Mineralogy and origin of rhizoliths on the margins of saline, alkaline Lake Bogoria, Kenya Rift Valley

Owen, Richard Alastair; Owen, R. Bernhart; Renaut, Robin W.; Scott, Jennifer J.; Jones, Brian; Ashley, Gail M.

doi:10.1016/j.sedgeo.2007.11.007

Cited by 57 publications

(49 citation statements)

References 53 publications

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“…Renaut et al (2002) described hot-spring travertine containing silicified plant casts near the Lothidok Hills (NW Kenya). The occurrence of silicified plants in spring-fed wetlands has also been reported by R.A. Owen et al (2008) at Lake Bogoria (Kenya) and by Liutkus and Ashley (2003) at Olduvai Gorge (Tanzania). More recently, Ashley et al (2009) have reported on the occurrence of springfed wetlands between about 1.79 and 1.74 Ma at Olduvai.…”

Section: Introductionsupporting

confidence: 54%

“…Owen, unpublished data). Furthermore, R.A. Owen et al (2008) reported that fluorite is common in the Fig. 8.…”

Section: Depositional Modelsmentioning

confidence: 99%

“…7) is based on one presented by R.A. Owen et al (2008) for Holocene sediments on the margins of saline, alkaline Lake Bogoria in the central Kenya Rift, where shallow lake-marginal marsh (Cyperus laevigatus, Sporobolus spicatus) is fed by perennial hot-spring effluent. By analogy, diatoms inhabited relatively cool distal spring sites and areas subject to periodic lake flooding (cf.…”

Section: Depositional Modelsmentioning

confidence: 99%

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Wetland sedimentation and associated diatoms in the Pleistocene Olorgesailie Basin, southern Kenya Rift Valley

Owen

Renaut

Scott

et al. 2009

Sedimentary Geology

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Section: Introductionsupporting

confidence: 54%

“…Owen, unpublished data). Furthermore, R.A. Owen et al (2008) reported that fluorite is common in the Fig. 8.…”

Section: Depositional Modelsmentioning

confidence: 99%

Section: Depositional Modelsmentioning

confidence: 99%

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Wetland sedimentation and associated diatoms in the Pleistocene Olorgesailie Basin, southern Kenya Rift Valley

Owen

Renaut

Scott

et al. 2009

Sedimentary Geology

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“…Hominins were not subject to modern "standards", but at high concentrations physiological problems potentially start to develop. Fluoride, for example, is often high in East African springs, rivers and lakes Owen et al, 2008) and is known to cause biological difficulties. Modern rift lakes are characterized by a variety of fresh to highly saline conditions.…”

Section: Implications For Early Homininsmentioning

confidence: 99%

Diatomaceous sediments and environmental change in the Pleistocene Olorgesailie Formation, southern Kenya Rift Valley

Owen

Potts

Behrensmeyer

et al. 2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…In the Lake Baringo basin, El Niño events appear to result in 5-to 7-year cycles of rainfall variability ) that bring about lake-level fluctuations of 1-3 m (Owen et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Holocene palaeohydrology, groundwater and climate change in the lake basins of the Central Kenya Rift

Olago

Opere

Barongo

2009

Hydrological Sciences Journal

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The Central Kenya Rift contains small soda lakes such as Nakuru, Elmenteita and Bogoria, freshwater Lake Naivasha, and the partly (spatially) freshwater Lake Baringo. The hydrology of this area is controlled mainly by climate, tectonically controlled morphological and volcanic barriers, faults, and local water-table variations. Much of the area relies on groundwater for human and industrial use, though there are widespread quality issues particularly in relation to fluoride. Despite the huge demand for the resource, little is known about the highly complex groundwater systems; lacking monitoring data, an assessment is developed on the basis of regional geological, hydrogeological and hydrochemical analyses. Significant hydrological changes have taken place in the region over the last 10 000 years as a result of global, regional and local changes, but the impacts on groundwater resources are still largely unknown. The IPCC projects a 10-15% increase of rainfall in the area, but it may not necessarily result in a proportional increase in groundwater recharge. High groundwater recharge periods appear to be anchored on a decadal cycle.Key words Holocene; hydrology; groundwater; climate change; Central Kenya Rift; lake basins Paléohydrologie Holocène, eaux souterraines et changement climatique dans les bassins lacustres du Rift du Centre du Kenya Résumé Le Rift du Centre du Kenya contient de petits lacs salés tels que les lacs Nakuru, Elmenteita et Bogoria, le Lac Naivasha d'eau douce, et le Lac Baringo partiellement (spatialement) d'eau douce. L'hydrologie de cette zone est principalement contrôlée par le climat, des barrières volcaniques et morphologiques sous contraintes tectoniques, des failles, et des variations piézométriques locales. La plupart de la région compte sur les eaux souterraines pour satisfaire les besoins domestiques et industriels, bien que les problèmes de qualité soient largement présents en particulier en termes de fluorures. En dépit des besoins immenses vis-à-vis de la ressource, la connaissance des systèmes hydrogéologiques hautement complexes est faible. Manquant de données de suivi, une évaluation est développée sur la base d'analyses régionales géologiques, hydrogéologiques et hydrochimiques. Des changements hydrologiques significatifs ont eu lieu dans la région au cours des 10 000 dernières années suite à des changements globaux, régionaux et locaux, mais les impacts sur les ressources en eaux souterraines sont largement inconnus. Le GIEC prévoit une augmentation de 10-15% de la pluviosité dans la région, mais qui ne résultera pas nécessairement en une augmentation proportionnelle de la recharge de nappe. Des périodes de forte recharge en eaux souterraines apparaissent être inscrites dans un cycle décennal.

show abstract

Mineralogy and origin of rhizoliths on the margins of saline, alkaline Lake Bogoria, Kenya Rift Valley

Cited by 57 publications

References 53 publications

Wetland sedimentation and associated diatoms in the Pleistocene Olorgesailie Basin, southern Kenya Rift Valley

Wetland sedimentation and associated diatoms in the Pleistocene Olorgesailie Basin, southern Kenya Rift Valley

Diatomaceous sediments and environmental change in the Pleistocene Olorgesailie Formation, southern Kenya Rift Valley

Holocene palaeohydrology, groundwater and climate change in the lake basins of the Central Kenya Rift

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