Late Neogene terrestrial climate reconstruction of the central Namib Desert derived by the combination of U–Pb silcrete and terrestrial cosmogenic nuclide exposure dating
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| Title: | Main Title: Late Neogene terrestrial climate reconstruction of the central Namib Desert derived by the combination of U–Pb silcrete and terrestrial cosmogenic nuclide exposure dating |
| Description: | Abstract: The chronology of the Cenozoic “Namib Group” of the Namib Desert is rather poorly understood and lacks direct radiometric dating. Thus, the paleoclimate and landscape evolution of the central Namib Desert remains imprecise, complicating the detailed search for global and/or local forcing factors for the aridification of the Namib. The widespread occurrence of calcretes and silcretes in the Namib Desert allows us to apply the novel application of the U–Pb laser ablation dating technique on silcretes and calcretes to date important phases of landscape stability and to retrieve critical paleoclimatic and environmental information on desertification and its paleoclimatic variability. Microscale silcrete formation (maximum of 8 mm) due to pressure solution by expanding calcrete cementation provides the opportunity to date multiple phases (multiple generations of silcrete as growing layers or shells) of silcrete formation. Groundwater silcrete and calcrete formation occurred at our study site during the Pliocene, a period of relatively stable climate and landscape conditions under semi-arid to arid conditions. Terrestrial cosmogenic nuclide (TCN) exposure ages from flat canyon rim surfaces indicate the cessation of groundwater calcrete formation due to incision during the Late Pliocene–Early Pleistocene and mark a large-scale landscape rejuvenation due to climate shifts towards more arid conditions in the Pleistocene, which can be connected to global climate patterns. This study demonstrates the feasibility of applying U–Pb laser ablation to groundwater silcrete and calcretes, discusses several important issues associated with this technique, and opens up the possibility of dating numerous sedimentary sequences containing silcretes and calcretes in arid environments. In particular, the use of silcretes (as described above) reduces potential effects of detrital components and bulk signal measurements by using massive calcretes. Our study redefines and improves the generally accepted Late Cenozoic chronostratigraphy of the Namib Desert (Miller, 2008). |
| Identifier: | https://doi.org/10.5194/gchron-5-433-2023 (DOI) |
| Related Resource: | Is Metadata For Data Paper https://doi.org/10.5194/gchron-5-433-2023 (DOI) |
| Citation Advice: | Ritter, B., Albert, R., Rakipov, A., Van der Wateren, F. M., Dunai, T. J., and Gerdes, A.: Late Neogene terrestrial climate reconstruction of the central Namib Desert derived by the combination of U–Pb silcrete and terrestrial cosmogenic nuclide exposure dating, Geochronology, 5, 433–450, https://doi.org/10.5194/gchron-5-433-2023, 2023. |
Responsible Party
| Creators: | Benedikt Ritter (Author), Richard Albert (Author), Aleksander Rapikov (Author), Frederik M. Van Der Wateren (Author), Tibor Dunai (Author), Axel Gerdes (Author) |
| Publisher: | https://www.geochronology.net/ |
| Publication Year: | 2024 |
Topic
| CRC1211 Topic: | Dating |
| Related Subprojects: | D2, D1 |
| Subjects: | Keywords: Dating , Cosmogenic Nuclides, Radiogenic Isotope Geochemistry, Geochronology |
File Details
| Filename: | Ritter_et_al_2023-Namibia_Silcretes.pdf |
| Data Type: | Data Paper - Research paper |
| File Size: | 7.6 MB |
| Dates: | Accepted: 09.10.2023 Submitted: 27.06.2023 Available: 01.12.2023 |
| Mime Type: | application/pdf |
| Data Format: | PDF (1.5) |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Free |
| General Access and Use Conditions: | According to the CRC1211DB data policy agreement. |
| Access Limitations: | According to the CRC1211DB data policy agreement. |
| Licence: | [Creative Commons] Attribution 4.0 International (CC BY 4.0) |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Geochronology |
| Volume: | 5 |
| Number of Pages: | 18 (433 - 450) |
Metadata Details
| Metadata Creator: | Richard Albert |
| Metadata Created: | 01.02.2024 |
| Metadata Last Updated: | 02.02.2024 |
| Subproject: | D2 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 79 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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