Weathering geochemistry and Sr-Nd fingerprints of equatorial upper Nile and Congo muds

Geochemistry, Geophysics, Geosystems

Volumn 14, Issue 2, 2013, Pages 292-316

  Garzanti, Eduardo ^a   Padoan, Marta ^a   Setti, Massimo ^b   Najman, Yani ^c   Peruta, Luigi ^a   Villa, Igor M ^a,d  

^a UNIVERSITY OF MILANO BICOCCA   (Italy)

^b UNIVERSITY OF PAVIA   (Italy)

^c LANCASTER UNIVERSITY   (United Kingdom)

^d UNIVERSITY OF BERN   (Switzerland)

Author keywords

chemical weathering indices; clay minerals; East African Rift; Kagera catchment; model mantle derivation ages; recycling

Indexed keywords

CATCHMENTS; CLAY MINERALS; GEOCHEMISTRY; GEOLOGIC MODELS; LITHOLOGY; RECYCLING; SEDIMENTOLOGY; SEDIMENTS;

CENTRAL AFRICA; CHEMICAL WEATHERING; EAST AFRICAN RIFT; EQUATORIAL AFRICA; HYDRAULIC SORTING; SEDIMENT COMPOSITION; SEDIMENT GENERATIONS; WEATHERING INDICES;

WEATHERING;

BASALT; CATCHMENT; CHEMICAL WEATHERING; DATABASE; GNEISS; GRAIN SIZE; GRANITE; LITHOLOGY; MINERALOGY; NEODYMIUM; QUANTITATIVE ANALYSIS; SANDSTONE; SEDIMENT CHEMISTRY; SEDIMENTATION; STRONTIUM;

EAST AFRICAN RIFT; SUDAN; TANZANIA;

EID: 84876702321     PISSN: None     EISSN: 15252027     Source Type: Journal    
DOI: 10.1002/ggge.20060     Document Type: Article

References (112)

