Impact of lake-level changes on the formation of thermogene travertine in continental rifts: Evidence from Lake Bogoria, Kenya Rift Valley

Sedimentology

Volumn 60, Issue 2, 2013, Pages 428-468

  Renaut, Robin W ^a   Owen, R Bernhart ^b   Jones, Brian ^c   Tiercelin, Jean Jacques ^d   Tarits, Corinne ^e   Ego, John K ^f   Konhauser, Kurt O ^c  

^a UNIVERSITY OF SASKATCHEWAN   (Canada)

^b HONG KONG BAPTIST UNIVERSITY   (Hong Kong)

^c UNIVERSITY OF ALBERTA   (Canada)

^d UNIVERSITÉ DE RENNES 1   (France)

^e UNIVERSITÉ DE BRETAGNE OCCIDENTALE   (France)

^f NATIONAL OIL CORPORATION OF KENYA   (Kenya)

Author keywords

Geothermal; Hot spring; Kenya Rift; Saline lake; Travertine

Indexed keywords

CALCITE PRECIPITATION; CARBONATE PRECIPITATION; CONTINENTAL RIFT; CRYSTAL MORPHOLOGIES; DELTA PLAIN; GEOTHERMAL; HYPERSALINE; INTERMEDIATE LEVEL; KENYA RIFT; LAKE LEVELS; LAKE WATERS; LAND SURFACE; LATE PLEISTOCENE; OPTIMAL CONDITIONS; PLUMBING SYSTEMS; SALINE LAKE; TRAVERTINE;

ALKALINITY; CALCITE; CARBON DIOXIDE; CARBONATE MINERALS; GEOLOGIC MODELS; GROUNDWATER; HOT SPRINGS; HYDROSTATIC PRESSURE; LAKES; PHASE TRANSITIONS; SILICA; SILICATES; SODIUM; STRATIGRAPHY;

LIMESTONE;

GEOTHERMAL SYSTEM; LAKE LEVEL; PRECIPITATION (CHEMISTRY); RIFT ZONE; SALINE LAKE; THERMAL SPRING; TRAVERTINE;

EAST AFRICAN RIFT; KENYA; KENYA RIFT; LAKE BOGORIA; RIFT VALLEY;

BOGORIA;

EID: 84873135409     PISSN: 00370746     EISSN: 13653091     Source Type: Journal    
DOI: 10.1111/j.1365-3091.2012.01347.x     Document Type: Article

References (134)

