| Records |
| Author |
Brook, G.A.; Railsback, L.B.; Marais, E. |
Title  |
Reassessment of carbonate ages by dating both carbonate and organic material from an Etosha Pan (Namibia) stromatolite: Evidence of humid phases during the last 20ka |
Type |
Journal Article |
| Year |
2011 |
Publication |
Quaternary International |
Abbreviated Journal |
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| Volume |
229 |
Issue |
1 |
Pages |
24-37 |
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| Abstract |
Previous research on lacustrine stromatolites from Etosha Pan in Namibia obtained ages on carbonate close to or beyond the limits of radiocarbon dating. These ages suggested that the basin was likely not subject to extensive flooding during the last ca. 40ka. This study shows that AMS radiocarbon ages for the carbonate of a stromatolite from Poacher’s Point are 15–21ka older than ages for organic material in the stromatolite structure. Calibrated ages range from 30 to 40ka for carbonate and 3–19ka for the organic residue. The new ages, together with petrographic and isotopic data for the stromatolite, have provided important new information on past flooding of Etosha Pan including evidence of prolonged lacustrine conditions during the Holocene Climatic Optimum. |
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1040-6182 |
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THL @ christoph.kuells @ brook_reassessment_2011 |
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110 |
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| Author |
Stone, A. |
| Title |
Recharge investigations above the Stampriet Aquifer in semi-arid Namibia using geochemical methods and environmental tracers; sand, salt and water |
Type |
Journal Article |
| Year |
2012 |
Publication |
Quaternary International |
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| Volume |
279-280 |
Issue |
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Pages |
470-471 |
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1040-6182 |
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THL @ christoph.kuells @ stone_recharge_2012 |
Serial |
108 |
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Wang, W.; Liang, X.; Niu, Q.; Wang, Q.; Zhuo, J.; Su, X.; Zhou, G.; Zhao, L.; Yuan, W.; Chang, J.; Zheng, Y.; Pan, J.; Wang, Z.; Ji, Z. |
| Title |
Reformability evaluation of blasting-enhanced permeability in in situ leaching mining of low-permeability sandstone-type uranium deposits |
Type |
Journal Article |
| Year |
2023 |
Publication |
Nuclear Engineering and Technology |
Abbreviated Journal |
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| Volume |
55 |
Issue |
8 |
Pages |
2773-2784 |
| Keywords |
Analytic hierarchy process-entropy method, Fuzzy mathematics method, Mechanical property, Mineral composition, Pore structure, Split Hopkinson pressure bar |
| Abstract |
It is essential to evaluate the blasting-enhanced permeability (BEP) feasibility of a low-permeability sandstone-type uranium deposit. In this work, the mineral composition, reservoir physical properties and rock mechanical properties of samples from sandstone-type uranium deposits were first measured. Then, the reformability evaluation method was established by the analytic hierarchy process-entropy weight method (AHP-EWM) and the fuzzy mathematics method. Finally, evaluation results were verified by the split Hopkinson Pressure Bar (SHPB) experiment and permeability test. Results show that medium sandstone, argillaceous sandstone and siltstone exhibit excellent reformability, followed by coarse sandstone and fine sandstone, while the reformability of sandy mudstone is poor and is not able to accept BEP reservoir stimulation. The permeability improvement and the distribution of damage fractures before and after the SHPB experiment confirm the correctness of evaluation results. This research provides a reformability evaluation method for the BEP of the low-permeability sandstone-type uranium deposit, which contributes to the selection of the appropriate regional and stratigraphic horizon of the BEP and the enhanced ISL of the low-permeability sandstone-type uranium deposit. |
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1738-5733 |
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THL @ christoph.kuells @ wang_reformability_2023 |
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194 |
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| Author |
Külls, C. |
| Title |
Rekonstruktion hydrologischer Extreme in der Namibwüste |
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Journal Article |
| Year |
2011 |
Publication |
Berichte der naturforschenden Gesellschaft zu Freiburg im Breisgau |
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101 |
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69-81 |
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THL @ christoph.kuells @ |
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71 |
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| Author |
Davila, P.; Külls, C. |
| Title |
Reliability of current CFC data for age dating of water |
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Conference Article |
| Year |
2010 |
Publication |
EGU Geophysical Abstracts |
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536 |
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THL @ christoph.kuells @ Davila2010reliability |
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49 |
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