1. Abdelsalam, G. M., J. P. Liégeois, and, R. J. Stern, (2002), The Saharan Metacraton. J. African Earth Sci., 34, 119-136. (Pubitemid 35016031)
2. Allègre, C. J., B. Dupré, P. Négrel, and, J. Gaillardet, (1996), Sr-Nd-Pb isotope systematics in Amazon and Congo River systems: Constraints about erosion processes. Chem. Geol., 131, 93-112.
3. Andò, S., E. Garzanti, M. Padoan, and, M. Limonta, (2012), Corrosion of heavy minerals during weathering and diagenesis: A catalog for optical analysis. Sedim. Geol., 280, 165-178.
4. Appel, P., V. Schenk, and, A. Schumann, (2005), P-T path and metamorphic ages of pelitic schists at Murchison Falls, NW Uganda: Evidence for a Pan-African tectonometamorphic event in the Congo Craton. Eur. J. Miner., 17, 655-664. (Pubitemid 41520381)
5. Baudet, D., M. Hanon, E. Lemonne, and, K. Theunissen, (1988), Lithostratigraphie du domaine sédimentaire de la chaine Kibarienne au Rwanda. Ann. Soc. Géol. Belgique, 112, 225-246.
6. Bell, K., and, J. L. Powell, (1969), Strontium isotopic studies of alkalic rocks: The potassium rich lavas of the Birunga and Toro-Ankole Regions, East and Central Equatorial Africa. J. Petrol., 10, 536-572.
7. Biscaye, P. E., (1965), Mineralogy and sedimentation of recent deep-sea clay in the Atlantic Ocean and adjacent seas and oceans. Geol. Soc. Am. Bull., 76, 803-832.
8. Borges, J., and, Y. Huh, (2007), Petrography and chemistry of the bed sediments of the Red River in China and Vietnam: Provenance and chemical weathering. Sedim. Geol., 194, 155-168. (Pubitemid 46075865)
9. Bouchez, J., M. Lupker, J. Gaillardet, C. France-Lanord, and, L. Maurice, (2011a), How important is it to integrate riverine suspended sediment chemical composition with depth? Clues from Amazon River depth-profiles. Geochim. Cosmochim. Acta, 75, 6955-6970.
10. Bouchez, J., J. Gaillardet, C. France-Lanord, L. Maurice, and, P. Dutra-Maia, (2011b), Grain size control of river suspended sediment geochemistry: clues from Amazon River depth profiles. Geochem. Geophys. Geosyst., 12, Q03008, doi: 10.1029/2010GC003380.
11. Braun, J. J., M. Pagel, J. P. Muller, P. Bilong, A. Michard, and, B. Guillet, (1990), Cerium anomalies in lateritic profiles. Geochim. Cosmochim. Acta, 54, 781-795.
12. Brinckmann, J., B. Lehmann, and, F. Timm, (1994), Proterozoic gold mineralization in NW Burundi. Ore Geol. Rev., 9, 85-103. (Pubitemid 24427332)
13. Brown, E. T., J. M. Edmond, G. M. Raisbeck, D. L. Bourlès, F. Yiou, and, C. I. Measures, (1992), Beryllium isotope geochemistry in tropical river basins. Geochim. Cosmochim. Acta, 56, 1607-1624.
14. Brown, D. J., P. A. Helmke, and, M. K. Clayton, (2003), Robust geochemical indices for redox and weathering on a granitic laterite landscape in central Uganda. Geochim. Cosmochim. Acta, 67, 2711-2723. (Pubitemid 36967531)
15. Buchwaldt, R., T. Toulkeridis, W. Todt, and, E. K. Ucakuwun, (2008), Crustal age domains in the Kibaran belt of SW-Uganda: Combined zircon geochronology and Sm-Nd isotopic investigation. J. Afr. Earth Sci., 51, 4-20.
16. Büttner, A., I. C. Kleinhanns, D. Rufer, J. C. Hunziker, and, I. M. Villa, (2005), Magma generation at the easternmost section of the Hellenic arc: Hf, Nd, Pb and Sr isotope geochemistry of Nisyros and Yali volcanoes (Greece). Lithos, 83, 29-46. (Pubitemid 40841323)
17. Canfield, D. E., (1997), The geochemistry of river particulates from the continental USA: Major elements. Geochim. Cosmochim. Acta, 61, 3349-3365.