1. Allen, E.T. (1934) Neglected factors in the development of thermal springs. Proc. Natl. Acad. Sci. USA, 20, 345-349.
2. Allen, D.J., Darling, W.G. and Burgess, W.G. (1989) Geothermics and hydrogeology of the southern part of the Kenya Rift Valley with emphasis on the Magadi-Nakuru area. Brit. Geol. Surv. Res. Rep., SD/89/1, 68 pp (and appendices).
3. Alonso-Zarza, A.M. and Wright, V.P. (2010) Palustrine carbonates. In: Carbonates in Continental Settings: Facies, Environments, and Processes (Developments in Sedimentology, v. 61) (Eds A.M. Alonso-Zarza and L.H. Tanner), pp. 103-131. Elsevier, Amsterdam.
4. Ambraseys, N.N. (1991) Earthquake hazard in the Kenya Rift: the Subukia earthquake 1928. Geophys. J. Int., 105, 253-269.
5. Arenas, C. and Pardo, G. (1999) Latest Oligocene-Late Miocene lacustrine systems of the north-central part of the Ebro Basin (Spain): sedimentary facies model and palaeogeographic synthesis. Palaeogeogr. Palaeoclimatol. Palaeoecol., 151, 127-148.
6. Arnórsson, S. (1989) Deposition of calcium carbonate minerals from geothermal waters - theoretical considerations. Geothermics, 18, 33-39.
7. Arp, G., Thiel, V., Reimer, A., Michaelis, W. and Reitner, J. (1999) Biofilm exopolymers control microbialite formation at thermal springs discharging into alkaline Pyramid Lake, Nevada, USA. Sed. Geol., 126, 159-176.
8. Bahati, G., Natukunda, J.F. and Tuhumwire, J. (2010) Geothermal energy in Uganda, country update. Proceedings of the World Geothermal Congress, Bali, Indonesia, 25-29 April 2010, 8 pp.
9. Benson, L.V. (1978) Fluctuation in the level of Lake Lahontan during the last 40, 000years. Quatern. Res., 9, 300-318.
10. Benson, L.V. (1994) Carbonate deposition, Pyramid Lake Subbasin, Nevada, 1. Sequence of formation and elevational distribution of carbonate deposits (Tufas). Palaeogeogr. Palaeoclimatol. Palaeoecol., 109, 55-87.
11. Birney de Wet, C.C. and Hubert, J.F. (1989) The Scots Bay Formation, Nova Scotia, Canada, a Jurassic carbonate lake with silica-rich hydrothermal springs. Sedimentology, 36, 857-873.
12. Bohacs, K.M., Carroll, A.R., Neal, J.E. and Mankiewicz, P.J. (2000) Lake-basin type, source potential, and hydrocarbon character: an integrated sequence-stratigraphic-geochemical framework. In: Lake Basins Through Space and Time (Eds E.H. Gierlowski-Kordesch and K.R. Kelts), AAPG Stud. Geol., 46, 157-168.
13. Bonny, S. and Jones, B. (2003) Relict tufa at Miette Hot Springs, Jasper National Park, Alberta, Canada. Can. J. Earth Sci., 40, 1459-1481.
14. Brock, T.S. (1978) Thermophilic Microorganisms and Life at High Temperatures. Springer, New York, 465 pp.
15. Brogi, A., Capezzuoli, E., Aqué, R., Branca, M. and Voltaggio, M. (2010) Studying travertines for neotectonics investigations: Middle-Late Pleistocene syn-tectonic travertine deposition at Serre di Rapolano (Northern Apennines, Italy). Int. J. Earth Sci., 99, 1383-1398.
16. Bryan, T.S. (2005) Geysers: What They are and How They Work, 2nd edn. Mountain Press, Missoula, 70 pp.
17. Bryan, T.S. (2008) The Geysers of Yellowstone, 4th edn. University Press of Colorado, Boulder, 461 pp.
18. Canet, C., Prol-Ledesma, R.M., Proenza, J.A., Rubio-Ramos, M.A., Forrest, M.J., Torres-Vera, M.A. and Rodríguez-Díaz, A.A. (2005) Mn-Ba-Hg mineralization at shallow submarine hydrothermal vents in Bahía Concepción, Baja California Sur, Mexico. Chem. Geol., 224, 96-112.
19. Capezzuoli, E. and Gandin, A. (2005) Facies distribution and microfacies of thermal-spring travertine from Tuscany. In: Proceedings of the 1st International Symposium on Travertine (Eds M. Özkul, S. Yaǧiz and B. Jones), pp. 43-49. Kozan Ofset Maatbaaci{dotless}li{dotless}k San ve. Tic. Ltd., Şti, Ankara.
