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V. Hover, G. Ashley (2003)
Geochemical Signatures of Paleodepositional and Diagenetic Environments: A STEM/AEM Study of Authigenic Clay Minerals from an Arid Rift Basin, Olduvai Gorge, TanzaniaClays and Clay Minerals, 51
D. Deocampo, Javier Cuadros, T. Wing-dudek, J. Olives, M. Amouric (2009)
Saline lake diagenesis as revealed by coupled mineralogy and geochemistry of multiple ultrafine clay phases: Pliocene Olduvai Gorge, TanzaniaAmerican Journal of Science, 309
D. Deocampo (2005)
Evaporative evolution of surface waters and the role of aqueous CO2 in magnesium silicate precipitation: Lake Eyasi and Ngorongoro Crater, northern TanzaniaSouth African Journal of Geology, 108
H. Muraishi (1995)
Experimental Study of Amorphous Silica Crystallization in Na2CO3–NaHCO3 Solutions as a Source of Chert Formation in Lake MagadiBulletin of the Chemical Society of Japan, 68
D. Verschuren (1999)
Influence of depth and mixing regime on sedimentation in a small, fluctuating tropical soda lakeLimnology and Oceanography, 44
I. Gunnarsson, S. Arnórsson (2000)
Amorphous silica solubility and the thermodynamic properties of H4SiO°4 in the range of 0° to 350°C at PsatGeochimica et Cosmochimica Acta, 64
P. Kilham (1982)
The Effect of Hippopotamuses on Potassium and Phosphate Ion Concentrations in an African LakeAmerican Midland Naturalist, 108
G. Kling (1988)
Comparative transparency, depth of mixing, and stability of stratification in lakes of Cameroon, West Africa1Limnology and Oceanography, 33
H. Eugster (1969)
Inorganic bedded cherts from the Magadi area, KenyaContributions to Mineralogy and Petrology, 22
Blair Jones, H. Eugster, S. Rettig (1977)
Hydrochemistry of the Lake Magadi basin, KenyaGeochimica et Cosmochimica Acta, 41
D. Deocampo (2004)
Hydrogeochemistry in the Ngorongoro Crater, Tanzania, and implications for land use in a World Heritage SiteApplied Geochemistry, 19
JM Melack (1978)
Morphometric, physical and chemical features of the volcanic crater lakes of western UgandaArch Hydrobiol, 84
H. Eugster (1967)
Hydrous Sodium Silicates from Lake Magadi, Kenya: Precursors of Bedded ChertScience, 157
H. Eugster, B. Jones (1968)
Gels Composed of Sodium-Aluminium Silicate, Lake Magadi, KenyaScience, 161
M. Mann (2002)
Little Ice Age
R. Renaut, J. Tiercelin (1994)
Lake Bogoria, Kenya Rift Valley — A Sedimentological Overview
J. Russell, T. Johnson (2005)
A high-resolution geochemical record from Lake Edward, Uganda Congo and the timing and causes of tropical African drought during the late HoloceneQuaternary Science Reviews, 24
Tine Lærdal, M. Talbot (2002)
Basin neotectonics of Lakes Edward and George, East African RiftPalaeogeography, Palaeoclimatology, Palaeoecology, 187
F. Risacher, A. Clément (2001)
A computer program for the simulation of evaporation of natural waters to high concentrationComputers & Geosciences, 27
B. Jones, S. Rettig, H. Eugster (1967)
Silica in Alkaline BrinesScience, 158
S. Macintyre, J. Melack (1982)
Meromixis in an equatorial African soda lake1Limnology and Oceanography, 27
D. Deocampo (2004)
Authigenic clays in East Africa: Regional trends and paleolimnology at the Plio–Pleistocene boundary, Olduvai Gorge, TanzaniaJournal of Paleolimnology, 31
B. Jones, D. Deocampo (2003)
Geochemistry of saline lakesTreatise on Geochemistry, 5
R. Hay, T. Kyser (2001)
Chemical sedimentology and paleoenvironmental history of Lake Olduvai, a Pliocene lake in northern TanzaniaGeological Society of America Bulletin, 113
R. Hay (1968)
Chert and its sodium-silicate precursors in sodium-carbonate lakes of East AfricaContributions to Mineralogy and Petrology, 17
J. Russell, T. Johnson (2006)
The Water Balance and Stable Isotope Hydrology of Lake Edward, Uganda-Congo, 32
A. Arad, W. Morton (1969)
Mineral springs and saline lakes of the Western Rift Valley, UgandaGeochimica et Cosmochimica Acta, 33
R. Hecky, P. Kilham (1973)
DIATOMS IN ALKALINE, SALINE LAKES: ECOLOGY AND GEOCHEMICAL IMPLICATIONS1Limnology and Oceanography, 18
RL Hay, TK Kyser (2001)
Chemical sedimentology and paleoenvironmental history of Lake Olduvai, a Pliocene lake in northern TanzaniaGSA Bull, 113
J. Russell, D. Verschuren, H. Eggermont (2007)
Spatial complexity of ‘Little Ice Age’ climate in East Africa: sedimentary records from two crater lake basins in western UgandaThe Holocene, 17
H. Eugster, B. Jones (1979)
Behavior of major solutes during closed-basin brine evolutionAmerican Journal of Science, 279
RW Renaut, JJ Tiercelin (1994)
Sedimentology and geochemistry of modern and ancient saline lakes, vol 50
Lake Kitagata, Uganda, is a hypersaline crater lake with Na–SO4–Cl–HCO3–CO3 chemistry, high pH and relatively small amounts of SiO2. EQL/EVP, a brine evaporation equilibrium model (Risacher and Clement 2001), was used to model the major ion chemistry of the evolving brine and the order and masses of chemically precipitated sediments. Chemical sediments in a 1.6-m-long sediment core from Lake Kitagata occur as primary chemical mud (calcite, magadiite [NaSi7O13(OH)3·3H2O], burkeite [Na6(CO3)(SO4)2]) and as diagenetic intrasediment growths (mirabilite (Na2SO4·10H2O)). Predicted mineral assemblages formed by evaporative concentration were compared with those observed in salt crusts along the shoreline and in the core from the lake center. Most simulations match closely with observed natural assemblages. The dominant inflow water, groundwater, plays a significant role in driving the chemical evolution of Lake Kitagata water and mineral precipitation sequences. Simulated evaporation of Lake Kitagata waters cannot, however, explain the large masses of magadiite found in cores and the formation of burkeite earlier in the evaporation sequence than predicted. The masses and timing of formation of magadiite and burkeite may be explained by past groundwater inflow with higher alkalinity and SiO2 concentrations than exist today.
Aquatic Geochemistry – Springer Journals
Published: Aug 22, 2010
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