18. Chamley, H., (1989), Clay sedimentology. 623 p. Springer, Berlin.
19. Cox, R., D. R. Lowe, and, R. L. Cullers, (1995), The influence of sediment recycling and basement composition on evolution of mudrock chemistry in the southwestern United States. Geochim. Cosmochim. Acta, 59, 2919-2940. (Pubitemid 26436035)
20. Deblond, A., L. E. Punzalan, A. Boven, and, L. Tack, (2001), The Malagarazi Supergroup of southeast Burundi and its correlative Bukoba Supergroup of northwest Tanzania: Neo- and Mesoproterozoic chronostratigraphic constraints from Ar-Ar ages on mafic intrusive rocks. J. Afr. Earth Sci., 29, 313-328.
21. De Mulder, M., J. Hertogen, S. Deutsch, and, L. André, (1986), The role of crustal contamination in the potassic suite of the Karisimbi volcano (Virunga, African Rift Valley). Chem. Geol., 57, 117-136.
22. Drever, J. I., (1994), The effect of land plants on weathering rates of silicate minerals. Geochim. Cosmochim. Acta, 58, 2325-2332. (Pubitemid 24405267)
23. Duchesne, J. C., J. P. Liégeois, A. Deblond, and, L. Tack, (2004), Petrogenesis of the Kabanga-Musongati layered mafic-ultramafic intrusions in Burundi (Kibaran Belt): Geochemical, Sr-Nd isotopic constraints and Cr-Ni behaviour. J. Afr. Earth Sci., 39, 133-145. (Pubitemid 39499699)
24. Dupré, B., J. Gaillardet, D. Rousseau, and, C. J. Allègre, (1996), Major and trace elements of river-borne material: The Congo Basin. Geochim. Cosmochim. Acta, 60, 1301-1321.
25. Ebinger, C. J., (1989), Tectonic development of the western branch of the East-African rift system. Geol. Soc. Am. Bull., 101, 885-903.
26. Ebinger, C., and, T. Furman, (2003), Geodynamical setting of the Virunga volcanic province. Acta Vulc., 14, 1-8.
27. Edmond, J. M., M. R. Palmer, C. I. Measures, E. T. Brown, and, Y. Huh, (1996), Fluvial geochemistry of the eastern slope of the northeastern Andes and its foredeep in the drainage of the Orinoco in Colombia and Venezuela. Geochim. Cosmochim. Acta, 60, 2949-2976.
28. Fernandez-Alonso, M., (2007), Geological Map of the Mesoproterozoic Northeastern Kibara Belt, 1:500.000. Royal Museum for Central Africa, Tervuren (Belgium).
29. Fernandez-Alonso, M., and, K. Theunissen, (1998), Airborne geophysics and geochemistry provide new insights in the intracontinental evolution of the Mesoproterozoic Kibaran belt (Central Africa). Geol. Mag., 135, 203-216. (Pubitemid 128556700)
30. Fernandez-Alonso, M., J. Lavreau, and, J. Klerkx, (1986), Geochemistry and geochronology of the Kibaran granites in Burundi, Central Africa: Implications for the Kibaran Orogeny. Chem. Geol., 57, 234-217.
31. Fernandez-Alonso, M., H. Cutten, B. De Waele, L. Tack, A. Tahon, D. Baudet, and, S. D. Barritt, (2012), The Mesoproterozoic Karagwe-Ankole Belt (former NE Kibaran belt): The result of prolonged extensional intracratonic basin development punctuated by two short-lived far-field compressional events. Precambrian Res., 216/219, 63-86.
32. Furman, T., and, D. Graham, (1999), Erosion of lithospheric mantle beneath the East African Rift system: Geochemical evidence from the Kivu volcanic province. Lithos, 48, 237-262. (Pubitemid 30034054)
33. Gaillardet, J., B. Dupré, and, C. J. Allègre, (1999), Geochemistry of large river suspended sediments: Silicate weathering or recycling tracer? Geochim. Cosmochim. Acta, 63, 4037-4051. (Pubitemid 30119232)
34. Gaillardet, J., J. Viers, and, B. Dupré, (2003), Trace elements in river waters, in Surface and ground water, weathering, erosion and soils, edited by, J.I. Drever, vol. 5, pp. 225-272, in Treatise on geochemistry, edited by, H.D. Holland, and, K.K. Turekian, Elsevier, Pergamon.