20. Casanova, J. (1986) Les Stromatolites Continentaux: Paléoécologie, Paléohydrologie, Paléoclimatologie. Application au Rift Gregory. Thèse Docteur d'Etat-Sciences, Université d'Aix Marseille II, 256 pp.
21. Casanova, J. (1987a) Travertins et stromatolites: Les travertines. In: Le demi-graben de Baringo-Bogoria, Rift Gregory, Kenya: 30, 000 ans d'histoire hydrologique et sédimentaire (Eds J.J. Tiercelin and A. Vincens), Bull. Centres Rech. Explor.-Prod. Elf-Aquitaine, 11, 481-484.
22. Casanova, J. (1987b) Travertins et stromatolites: Chronologie. In: Le demi-graben de Baringo-Bogoria, Rift Gregory, Kenya: 30, 000 ans d'histoire hydrologique et sédimentaire (Eds J.J. Tiercelin and A. Vincens), Bull. Centres Rech. Explor.-Prod. Elf-Aquitaine, 11, 498-499.
23. Casanova, J. (1994) Stromatolites from the East African Rift: a synopsis. In: Phanerozoic Stromatolites, II (Eds J. Bertrand-Safarti and C. Monty), pp. 193-226. Kluwer, Dordrecht.
24. Casanova, J. and Renaut, R.W. (1987) Les stromatolites du milieu hydrothermal. In: Le demi-graben de Baringo-Bogoria, Rift Gregory, Kenya: 30, 000 ans d'histoire hydrologique et sédimentaire (Eds J.J. Tiercelin and A. Vincens), Bull. Centres Rech. Explor.-Prod. Elf-Aquitaine, 11, 484-490.
25. Chafetz, H.S. and Folk, R.L. (1984) Travertines: depositional morphology and the bacterially constructed constituents. J. Sed. Petrol., 54, 289-316.
26. Chafetz, H.S. and Guidry, S.A. (1999) Bacterial shrubs, crystal shrubs, and ray-crystal shrubs: bacterial vs. abiotic precipitation. Sed. Geol., 126, 57-74.
27. Chafetz, H.S. and Guidry, S.A. (2003) Deposition and diagenesis of Mammoth Hot Springs travertine accumulation, Yellowstone National Park, Wyoming, USA. Can. J. Earth Sci., 40, 1515-1529.
28. Chafetz, H.S. and Lawrence, J.R. (1994) Stable isotopic variability within modern travertines. Géog. Phys. Quatern., 48, 257-273.
29. Chernet, T. (2011) Geology and hydrothermal resources in the northern Lake Abaya area (Ethiopia). J. Afr. Earth Sci., 61, 129-141.
30. Cioni, R., Fanelli, G., Guidi, M., Kinyariro, J.K. and Marini, L. (1992) Lake Bogoria hot springs (Kenya): geochemical features and geothermal implications. J. Volcanol. Geotherm. Res., 50, 231-246.
31. Clarke, M.C.G., Woodhall, D.G., Allen, D. and Darling, G. (1990) Geological, Volcanological and Hydrogeological Controls on the Occurrence of Geothermal Activity in the Area Surrounding Lake Naivasha, Kenya. Ministry of Energy, Republic of Kenya, 138 pp.
32. Clément, J.-P., Caroff, M., Hémond, C., Tiercelin, J.-J., Bollinger, C., Guillou, H. and Cotton, J. (2003) Pleistocene magmatism in a lithospheric transition area: petrogenesis of alkaline and peralkaline lavas from the Baringo-Bogoria Basin, central Kenya Rift. Can. J. Earth Sci., 40, 1239-1257.
33. Cohen, A.S., Talbot, M.R., Awramik, S.M., Dettman, D.L. and Abell, P. (1997) Lake level and paleoenvironmental history of Lake Tanganyika, Africa, as inferred from late Holocene and modern stromatolites. Geol. Soc. Am. Bull., 109, 444-460.
34. Coolbaugh, M., Lechler, P., Sladek, C. and Kratt, C. (2009) Carbonate tufa columns as exploration guides for geothermal systems in the Great Basin. Geotherm. Res. Council Trans., 33, 461-466.
35. Craig, H. (1957) Isotopic standards for carbon and oxygen and correction factors from mass spectrometric analysis of carbon dioxide. Geochim. Cosmochim. Acta, 12, 133-149.
36. Crane, K. (1981) Thermal variations in the Gregory Rift of southern Kenya (?). Tectonophysics, 74, 239-262.
37. Curewitz, D. and Karson, J.A. (1997) Structural settings of hydrothermal outflow: fracture permeability maintained by fault propagation and interaction. J. Volcanol. Geoth. Res., 79, 149-168.
