Poster C02 Unraveling the complex evolution of the Messum Fan (Skeleton Coast, Namibia)
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| Title: | Main Title: Poster C02 Unraveling the complex evolution of the Messum Fan (Skeleton Coast, Namibia) |
| Description: | Abstract: The Messum fan stands out among Skeleton Coast alluvial fans due to its complex morphology, reflecting the interplay of climate, tectonics and sea level change. The Messum River catchment extends up to 100 km inland, taking an intermediate position between larger river systems that have incised into the Great Escarpment and smaller systems spatially confined to the (hyper)-arid Skeleton Coast. The catchment area includes geological structures such as Brandberg, Etendeka Mountains, and Messum Crater, which are potential sediment sources for the alluvial fan but may not have contributed equally to its formation. A precipitation gradient within the catchment implies eastward increasing rainfall, including heavy rainfall events. The fan surface lies within the coastal fog's altitudinal range, potentially contributing to post-aggregational alterations. The chronology of alluvial deposition in the vicinity of the Messum has been assessed in previous studies, focusing on the nearby Koigab and Horingbaai fan. The Horingbaai fan, located 10 km south of the Messum fan, experienced its main episode of fan progradation between 2.7 Ma and 2.2 Ma. This period correlates with offshore pollen records indicating a shift towards general aridification starting at 2.2 Ma. At the Messum fan, several marine terraces at approximately 28 m, 15 m, and 5 m on the fan surface have been assumed to correlate with Plio-Pleistocene highstands observed at the Horingbaai fan. During field campaigns in 2022 and 2023, we sampled different surface levels for in situ 10Be surface exposure dating to elucidate the formation of the Messum fan, including post-aggradational incision of the Messum River. To contextualize the age information from the each of the sampled sites, we conducted detailed mapping, and geomorphometric analysis based on high-resolution multispectral imagery from WorldView-2/3, along with a high-resolution digital elevation model derived from stereo imagery calculations. Preliminary 10Be exposure ages from the oldest fan surface sampled near the apex (Q1) indicate a Middle Pleistocene formation age (700-800 ka). This surface extends up to 25 m above the river channel, and appears to be widely distributed across the fan. Samples taken from a lower fluvial terrace situated 12 m below Q1, are of slightly younger age (660 – 760 ka), reflecting an incision phase after which the main channel underwent only limited lateral shifting in the upper parts of the fan. Our results provide new perspectives on the genesis of the Messum fan and extend the findings of the age concepts of the common marine terrace stratigraphy. |
Responsible Party
| Creators: | Julian Krieger (Author), Joel Mohren (Author), Frank Lehmkuhl (Author), Janek Walk (Author), Dominik Brill (Author), Anna Nguno (Author) |
| Publisher: | CRC1211 Database (CRC1211DB) |
| Publication Year: | 2025 |
Topic
| CRC1211 Topic: | Dating |
| Related Subproject: | C2 |
| Subjects: | Keywords: Geomorphology, Cosmogenic Radionuclides, Quaternary Geology, Arid Zone, Remote Sensing, GIS |
| Geogr. Information Topic: | Environment |
File Details
| Filename: | Poster_C02_Unraveling_the_complex_evolution_of_the_Messum_Fan_Skeleton_Coast_Namibia.pdf |
| Data Type: | Other - Poster |
| Size: | 8 Megabytes |
| File Size: | 7.9 MB |
| Date: | Available: 08.05.2025 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | In Process |
Constraints
| Download Permission: | Only Project Members (Download Embargo will be lifted after project end) |
| General Access and Use Conditions: | According to the CRC1211DB data policy agreement. |
| Access Limitations: | According to the CRC1211DB data policy agreement. |
| Licence: | [CRC1211DB] Data policy agreement |
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Specific Information - Presentation
| Presenter: | Julian Krieger |
| Presentation Date: | 9th of October, 2024 |
| Presentation Type: | Poster |
| Event: | DGGM 2024 |
| Event Type: | Conference |
| Event Location: | Leipzig |
| Event Duration: | 9th of October, 2024 - 12th of October, 2024 |
| Event Website: | https://www.physes.uni-leipzig.de/institut-fuer-geographie/dggm-2024 |
Metadata Details
| Metadata Creator: | Julian Krieger |
| Metadata Created: | 08.05.2025 |
| Metadata Last Updated: | 08.05.2025 |
| Subproject: | C2 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 28 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 2 |
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