35. Garzanti, E., and, S. Andò, S. (2007), Plate tectonics and heavy-mineral suites of modern sands, in Heavy Minerals in Use, edited by M.A. Mange and D.T. Wright, Developments in Sedimentology Series, v. 58, pp. 741-763, Elsevier, Amsterdam.
36. Garzanti, E., G. Vezzoli, S. Andò, and, G. Castiglioni, (2001), Petrology of rifted-margin sand (Red Sea and Gulf of Aden, Yemen). J. Geol., 109, 277-297. (Pubitemid 32533512)
37. Garzanti, E., S. Andò, G. Vezzoli, A. Ali Abdel Megid, and A. El Kammar (2006), Petrology of Nile River sands (Ethiopia and Sudan): Sediment budgets and erosion patterns. Earth Planet. Sci. Lett., 252, 327-341. (Pubitemid 44774517)
38. Garzanti, E., S. Andò, and, G. Vezzoli, (2008), Settling-equivalence of detrital minerals and grain-size dependence of sediment composition. Earth Planet. Sci. Lett., 273, 138-151.
39. Garzanti, E., S. Andò, C. France-Lanord, G. Vezzoli, P. Censi, V. Galy, Y. Najman, (2010), Mineralogical and chemical variability of fluvial sediments. 1. Bedload sand (Ganga-Brahmaputra, Bangladesh). Earth Planet. Sci. Lett., 299, 368-381.
40. Garzanti, E., S. Andò, C. France-Lanord, V. Galy, P. Censi, and, P. Vignola, (2011), Mineralogical and chemical variability of fluvial sediments. 2. Suspended-load silt (Ganga-Brahmaputra, Bangladesh). Earth Planet. Sci. Lett., 302, 107-120.
41. Garzanti, E., A. Resentini, G. Vezzoli, S. Andò, M. Malusà, and, M. Padoan, (2012), Forward compositional modelling of Alpine orogenic sediments. Sedim. Geol., 280, 149-164.
42. Garzanti, E., M. Padoan, S. Andò, A. Resentini, G. Vezzoli, and, M. Lustrino, (in review). Weathering at the equator: petrology and geochemistry of East African Rift sands. J. Geol.
43. Goldstein, S. J., and, S. B. Jacobsen, (1988), The Nd and Sr isotopic systematics of river water suspended material: Implications for crustal evolution. Earth Planet. Sci. Lett., 87, 249-265.
44. Goldstein, S. L., R. K. O'Nions, and, P. J. Hamilton, (1984), A Sm-Nd isotopic study of atmospheric dusts and particulates from major river systems. Earth Planet. Sci. Lett., 70, 221-236.
45. Haley, B. A., G. P. Klinkhammer, and, J. McManus, (2004), Rare earth elements in pore waters of marine sediments. Geochim. Cosmochim. Acta, 68, 1265-1279. (Pubitemid 38403388)
46. Hildebrand, K., (1984). Étude des complexes granito-gneissiques de Cyimbili, Mara et Mutara, Republique Rwandaise (Afrique Centrale). PhD Thesis, University of Quebec at Chicoutimi, 249 pp.
47. Holmes, A., and, F. Harwood, (1937), The petrology of the volcanic area of Bufumbira. Memoirs of the Geological Survey of Uganda 3 (2), 300 pp.
48. Hu, Z., and, S. Gao, (2008), Upper crustal abundances of trace elements: A revision and update. Chem. Geol., 253, 205-221.
49. Ilunga, L., (1991), Morphologie, volcanisme et sédimentation dans le rift du Sud-Kivu. Bull. Soc. Géogr. Liège, 27, 209-228. (Pubitemid 23374976)
50. Johnsson, M. J., (1993), The system controlling the composition of clastic sediments, in Processes Controlling the Composition of Clastic Sediments, edited by M.J. Johnsson and A. Basu, Special Papers 284, pp. 1-19, Geol. Soc. Am.
51. Klerkx, J., J. P. Liégeois, J. Lavreau, and, W. Claessen, (1987), Crustal evolution of northern Kibaran belt in eastern and central Africa, in Proterozoic Crustal Evolution, edited by A. Kroner, Geodynamics Series 17, pp. 217-233, Am. Geophys. Union.