38. D'Alessandro, W., Giammanco, S., Bellomo, S. and Parello, F. (2007) Geochemistry and mineralogy of travertine deposits on the SW flank of Mt. Etna (Italy): relationships with past volcanic and degassing activity. J. Volcanol. Geoth. Res., 165, 64-70.
39. Darling, W.G., Griesshaber, E., Andrews, J.N., Armannson, H. and O'Nions, R.K. (1995) The origin of hydrothermal and other gases in the Kenya Rift Valley. Geochim. Cosmochim. Acta, 59, 2501-2512.
40. Darling, W.G., Gizaw, B. and Arusei, M.K. (1996) Lake-groundwater relationships and fluid-rock interaction in the East African Rift Valley: isotopic evidence. J. Afr. Earth Sci., 22, 423-431.
41. Delvaux, D., Kraml, M., Sierralta, M., Wittenberg, A., Mayalla, J.W., Kabaka, K., Chamba, M. and GEOTHERM Working Group (2010) Surface exploration of a viable geothermal resource in Mbeya area, SW Tanzania. Part I: Geology of the Ngozi-Songwe geothermal system. Proceedings of the World Geothermal Congress, Bali, Indonesia, 25-29 April 2010, 7 pp.
42. Dilsiz, C., Marques, J.M. and Carreira, P.M.M. (2004) The impact of hydrological changes on travertine deposits related to thermal springs in the Pamukkale area (SW Turkey). Environ. Geol., 45, 808-817.
43. Dramis, F., Materazzi, M. and Cilla, G. (1999) Influence of climatic changes on freshwater travertine deposition: a new hypothesis. Phys. Chem. Earth (A), 10, 893-897.
44. Dunkley, P.N., Smith, M., Allen, D.J. and Darling, W.G. (1993) The geothermal activity and geology of the northern sector of the Kenya Rift Valley. Brit. Geol. Surv. Res. Rep., SC/93/1, 185.
45. Ekmekci, M., Gunay, G. and Simsek, S. (1995) Morphology of the rimstone pools at Pamukkale, Western Turkey. Cave Karst Sci., 22, 103-106.
46. Eugster, H.P. and Jones, B.F. (1979) Behavior of major solutes during closed-basin brine evolution. Am. J. Sci., 279, 609-631.
47. Fontes, J.-C. and Pouchan, P. (1975) Les cheminées du lac Abhé (TFAI): stations hydroclimatiques de l'Holocène. CR Acad. Sci. Paris, Sér D., 280, 383-386.
48. Ford, T.D. and Pedley, H.M. (1996) A review of tufa and travertine deposits of the world. Earth-Sci. Rev., 41, 117-175.
49. Fouke, B.W. (2011) Hot-spring systems geobiology: abiotic and biotic influences on travertine formation at Mammoth Hot Springs, Yellowstone National Park, USA. Sedimentology, 58, 170-219.
50. Fournier, R.O. (1985) Carbonate transport and deposition in the epithermal environment. In: Geology and Geochemistry of Epithermal Systems (Eds B.R. Berger and P.M. Bethke), Soc. Econ. Geol. Rev. Econ. Geol., 2, 63-72.
51. Galenko, K. and Zhuravlev, V.A. (Eds) (1994) Physics of Dendrites: Computational Experiments. World Scientific Publishing Co., Singapore, 199 pp.
52. Geptner, A., Kristmannsdóttir, H., Kristjansson, J. and Marteinsson, V. (2002) Biogenic saponite from an active submarine hot spring, Iceland. Clay Clay Mineral., 50, 174-185.
53. Gierlowski-Kordesch, E.H. (2010) Lacustrine carbonates. In: Carbonates in Continental Settings: Facies, Environments, and Processes (Developments in Sedimentology, v. 61) (Eds A.M. Alonso-Zarza and L.H. Tanner), pp. 1-101. Elsevier, Amsterdam.
54. Giggenbach, W.F., Sheppard, D.S., Robinson, B.W., Stewart, M.K. and Lyon, G.L. (1994) Geochemical structure and position of the Waiotapu Geothermal Field, New Zealand. Geothermics, 23, 217-262.
55. Glover, R.B. (1972) Chemical Characteristics of Water and Steam Discharges in the Rift Valley of Kenya. Unpublished Report, Geothermal Resources Exploration Project, United Nations-East Africa Power and Lighting, Nairobi, Kenya, 59 pp (and appendices).
56. Grant, W.D. and Tindall, B.J. (1986) The alkaline saline environment. In: Microbes in Extreme Environments (Eds R.A. Herbert and G.A. Codd), pp. 25-54. Academic Press, London.
