| Records |
| Author |
Hamutoko, J.; Mapani, B.; Ellmies, R.; Bittner, A.; Külls, C. |
| Title |
A fingerprinting method for the identification of uranium sources in alluvial aquifers: An example from the Khan and Swakop Rivers, Namibia |
Type |
Journal Article |
| Year |
2014 |
Publication |
Physics and Chemistry of the Earth, Parts A/B/C |
Abbreviated Journal |
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| Volume |
72 |
Issue |
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Pages |
34-42 |
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Pergamon |
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no |
| Call Number |
THL @ christoph.kuells @ Hamutoko2014fingerprinting |
Serial |
19 |
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| Author |
Müller, M.; Alaoui, A.; Külls, C.; Leistert, H.; Meusburger, K.; Stumpp, C.; Weiler, M.; Alewell, C. |
| Title |
Tracking water pathways in steep hillslopes by δ18O depth profiles of soil water |
Type |
Journal Article |
| Year |
2014 |
Publication |
Journal of hydrology |
Abbreviated Journal |
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| Volume |
519 |
Issue |
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Pages |
340-352 |
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Elsevier |
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no |
| Call Number |
THL @ christoph.kuells @ Mueller2014tracking |
Serial |
20 |
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| Author |
Gaj, M.; Beyer, M.; Hamutoko, J.; Uugulu, S.; Wanke, H.; Koeniger, P.; Külls, C.; Lohe, C.; Himmelsbach, T. |
| Title |
How do soil types affect stable isotope ratios of 2H and 18O under evaporation: A Fingerprint of the Niipele subbasin of the Cuvelai-Etosha basin, Namibia |
Type |
Conference Article |
| Year |
2014 |
Publication |
EGU Geophysical Abstracts |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
5890 |
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THL @ christoph.kuells @ Gaj2014soil |
Serial |
44 |
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| Author |
Joseph, J.; Külls, C. |
| Title |
Calibration of 13C and 18O measurements in CO2 using Off-axis Integrated Cavity Output Spectrometer (ICOS) |
Type |
Conference Article |
| Year |
2014 |
Publication |
EGU Geophysical Abstracts |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
659 |
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THL @ christoph.kuells @ Joseph2014calibration |
Serial |
45 |
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| Author |
Külls, C.; Nunes, A.; Köbel-Batista, M.; Branquinho, C.; Bianconi, N.; Costantini, E. |
| Title |
Integrated use of soil physical and water isotope methods for ecohydrological characterization of desertified areas |
Type |
Conference Article |
| Year |
2014 |
Publication |
EGU Geophysical Abstracts |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
15430 |
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no |
| Call Number |
THL @ christoph.kuells @ Kuells2014integrated |
Serial |
46 |
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| Author |
Külls, C. |
| Title |
Ecohydrological principles in economic models of water resources in drylands and desert restoration |
Type |
Miscellaneous |
| Year |
2014 |
Publication |
UNCCD, 2nd Scient. Conf. |
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THL @ christoph.kuells @ Kuells2014ecohydrological |
Serial |
68 |
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| Author |
Ingham, E.S.; Cook, N.J.; Cliff, J.; Ciobanu, C.L.; Huddleston, A. |
| Title |
A combined chemical, isotopic and microstructural study of pyrite from roll-front uranium deposits, Lake Eyre Basin, South Australia |
Type |
Journal Article |
| Year |
2014 |
Publication |
Geochimica et Cosmochimica Acta |
Abbreviated Journal |
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| Volume |
125 |
Issue |
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Pages |
440-465 |
| Keywords |
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| Abstract |
The common sulfide mineral pyrite is abundant throughout sedimentary uranium systems at Pepegoona, Pepegoona West and Pannikan, Lake Eyre Basin, South Australia. Combined chemical, isotopic and microstructural analysis of pyrite indicates variation in fluid composition, sulfur source and precipitation conditions during a protracted mineralization event. The results show the significant role played by pyrite as a metal scavenger and monitor of fluid changes in low-temperature hydrothermal systems. In-situ micrometer-scale sulfur isotope analyses of pyrite demonstrated broad-scale isotopic heterogeneity (δ34S=−43.9 to +32.4‰VCDT), indicative of complex, multi-faceted pyrite evolution, and sulfur derived from more than a single source. Preserved textures support this assertion and indicate a genetic model involving more than one phase of pyrite formation. Authigenic pyrite underwent prolonged evolution and recrystallization, evidenced by a genetic relationship between archetypal framboidal aggregates and pyrite euhedra. Secondary hydrothermal pyrite commonly displays hyper-enrichment of several trace elements (Mn, Co, Ni, As, Se, Mo, Sb, W and Tl) in ore-bearing horizons. Hydrothermal fluids of magmatic and meteoric origins supplied metals to the system but the geochemical signature of pyrite suggests a dominantly granitic source and also the influence of mafic rock types. Irregular variation in δ34S, coupled with oscillatory trace element zonation in secondary pyrite, is interpreted in terms of continuous variations in fluid composition and cycles of diagenetic recrystallization. A late-stage oxidizing fluid may have mobilized selenium from pre-existing pyrite. Subsequent restoration of reduced conditions within the aquifer caused ongoing pyrite re-crystallization and precipitation of selenium as native selenium. These results provide the first qualitative constraints on the formation mechanisms of the uranium deposits at Beverley North. Insights into depositional conditions and sources of both sulfide and uranium mineralization and an improved understanding of pyrite geochemistry can also underpin an effective vector for uranium exploration at Beverley North and other sedimentary systems of the Lake Eyre Basin, as well as in comparable geological environments elsewhere. |
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0016-7037 |
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no |
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THL @ christoph.kuells @ ingham_combined_2014 |