52. Kottek, M., J. Grieser, C. Beck, B. Rudolf, and, F. Rubel, (2006), World Map of the Köppen-Geiger climate classification updated. Meteorologische Zeitung, 15, 259-263. (Pubitemid 44027664)
53. Kronberg, B. I., H. W. Nesbitt, and, W. S. Fyfe, (1987), Mobilities of alkalis, alkaline earths and halogens during weathering. Chem. Geol., 60, 41-49.
54. Lehmann, B., S. Nakai, A. Höhndorf, J. Brinckmann, P. Dulski, U. F. Hein, and, A. Masuda, (1994), REE mineralization at Gakara, Burundi: Evidence for anomalous upper mantle in the western Rift Valley. Geochim. Cosmochim. Acta, 58, 985-992. (Pubitemid 24423836)
55. Link, K., D. Koehn, M. G. Barth, J. V. Tiberindwa, E. Barifaijo, K. Aanyu, and, S. F. Foley, (2010), Continuous cratonic crust between the Congo and Tanzania blocks in western Uganda. Int. J. Earth Sci., 99, 1559-1573.
56. Lugmair, G. W., N. B. Scheinin, and, K. Marti, (1975), Sm-Nd age and history of Apollo 17 basalt 7505: Evidence for early differentiation of the lunar exterior. Proc. 6th Lunar Science Conference, pp. 1419-1429.
57. Lupker, M., C. France-Lanord, J. Lavé, J. Bouchez, V. Galy, F. Métivier, J. Gaillardet, B. Lartiges, and, J. L. Mugnier, (2011), A Rouse-based method to integrate the chemical composition of river sediments: Application to the Ganga basin. J. Geophys. Res., 116, F04012, doi: 10.1029/2010JF001947.
58. Lupker, M., C. France-Lanord, V. Galy, J. Lavé, J. Gaillardet, A.P. Gajurel, C. Guilmette, M. Rahman, S.K. Singh, and, R. Sinha, (2012), Predominant floodplain over mountain weathering of Himalayan sediments (Ganga basin). Geochim. Cosmochim. Acta, 84, 410-432.
59. Maier, W. D., S. J. Barnes, D. Bandyayera, T. Livesey, C. Li, and, E. Ripley, (2008), Early Kibaran rift-related mafic-ultramafic magmatism in western Tanzania and Burundi: Petrogenesis and ore potential of the Kapalagulu and Musongati layered intrusions. Lithos, 101, 24-53.
60. Martin, J. M., and, M. Meybeck, (1979), Elemental mass-balance of material carried by major world rivers. Marine Chem., 7, 173-206.
61. Martin, J. M., A. J. Thomas, and, R. Van Grieken, (1978), Trace element composition of Zaire suspended sediments. Netherlands J. Sea Res., 12, 414-420.
62. McDonough, W. F., and, S. S. Sun, (1995), The composition of the Earth. Chem. Geol. 120, 223-253.
63. McLennan, S. M., (1989), Rare earth elements in sedimentary rocks: Influence of provenance and sedimentary processes. Rev. Miner. Geochem., 21, 169-200.
64. McLennan, S. M., (2001), Relationships between the trace element composition of sedimentary rocks and upper continental crustr. Geochem. Geophys. Geosyst., 2, 2000GC000109.
65. Middleburg, J. J., C. H. van der Weijden, and, J. R. W. Woittiez, (1988), Chemical processes affecting the mobility of major, minor and trace elements during weathering of granitic rocks. Chem. Geol., 68, 253-273.
66. Moeyersons, J., (2003), The topographic thresholds of hillslope incisions in southwestern Rwanda. Catena, 50, 381-400. (Pubitemid 36035779)
67. Moeyersons, J., P. Tréfois, J. Lavreau, D. Alimasi, I. Badriyo, B. Mitima, M. Mundala, D. O. Munganga, and, L. Nahimana, (2004), A geomorphological assessment of landslide origin at Bukavu, Democratic Republic of the Congo. Eng. Geol., 72, 73-87. (Pubitemid 38261641)
68. Moore, D. M., and, R. C. Reynolds, (1989), X-ray Diffraction and the Identification and Analysis of Clay Minerals., 332 pp. Oxford Univ. Press, New York.