57. Griffiths, P.S. (1977) Geology of the Lake Hannington-Perkerra River Area, Kenya Rift Valley. PhD thesis, University of London, 187 pp.
58. Grove, A.T., Street, F.A. and Goudie, A.S. (1975) Former lake levels and climatic change in the Rift Valley of southern Ethiopia. Geogr. J., 141, 177-194.
59. Guido, D.M. and Campbell, K.A. (2011) Jurassic hot spring deposits of the Deseado Massif (Patagonia, Argentina): characteristics and controls on regional distribution. J. Volcanol. Geoth. Res., 203, 35-47.
60. Guo, X. and Chafetz, H.S. (2012) Large tufa mounds, Searles Lake, California. Sedimentology. doi: 10.1111/j.1365-3091.2011.01315.x.
61. Guo, L. and Riding, R. (1998) Hot-spring travertine facies and sequences, Late Pleistocene, Rapolano Terme, Italy. Sedimentology, 45, 163-180.
62. Hackman, B.D. (1988) Geology of the Baringo-Laikipia area. Rep. Mines Geol. Dept. Kenya, 104, 79 pp.
63. Harper, D.M., Childress, R.B., Harper, M.M., Boar, R.R., Hickley, P., Mills, S.C., Otieno, N., Drane, T., Vareschi, E., Nasirwa, O., Mwatha, W.E., Darlington, J.P.E.C. and Escuté-Gasulla, X. (2003) Aquatic biodiversity and saline lakes: Lake Bogoria National Reserve, Kenya. Hydrobiologia, 500, 259-276.
64. Hautot, S., Tarits, P., Whaler, K., Le Gall, B., Tiercelin, J.-J. and Le Turdu, C. (2000) Deep structure of the Baringo Rift Basin (central Kenya) from three-dimensional magnetotelluric imaging: implications for rift evolution. J. Geophys. Res., 105, 23493-23518.
65. Hindák, F. (2001) Thermal microorganisms from a hot spring on the coast of Lake Bogoria, Kenya. Nova Hedwigia, Beih., 123, 77-93.
66. Hochstein, M.P. (1999) Geothermal systems along the East-African Rift. Bull. Hydrogéol., 17, 301-310.
67. Hochstein, M.P., Temu, E.P. and Moshy, C.M.A. (2000) Geothermal resources of Tanzania. Proceedings of the World Geothermal Congress, Kyushu-Tohoku, Japan, 28 May-10 June, 2000, 1233-1238.
68. Holzbecher, E. (2005) Groundwater flow pattern in the vicinity of a salt lake. Hydrobiologia, 532, 233-242.
69. Icole, M., Masse, J.-P., Perinet, G. and Taieb, M. (1990) Pleistocene lacustrine stromatolites, composed of calcium carbonate, fluorite, and dolomite, from Lake Natron, Tanzania: depositional and diagenetic processes and their paleoenvironmental significance. Sed. Geol., 69, 139-155.
70. Johansson, J. and Svensson, J. (2002) Land degradation in the semi-arid catchment of Lake Baringo, Kenya. Projketarab. Göteborgs Univ., B3443, 79.
71. Johnson, C.R., Ashley, G.M., De Wet, C.B., Dvoretsky, R., Park, L., Hover, V.C., Owen, R.B. and McBrearty, S. (2009) Tufa as a record of perennial fresh water in a semi-arid rift basin, Kapthurin Formation, Kenya. Sedimentology, 56, 1115-1137.
72. Jones, B.F. and Deocampo, D.M. (2003) Geochemistry of saline lakes. In: Treatise on Geochemistry, Vol. 5 (Ed. J.I. Drever), pp. 393-424. Elsevier, Amsterdam.
73. Jones, B. and Renaut, R.W. (1995) Noncrystallographic calcite dendrites from hot-spring deposits at Lake Bogoria, Kenya. J. Sed. Res., 64, 154-169.
74. Jones, B. and Renaut, R.W. (1998) Origin of platy calcite crystals in hot-spring deposits of the Kenya Rift Valley. J. Sed. Res., 69, 913-926.
75. Jones, B., Renaut, R.W. and Rosen, M.R. (1996) High-temperature (>90°C) calcite precipitation at Waikite Hot Springs, North Island, New Zealand. J. Geol. Soc. London, 153, 481-496.
76. Jones, B., Renaut, R.W. and Rosen, M.R. (2003) Silicified microbes in a geyser mound: the enigma of low-temperature cyanobacteria in a high-temperature setting. Palaios, 18, 87-109.
