range: Evidence from uranium comminution age
文献类型：期刊论文
| 作者 | Li, Le4; Li, Gen K.3; Chen, Jun2; Hedding, David William1; Li, Gaojun2 |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2024-09-15 |
| 卷号 | 381页码:12-24 |
| 关键词 | Eastern Tibetan Plateau Uranium comminution age Sediment residence times Carbon cycle Erosion Chemical weathering |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2024.07.031 |
| 通讯作者 | Li, Gaojun(ligaojun@nju.edu.cn) |
| 英文摘要 | Sediment residence time (SRT) is a key parameter of the Earth's surface system, bridging the realms of sediment transport, biogeochemical cycles, sedimentary archives, and watershed management. SRT in mountainous catchments includes the time particles have spent in the subsurface weathering zone, which has been challenging to measure thus limiting our understanding of the magnitude and controlling factors of SRT in steep terrains. In this study, we apply the 234U/238U activity ratio, (234U/238U), which reveals particle comminution age, to estimate SRTs in 32 catchments (drainage area of 6.79-143.67 km2) draining an active mountain range at the eastern margin of the Tibetan Plateau. The uranium comminution age allows us to account for the time that particles have spent in the weathering zone. The sampled catchments span a range of erosional, topographic, climatic and lithologic conditions, providing a unique opportunity to explore the controlling factors on SRTs. We measured the (234U/238U) of the 20-25 mu m size fraction of the collected riverbed sediment samples and used the results to calculate particle comminution ages, which are used to approximate SRTs of fine sediment in the catchment. We then investigated the relationships between estimated SRTs and denudation rates, topography, climate, and lithology to assess controls on SRTs. The estimated SRTs range from 5.0 to 149.2 ka, and exhibit strong negative correlations with the 10Be-derived denudation rates and metrics for landscape steepness (relief, gradient, and channel steepness), with weak-to-moderate correlations with climatic and lithologic conditions. By combining the SRTs and denudation rates and assuming a steady-state weathering zone, we estimate a catchment-average comminution depth of 1.98 to 28.7 m, comparable to the depth of weathering zone estimated from modeling studies. Considering a topographic steady-state where denudation rates are in equilibrium with uplift rates, our results suggest that tectonic uplift exerts a primary control on the SRT in active mountain ranges, such that faster uplift rates shorten SRTs. Our findings suggest that tectonic uplift could regulate the temporal duration of chemical weathering by limiting the SRTs of fresh minerals in mountainous regions, sustaining a 'kinetically-limited' weathering scenario. |
| WOS关键词 | SERIES ISOTOPES ; COSMOGENIC NUCLIDES ; SEASONAL-VARIATIONS ; WEATHERING RATES ; RIVER SEDIMENTS ; SOIL PRODUCTION ; ORGANIC-CARBON ; TRANSPORT ; UPLIFT ; FRACTIONATION |
| 资助项目 | National Natural Science Foundation of China[42325302] ; National Natural Science Foundation of China[42103001] ; Fundamental Research Funds for the Central Universities-Cemac GeoX Interdisciplinary Program[2024ZD01] ; Taishan Scholars Program ; National Post-doctoral Program of China for Innovative Talents[BX20200163] ; UCSB Regent's Junior Faculty Fellowship |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001285841400001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/196518]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Li, Gaojun |
| 作者单位 | 1.Univ South Africa, Dept Geog, Pioneer Ave, ZA-1710 Florida, South Africa 2.Nanjing Univ, MOE Key Lab Surficial Geochem & Frontiers Sci Ctr, Nanjing 210023, Peoples R China 3.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA 4.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Le,Li, Gen K.,Chen, Jun,et al. Tectonic and erosional controls of sediment residence time in small catchments draining an active mountain range: Evidence from uranium comminution age[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2024,381:12-24. |
| APA | Li, Le,Li, Gen K.,Chen, Jun,Hedding, David William,&Li, Gaojun.(2024).Tectonic and erosional controls of sediment residence time in small catchments draining an active mountain range: Evidence from uranium comminution age.GEOCHIMICA ET COSMOCHIMICA ACTA,381,12-24. |
| MLA | Li, Le,et al."Tectonic and erosional controls of sediment residence time in small catchments draining an active mountain range: Evidence from uranium comminution age".GEOCHIMICA ET COSMOCHIMICA ACTA 381(2024):12-24. |
入库方式： OAI收割
来源：海洋研究所
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