69. Moquet, J. S., A. Crave, J. Viers, P. Seyler, E. Armijos, L. Bourrel, E. Chavarri, C. Lagane, A. Laraque, W.S. Lavado Casimiro, et al. (2011), Chemical weathering and atmospheric/soil CO2 uptake in the Andean and foreland Amazon basins. Chem. Geol., 287, 1-26.
70. Nägler, T. F., and, B. S. Kamber, (1996), A new silicate dissolution procedure for isotope studies on garnet and other rock forming minerals. Schweiz. miner. petrogr. Mitt., 76, 75-80.
71. Nägler, T. F., and, J. D. Kramers, (1998), Nd isotopic evolution of the upper mantle during the Precambrian: Models, data and the uncertainty of both. Precambrian Res., 91, 233-252.
72. Nagudi, B., C. Koeberl, and, G. Kurat, (2003), Petrography and geochemistry of the Singo granite, Uganda, interpretations and implications for its origin. J. Afr. Earth Sci., 36, 73-87. (Pubitemid 36685074)
73. Négrel, P., C. J. Allègre, B. Dupré, and, E. Lewin, (1993), Erosion sources determined by inversion of major and trace element ratios in river water: The Congo Basin case. Earth Planet. Sci. Lett., 120, 59-76. (Pubitemid 24402384)
74. Nesbitt, H. W., and, G. Markovics, (1997), Weathering of granodioritic crust, long-term storage of elements in weathering profiles, and petrogenesis of clastic sediments. Geochim. Cosmochim. Acta, 61, 1653-1670.
75. Nesbitt, H. W., and, G. M. Young, (1982), Early Proterozoic climates and plate motions inferred from major element chemistry of lutites. Nature, 299, 715-717.
76. Nesbitt, H. W., G. Markovics, and, R. C. Price, (1980), Chemical processes affecting alkalis and alkali earths during continental weathering. Geochim. Cosmochim. Acta, 44, 1659-1666.
77. Nesbitt, H. W., G. M. Young, S. M. McLennan, and, R. R. Keays, (1996), Effects of chemical weathering and sorting on the petrogenesis of siliciclastic sediments, with implications for provenance studies. J. Geol., 104, 525-542.
78. Nizeyimana, E., and, T. J. Bicki, (1992), Soil and soil-landscape relationships in the north central region of Rwanda, East-Central Africa. Soil Sci., 153, 225-236.
79. Nyakairu, G. W. A., and, C. Koeberl, (2001), Mineralogical and chemical composition and distribution of rare earth elements in clay-rich sediments from central Uganda. Geochem. J., 35, 13-28. (Pubitemid 32334032)
80. Nyakairu, G. W. A., C. Koeberl, and, H. Kurzweil, (2001), The Buwambo kaolin deposit in central Uganda: Mineralogical and chemical composition. Geochem. J., 35, 245-256. (Pubitemid 33056053)
81. Padoan, M., E. Garzanti, Y. Harlavan, and, I. M. Villa, (2011), Tracing Nile sediment sources by Sr and Nd isotope signatures (Uganda, Ethiopia, Sudan). Geochim. Cosmochim. Acta, 75, 3627-3644.
82. Parker, A., (1970), An index of weathering for silicate rocks. Geol. Mag., 107, 501-504.
83. Pohl, W., (1994), Metallogeny of the northeastern Kibara belt, Central Africa-Recent perspectives. Ore Geol. Rev., 9, 105-130. (Pubitemid 24428316)
84. Price, J. R., and, M. A. Velbel, (2003), Chemical weathering indices applied to weathering profiles developed on heterogeneous felsic metamorphic parent rocks. Chem. Geol., 202, 397-416.
85. Ring, U., (2008), Extreme uplift of the Rwenzori Mountains in the East African Rift, Uganda: Structural framework and possible role of glaciations. Tectonics, 27, TC4018, doi: 10.1029/2007TC002176.
86. Rogers, N. W., M. De Mulder, and, C. J. Hawkesworth, (1992), An enriched mantle source for potassic basanites: Evidence from Karisimbi volcano, Virunga volcanic province, Rwanda. Contrib. Miner. Petrol., 111, 543-556.