77. Karingithi, C. and Wambugu, J. (2008) Geochemical survey case study of Arus and Bogoria geothermal prospects. Papers, Short Course III on Exploration for Geothermal Resources, United Nations University Geothermal Training Programme, Lake Bogoria-Lake Naivasha, Kenya, 24 October-17 November, 17 pp.
78. Karingithi, C. and Wambugu, J. (2010) The geochemistry of Arus and Bogoria geothermal prospects. Proceedings of the World Geothermal Congress, Bali, Indonesia, 25-29 April 2010, 6 pp.
79. Kharaka, Y.K., Gunter, W.D., Aggarwal, P.K., Perkins, E.H. and DeBraal, J.D. (1988) SOLMINEQ.88: a computer program for geochemical modeling of water-rock interactions. US. Geol. Surv. Water Resour. Inv. Rep., 88-4227, 420 pp.
80. Krienitz, L., Ballot, A., Kotut, K., Wiegand, C., Pütz, S., Metcalf, J.S., Codd, G.A. and Pflugmacher, S. (2003) Contribution of hot spring cyanobacteria to the mysterious deaths of Lesser Flamingos at Lake Bogoria, Kenya. FEMS Microbiol. Ecol., 43, 141-148.
81. Krienitz, L., Ballot, A., Casper, P., Kotut, K., Wiegand, C. and Pflugmacher, S. (2005) Cyanobacteria in hot springs of East Africa and their potential toxicity. Algol. Stud., 117, 297-306.
82. Kristmannsdóttir, H., Olafsson, M. and Thorhallsson, S. (1989) Magnesium silicate scaling in district heating systems in Iceland. Geothermics, 18, 191-198.
83. Lazareva, E.V., Zhmodik, S.M., Melgunov, M.S., Petrova, I.V. and Bryanskaya, A.V. (2011) Redistribution of radionuclides between a microbial mat and a carbonate body at the Garga hot spring (Baikal Rift Zone). Dokl. Earth Sci., 439, 1131-1137.
84. Le Turdu, C., Tiercelin, J.-J., Richert, J.P., Rolet, J., Xavier, J.-P., Renaut, R.W., Lezzar, K. and Coussement, C. (1999) Influence of preexisting oblique discontinuities on the geometry and evolution of extensional fault patterns: evidence from the Kenya Rift using SPOT imagery. In: Geoscience of Rift Systems - Evolution of East Africa (Ed. C.K. Morley), AAPG Stud. Geol., 44, 173-191.
85. Mahon, W.A.J., McDowell, G.D. and Finlayson, J.B. (1980) Carbon dioxide: its role in geothermal systems. NZ J. Sci., 23, 133-148.
86. Marker, R.E. (1971) Waterfall tufas: a facet of karst geomorphology in South Africa. Z. Geomorphol. Suppl. Bd., 12, 138-152.
87. McCall, G.J.H. (1957) Geology and groundwater conditions in the Nakuru area. Tech. Rep. Minist. Works Kenya (Hydraul. Br.), 3, 35 pp.
88. McCall, G.J.H. (1967) Geology of the Nakuru-Thomson's Falls-Lake Hannington area. Rep. Geol. Surv. Kenya, 78, 122 pp.
89. McCall, J. (2010) Lake Bogoria, Kenya: hot and warm springs, geysers and Holocene stromatolites. Earth-Sci. Rev., 103, 71-79.
90. McLin, K.S., Moore, J.N., Bowman, J.R. and McCullock, J.E. (2012) Mineralogy and fluid inclusion gas chemistry of production well mineral scale deposits at the Dixie Valley geothermal field, USA. Geofluids, 12. doi: 10.1111/j.1468-8123.2012.00363.x.
91. 13C-rich rift lake environment. Chem. Geol., 173, 293-312.
92. Minissale, A., Kerrick, D.M., Magro, G., Murrell, M.T., Paladini, M., Rihs, S., Sturchio, N.C., Tassi, F. and Vaselli, O. (2002) Geochemistry of Quaternary travertines in the region north of Rome (Italy): structural, hydrologic and paleoclimatic implications. Earth Planet. Sci. Lett., 203, 709-728.
93. Mulwa, J., Barongo, P. and Patel, J. (2006) Preliminary magnetotelluric survey results of Arus-Bogoria geothermal prospect, Kenya. IAGA 18th Workshop on Electromagnetic Induction in the Earth, El Vendrell, Spain, 17-23 September 2006, Extended Abstracts, S7-E5, 1-5.
94. Mwawongo, G.M. (2006) Kenya's geothermal prospects outside Olkaria: status of exploration and development. UN University, Geothermal Training Prog., Reykjavík, Rep., 4, 41-50.
95. Naylor, I. (1972) The Geology of the Lake Hannington Geothermal Prospect. Unpublished Report, United Nations Development Programme - East Africa Power and Lighting Co. Ltd., Nairobi, 27 pp.
