Climate Change Data Portal
| DOI | 10.1002/esp.5831 |
| A 121-ka record of Western Andean fluvial response to suborbital climate cycles recorded by rhythmic grain size variations of the Lima fluvial fan | |
| 发表日期 | 2024 |
| ISSN | 0197-9337 |
| EISSN | 1096-9837 |
| 英文摘要 | A complete, fluvial stratigraphic record for the last glacial period of the Western Andes in Peru is not available due to preservation issues and spatial variability in sedimentation. Deposits are typically restricted to incomplete records of fluvial terraces or localised occurrences of alluvial fans and landslides. These landforms are thought to have formed under a regime of climate cyclicity controlling increases in precipitation. Because of the fragmented preservation of these deposits, as well as dating uncertainties, it remains unclear if orbital climate cycles, such as the precession cycle, or suborbital cycles, such as the wet Heinrich events, are driving Andean sedimentation. In this paper, we try to answer this question through a sedimentological-stratigraphical analysis of a much more complete sedimentary sequence than usually found in the region. We present the results of a grain size analysis of 5000 clasts and 13 new luminescence ages of a 52-m-long, stratigraphic section of the Lima fluvial fan in Peru. Bayesian age-depth modelling resulted in a robust chronostratigraphic framework and derived sedimentation rates. The stratigraphic record registered sedimentation from 121.7 +/- 4 to 6.3-1.6+1.5$$ {6.3}_{-1.6}<^>{+1.5} $$ ka. Three major sedimentation periods occurred between 121.7 to 110-5+4$$ {110}_{-5}<^>{+4} $$, 87 +/- 1 to 67-3+2$$ {67}_{-3}<^>{+2} $$, and 31-3+4$$ {31}_{-3}<^>{+4} $$ to 6.3-1.6+1.5$$ {6.3}_{-1.6}<^>{+1.5} $$ ka. These periods registered various unconformities and coarsening-fining upward sequences which chronologically correlate to suborbital pluvial periods, recognised from speleothems and lake records, that drove fluvial deposition. They also correlate with the timing of other recognised sedimentation events throughout the Western Andes. Marine regression resulted in fan progradation and not in incision. The Lima fan stratigraphy represents therefore the most complete, last glacial fluvial record for the Peruvian Western Andes to date and it highlights the potential of fluvial fans as recorders of suborbital climate variability. Our study presents a detailed stratigraphic analysis of the Lima fluvial fan, offering the most complete, last glacial alluvial record to date for the Peruvian Andes. Using grain size analysis and luminescence dating, three major sedimentation periods containing numerous coarsening upward sequences were identified and correlated with suborbital pluvial periods. The findings suggest that suborbital, rather than orbital, climate variability was the primary driver of sedimentation, providing new insights into the formation of the geological substrate beneath Peru's capital city. image |
| 英文关键词 | Andes; climate change; fluvial; luminescence dating; Peru; quaternary |
| 语种 | 英语 |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001196773600001 |
| 来源期刊 | EARTH SURFACE PROCESSES AND LANDFORMS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/306233 |
| 作者单位 | Pontificia Universidad Catolica del Peru; Universidade da Coruna |
| 推荐引用方式 GB/T 7714 | . A 121-ka record of Western Andean fluvial response to suborbital climate cycles recorded by rhythmic grain size variations of the Lima fluvial fan[J],2024. |
| APA | (2024).A 121-ka record of Western Andean fluvial response to suborbital climate cycles recorded by rhythmic grain size variations of the Lima fluvial fan.EARTH SURFACE PROCESSES AND LANDFORMS. |
| MLA | "A 121-ka record of Western Andean fluvial response to suborbital climate cycles recorded by rhythmic grain size variations of the Lima fluvial fan".EARTH SURFACE PROCESSES AND LANDFORMS (2024). |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