Serial |
188 |
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| Author |
Stone, A.E.C.; Edmunds, W.M. |
| Title |
Naturally-high nitrate in unsaturated zone sand dunes above the Stampriet Basin, Namibia |
Type |
Journal Article |
| Year |
2014 |
Publication |
Journal of Arid Environments |
Abbreviated Journal |
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| Volume |
105 |
Issue |
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Pages |
41-51 |
| Keywords |
Kalahari, Namibia, Nitrate in the unsaturated zone, Stampriet Basin, Transboundary basin, Unsaturated zone recharge |
| Abstract |
Elevated groundwater nitrate levels are common in drylands, often in excess of WHO guidelines, with concern for human and animal health. In light of recent attempts to identify nitrate sources in the Kalahari this paper presents the first unsaturated zone (USZ) nitrate profiles and recharge rate estimates for the important transboundary Stampriet Basin, alongside the first rainfall chemistry records. Elevated subsurface nitrate reaches 100–250 and 250–525 mg/L NO3–N, with NO3–N/Cl of 4–12, indicating input above evapotranspiration. Chloride mass balance recharge rates range from 4 to 27 mm/y, indicating a vertical movement of these nitrate pulses toward the water table over multi-decadal timescales. These profiles are sampled from dune crests, away from high concentrations of animals and without termite mounds. Given low-density animal grazing is unlikely to contribute consistent spot-scale nitrate over decades, these profiles give an initial estimate of naturally-produced concentrations. This insight is important for the management of the Stampriet Basin and wider Kalahari groundwater. This study expands our knowledge about elevated nitrate in dryland USZs, demonstrating that it can occur as pulses, probably in response to transient vegetation cover and that it is not limited to long-residence time USZs with very limited downward moisture flux (recharge). |
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0140-1963 |
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no |
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THL @ christoph.kuells @ stone_naturally-high_2014 |
Serial |
91 |
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| Author |
Stone, A.E.C.; Edmunds, W.M. |
| Title |
Naturally-high nitrate in unsaturated zone sand dunes above the Stampriet Basin, Namibia |
Type |
Journal Article |
| Year |
2014 |
Publication |
Journal of Arid Environments |
Abbreviated Journal |
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| Volume |
105 |
Issue |
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Pages |
41-51 |
| Keywords |
Kalahari, Namibia, Nitrate in the unsaturated zone, Stampriet Basin, Transboundary basin, Unsaturated zone recharge |
| Abstract |
Elevated groundwater nitrate levels are common in drylands, often in excess of WHO guidelines, with concern for human and animal health. In light of recent attempts to identify nitrate sources in the Kalahari this paper presents the first unsaturated zone (USZ) nitrate profiles and recharge rate estimates for the important transboundary Stampriet Basin, alongside the first rainfall chemistry records. Elevated subsurface nitrate reaches 100–250 and 250–525 mg/L NO3–N, with NO3–N/Cl of 4–12, indicating input above evapotranspiration. Chloride mass balance recharge rates range from 4 to 27 mm/y, indicating a vertical movement of these nitrate pulses toward the water table over multi-decadal timescales. These profiles are sampled from dune crests, away from high concentrations of animals and without termite mounds. Given low-density animal grazing is unlikely to contribute consistent spot-scale nitrate over decades, these profiles give an initial estimate of naturally-produced concentrations. This insight is important for the management of the Stampriet Basin and wider Kalahari groundwater. This study expands our knowledge about elevated nitrate in dryland USZs, demonstrating that it can occur as pulses, probably in response to transient vegetation cover and that it is not limited to long-residence time USZs with very limited downward moisture flux (recharge). |
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0140-1963 |
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no |
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THL @ christoph.kuells @ Stone201441 |
Serial |
218 |
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| Author |
Shams, A. |
| Title |
A rediscovered-new ‘Qanat’ system in the High Mountains of Sinai Peninsula, with Levantine reflections |
Type |
Journal Article |
| Year |
2014 |
Publication |
Journal of Arid Environments |
Abbreviated Journal |
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| Volume |
110 |
Issue |
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Pages |
69-74 |
| Keywords |
Foggara, Irrigation, Levant, Qanat, Sinai Peninsula |
| Abstract |
Since the Achaemenid Empire in 532–332 BCE, the ‘Qanat’ became the central irrigation system in the arid and semi-arid lands. Several terms are used for ‘Qanat’ in different regions, including the Karez, Qanat, Falaj type Daudi, Qanat Romani, Fuqara (Foggara), or Khettara as known in Central Asia, Persia, Southeast Arabia, Levant, North Africa, or Morocco respectively. Typically, the ground, spring or surface water (i.e. seasonal floods or river-fed) sources feed similar irrigation system. Based on thirteen years of extensive survey and analysis work (i.e. Sinai Peninsula Research 2000–2013 CE), this paper presents a rediscovered-new Qanat system in the High Mountains of Sinai Peninsula (i.e. UNESCO World Heritage Site ‘WHS’ no. 954) under chronological open question with Levantine reflections. In 1970s CE, the present Sinaitic site of Farsh Abu A’lwan or the anciently known Farsh Shamma’a was archaeologically surveyed without a direct reference to the Qanat system in-situ. Scientifically, it is an argumentative and unique Qanat system in terms of chronology, location (region), site (local-setting), water source, size and household utility. It is the only discovered ‘Qanat’ across the Sinai, connecting the Near East and North Africa. |
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0140-1963 |
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no |
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THL @ christoph.kuells @ Shams201469 |
Serial |
248 |
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