96. Nelson, S.T., Karlsson, H.R., Paces, J.B., Tingey, D.G., Ward, S. and Peters, M.T. (2001) Paleohydrologic record of spring deposits in and around Pleistocene pluvial Lake Tecopa, southeastern California. Geol. Soc. Am. Bull., 113, 659-670.
97. Nicholson, K. (1993) Geothermal Fluids: Chemistry and Exploration Techniques. Springer, Berlin, 263 pp.
98. Olago, D., Opere, A. and Barongo, J. (2009) Holocene palaeohydrology, groundwater and climate change in the lake basins of the Central Kenya Rift. Hydrol. Sci. J., 54, 765-780.
99. Omenda, P. (2008) Status of geothermal exploration in Kenya and future plans for its development. Papers, Short Course III on Exploration for Geothermal Resources, United Nations University Geothermal Training Programme, Lake Bogoria-Lake Naivasha, Kenya, 24 October-17 November, 13 pp.
100. O'Neil, J.R. (1968) Hydrogen and oxygen isotope fractionation between ice and water. J. Phys. Chem., 72, 3683-3684.
101. O'Neil, J.R. and Clayton, R.N. (1964) Oxygen isotope geothermometry. In: Isotopic and Cosmic Chemistry (Eds H. Craig, S.L. Miller and G.J. Wasserburg), pp. 157-168. North Holland, Amsterdam.
102. Onyando, J.O., Musila, F. and Awer, M. (2005) The use of GIS and remote sensing techniques to analyse water balance of Lake Bogoria under limited data conditions. J. Civ. Eng. Res. Pract., 2, 53-65.
103. Owen, R.A., Owen, R.B., Renaut, R.W., Scott, J.J., Jones, B. and Ashley, G.M. (2008) Mineralogy and origin of rhizoliths on the margins of saline, alkaline Lake Bogoria, Kenya Rift Valley. Sed. Geol., 203, 143-163.
104. Özkul, M., Varol, B. and Alçiçek, M.C. (2002) Depositional environments and petrography of Denizli travertines. Mineral Res. Explor. Bul., 125, 13-29.
105. Pache, M., Reitner, J. and Arp, G. (2001) Geochemical evidence for the formation of a large Miocene "travertine" mound at a sublacustrine spring in a soda lake (Wallerstein Castle Rock, Nördlinger Ries, Germany). Facies, 45, 211-230.
106. Pagé, P. (1987) Les sources hydrothermales: Données isotopiques. In: Le demi-graben de Baringo-Bogoria, Rift Gregory, Kenya: 30, 000 ans d'histoire hydrologique et sédimentaire (Eds J.J. Tiercelin and A. Vincens), Bull. Centres Rech. Explor.-Prod. Elf-Aquitaine, 11, 295-298.
107. Pedley, H.M. and Rogerson, M. (Eds) (2010) Tufas and speleothems: unravelling the microbial and physical controls. Geol. Soc. London Spec. Pub., 336, 362 pp.
108. Pentecost, A. (2005) Travertine. Springer, Berlin, 445 pp.
109. 2 evasion in travertine formation: a quantitative investigation at an important travertine-depositing hot spring, Le Zitelle, Lazio, Italy. J. Geol. Soc. London, 164, 843-853.
110. Petryshyn, V.A. and Corsetti, F.A. (2011) Analysis of growth directions of columnar stromatolites from Walker Lake, western Nevada. Geobiology, 9, 425-438.
111. Pirajno, F. (2009) Hydrothermal Processes and Mineral Systems. Springer, Berlin, 1250 pp.
112. Pisarskii, B.I., Konev, A.A., Levi, K.G. and Delvaux, D. (1998) Carbon dioxide-bearing alkaline hydrotherms and strontium-bearing travertines in the Songwe River valley (Tanzania). Geol. Geofiz., 39, 941-948.
113. Renaut, R.W. (1982) Late Quaternary Geology of the Lake Bogoria Fault-Trough, Kenya Rift Valley. Unpublished PhD thesis, University of London, 498 pp.
114. Renaut, R.W. and Jones, B. (1997) Controls on aragonite and calcite precipitation in hot spring travertines at Chemurkeu, Lake Bogoria, Kenya. Can. J. Earth Sci., 34, 801-818.
115. Renaut, R.W. and Tiercelin, J.-J. (1994) Lake Bogoria, Kenya Rift Valley: a sedimentological overview. In: Sedimentology and Geochemistry of Modern and Ancient Saline Lakes (Eds R.W. Renaut and W.M. Last), SEPM Spec. Publ., 50, 101-123.
