Weathering under coastal hyperaridity – Assessing spectral, textural, and gravelometric alluvial fan surface characteristics using high resolution remote sensing
This page lists all metadata that was entered for this dataset. Only registered users of the CRC1211DB may download this file.
Feature
Request download
Citation
Citation Options
Identification
| Title: | Main Title: Weathering under coastal hyperaridity – Assessing spectral, textural, and gravelometric alluvial fan surface characteristics using high resolution remote sensing |
| Description: | Abstract: Physical and chemical weathering processes along hyperarid coasts differ distinctly from those present in inland deserts due to the abundance of air humidity and sea salt aerosols. However, the geomorphic effects of the weathering processes as well as the timescales on which alteration of the depositional surfaces occur are only poorly understood. Based on high to very high resolution satellite (2 m) and aerial (~1–5 cm) remote sensing, we integrate in a novel approach spectral, textural, and gravelometric analyses of a multi-stage alluvial fan at the coast of the Atacama Desert. As long as weathering of fan surface sediments prior to deposition can be largely excluded, the surface parameters investigated serve to relatively date a succession of fan generations. Derived from the differential states of post-depositional alteration, complemented by a morphochronology of the fan system’s evolution based on cosmogenic Beryllium-10 exposure dating, the intensities of responsible weathering processes are discussed. Our results indicate that under coastal hyperaridity, spectral surface signatures are primarily governed by secondary iron oxidation which is closely related to weathering rind formation. Spectral iron oxide ratios continuously increase with age after pre-Holocene fan surface abandonment. Clast breakdown is characterized by a steady decrease of clast coarseness and size variation, both caused by salt weathering. Driven by breakdown as well as lateral remobilization of clasts, nano-scale surface roughness exhibits a non-monotonic relationship with age, whereas the micro-relief experiences continuous smoothing due to denudation. Summarized in a conceptual model, fan surface weathering results over timescales of tens to hundreds of thousands of years in a mature desert pavement. For the hyperarid coast of the Atacama Desert, it can be further deduced that weathering intensity during the Late Quaternary is related to changes in sea surface temperature and sea level driving jointly the oceanic moisture supply. |
Responsible Party
| Creators: | Janek Walk (Author), Melanie Bartz (Author), Georg Stauch (Author), Ariane Binnie (Author), Helmut Brückner (Author), Frank Lehmkuhl (Author) |
| Funding Reference: | Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit |
| Publisher: | CRC1211 Database (CRC1211DB) |
| Publication Year: | 2021 |
Topic
| CRC1211 Topic: | Surface |
| Related Subproject: | C2 |
| Subjects: | Keywords: Geomorphology, Satellite remote sensing, Ground-based remote sensing, Geochronology, Cosmogenic Nuclides, Arid Zone |
| Geogr. Information Topic: | Environment |
File Details
| Filename: | Walk_2021_MGM_Weathering_under_coastal_hyperaridity_16-9_oral.pdf |
| Data Type: | Text - Text |
| Size: | 13 Pages |
| File Size: | 5.1 MB |
| Date: | Created: 05.11.2021 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | According to the CRC1211DB data policy agreement. © Author(s) 2021. |
| Access Limitations: | According to the CRC1211DB data policy agreement. © Author(s) 2021. |
| Licence: | [CRC1211DB] Data policy agreement |
Geographic
Specific Information - Presentation
| Presenter: | Janek Walk |
| Presentation Date: | 7th of November, 2021 |
| Presentation Type: | Talk |
| Event: | Mid-European Geomorphology Meeting (MGM) 2021 |
| Event Type: | Conference |
| Event Location: | München |
| Event Duration: | 6th of November, 2021 - 9th of November, 2021 |
| Event Website: | https://www.ak-geomorphologie.de/tagungen/mgm-2021/ |
Metadata Details
| Metadata Creator: | Janek Walk |
| Metadata Created: | 18.11.2021 |
| Metadata Last Updated: | 18.11.2021 |
| Subproject: | C2 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
Metadata Export
| Metadata Schema: |
Dataset Statistics
| Page Visits: | 24 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
Dataset Activity
Feature
DownloadBy downloading this dataset you accept the license terms of [CRC1211DB] Data policy agreement and CRC1211DB Data Protection Statement
Adequate reference when this dataset will be discussed or used in any publication or presentation is mandatory. In this case please contact the dataset creator.
Adequate reference when this dataset will be discussed or used in any publication or presentation is mandatory. In this case please contact the dataset creator.