116. Renaut, R.W., Jones, B. and Tiercelin, J.-J. (1998) Rapid in situ silicification of microbes at Loburu hot springs, Lake Bogoria, Kenya Rift Valley. Sedimentology, 45, 1083-1103.
117. Renaut, R.W., Owen, R.B. and Ego, J.K. (2008) Recent changes in geyser activity at Loburu, Lake Bogoria, Kenya Rift Valley. GOSA Trans., 10, 4-14.
118. Rihs, S., Condomines, M. and Poidevin, J.-L. (2000) Long-term behaviour of continental hydrothermal systems: U-series study of hydrothermal carbonates from the French Massif Central (Allier Valley). Geochim. Cosmochim. Acta, 64, 3189-3199.
119. Rinehart, J.S. (1980) Geysers and Geothermal Energy. Springer, Berlin, 223 pp.
120. Rosen, M.R., Arehart, G.B. and Lico, M.S. (2004) Exceptionally fast growth rate of <100-yr-old tufa, Big Soda Lake, Nevada: implications for using tufa as a paleoclimate proxy. Geology, 32, 409-412.
121. Savascin, M.Y. and Birsoy, R. (1993) Geochemical setting and hydrochemical evolution of three modern saline lakes in central Anatolia. Bull. Geol. Soc. Gr., 28, 485-497.
122. Simiyu, S.M. (2010) Status of geothermal exploration in Kenya and future plans for its development. Proceedings of the World Geothermal Congress, Bali, Indonesia, 25-29 April 2010, 11 pp.
123. Simmons, S.F. and Christenson, B.W. (1994) Origins of calcite in a boiling geothermal system. Am. J. Sci., 294, 361-400.
124. Solari, M.A., Hervé, F., Le Roux, J.P., Airo, A. and Sial, A.N. (2010) Paleoclimatic significance of lacustrine microbialites: a stable isotope case study of two lakes at Torres del Paine, southern Chile. Palaeogeogr. Palaeoclimatol. Palaeoecol., 297, 70-82.
125. Sorey, M.L., Suemnicht, G.A., Sturchio, N.C. and Nordquist, G.A. (1991) New evidence on the hydrothermal system in Long Valley caldera, California, from wells, fluid sampling, electrical geophysics, and age determinations of hot-spring deposits. J. Volcanol. Geoth. Res., 48, 229-263.
126. Stoffers, P. and Botz, R. (1994) Hydrothermal carbonate formation in Lake Tanganyika, East-Central-Africa. Chem. Geol., 115, 117-122.
127. Sturchio, N.C., Dunkley, P.N. and Smith, M. (1993) Climate-driven variations in geothermal activity in the northern Kenya Rift Valley. Nature, 362, 233-234.
128. Tarits, C., Renaut, R.W., Tiercelin, J.-J., Le Hérissé, A., Cotten, J. and Cabon, J.-Y. (2006) Geochemical evidence of hydrothermal recharge in Lake Baringo, central Kenya Rift Valley. Hydrol. Process., 20, 2027-2055.
129. Tiercelin, J.J. and Vincens, A. (Eds) (1987) Le demi-graben de Baringo-Bogoria, Rift Gregory, Kenya: 30, 000 ans d'histoire hydrologique et sédimentaire. Bull. Centres Rech. Explor.-Prod. Elf-Aquitaine, 11, 249-540.
130. Viles, H.A., Taylor, M.P., Nicoll, K. and Neumann, S. (2007) Facies evidence of hydroclimatic shifts in tufa depositional sequences from the arid Naukluft Mountains, Namibia. Sed. Geol., 195, 39-53.
131. Vincens, A., Casanova, J. and Tiercelin, J.J. (1986) Palaeolimnology of Lake Bogoria (Kenya) during the 4500 BP high lacustrine phase. In: Sedimentation in the African Rifts (Eds L.E. Frostick, R.W. Renaut, I. Reid and J.-J. Tiercelin), Geol. Soc. London Spec. Publ., 25, 323-330.
132. Walsh, J. (1969) Geology of the Eldama Ravine-Kabarnet area. Geol. Surv. Kenya Rep., 83, 48 pp.
133. Young, P.A.V., Maguire, P.K.H., Laffoley, N.d'.A. and Evans, J.R. (1991) Implications of the distribution of seismicity near Lake Bogoria in the Kenya Rift. Geophys. J. Int., 105, 665-674.
134. Zielke, O. and Strecker, M.R. (2009) Recurrence of large earthquakes in magmatic continental rifts: insights from a paleoseismic study along the Laikipia-Marmanet Fault, Subukia Valley, Kenya Rift. Bull. Seismol. Soc. Am., 99, 61-70.