87. Rogers, N. W., D. James, S. P. Kelley, and, M. De Mulder, (1998), The generation of potassic lavas from the eastern Virunga Province, Rwanda. J. Petrol., 39, 1223-1247. (Pubitemid 28437811)
88. Rosenthal, A., S. F. Foley, D. G. Pearson, G. M. Nowell, and, S. Tappe, (2009), Petrogenesis of strongly alkaline primitive volcanic rocks at the propagating tip of the western branch of the East African Rift. Earth Planet. Sci. Lett., 284, 236-248.
89. Scarciglia, F., P. Tuccimei, A. Vacca, D. Barca, I. Pulice, R. Salzano, and, M. Soligo, (2011), Soil genesis, morphodynamic processes and chronological implications in two soil transects of SE Sardinia, Italy: Traditional pedological study coupled with laser ablation ICP-MS and radionuclide analyses. Geoderma, 162, 39-64.
90. Schlüter, T., (2008), Geological atlas of Africa. 307 pp. Springer Verlag, Berlin.
91. Shao, J., S. Yang, and, C. Li, (2012), Chemical indices (CIA and WIP) as proxies for integrated chemical weathering in China: Inferences from analysis of fluvial sediments. Sedim. Geol., 265-266, 110-120.
92. Shiller, A. M., and, D. M. Frilot, (1996), The geochemistry of gallium relative to aluminium in Californian streams. Geochim. Cosmochim. Acta, 60, 1323-1328.
93. Soil map of Rwanda (1994), Laboratory of Soil Science, University of Ghent, scale 1:50,000, http://zadeh.ugent.be/rwanda
94. Soreghan, M. J., and, A. S. Cohen, (1993), The effects of basin asymmetry on sand composition: Examples from Lake Tanganyika, Africa, in Processes Controlling the Composition of Clastic Sediments, edited by M.J. Johnsson and A. Basu, Spec. Pap. 284, pp. 285-301, Geol. Soc. Am.
95. Stallard, R. F., (1988), Weathering and erosion in the humid tropics, in Physical and Chemical Weathering in Geochemical Cycles, edited by A. Lerman and M. Meybeck, NATO Science Series C, Mathematical and physical sciences, 251, pp. 225-246, Kluwer, Dordrecht.
96. Sutcliffe, J. V., and, Y. P. Parks, (1999), The hydrology of the Nile. Int. Ass. Hydrol. Sci., Spec. Publ. 5, 179 p.
97. Tack, L., J. P. Liégeois, A. Deblond, and, J. C. Duchesne, (1994), Kibaran A-type granitoids and mafic rocks generated by two mantle sources in a late orogenic setting (Burundi). Precambrian Res., 68, 323-356.
98. Tack, L., M. T. D. Wingate, B. De Waele, J. Meerte, E. Belousova, B. Griffin, A. Tahon, and, M. Fernandez-Alonso, (2010), The 1375 Ma "Kibaran event" in Central Africa: Prominent emplacement of bimodal magmatism under extensional regime. Precambrian Res., 180, 63-84.
99. Tauler, E., J. A. Proenza, S. Galí, J. F. Lewis, M. Labrador, E. García-Romero, M. Suarez, F. Longo, and, G. Bloise, (2009), Ni-sepiolite-falcondoite in garnierite mineralization from the Falcondo Ni-laterite deposit, Dominican Republic. Clay Miner., 44, 435-454.
100. Taylor, R. G., and, K. W. F. Howard, (1999), The influence of tectonic setting on the hydrological characteristics of deeply weathered terrains: Evidence from Uganda. J. Hydrol., 218, 44-71. (Pubitemid 29239805)
101. Taylor, R. G., L. Mileham, C. Tindimugaya, and, L. Mwebembezi, (2009), Recent glacial recession and its impact on alpine riverflow in the Rwenzori Mountains of Uganda. J. Afr. Earth Sci., 55, 205-213.
102. Taylor, S. R., and, S. M. McLennan, (1985), The Continental Crust: Its Composition and Evolution. 312 p. Blackwell Scientific, Boston.
103. Taylor, S. R., and, S. M. McLennan, (1995), The geochemical evolution of the continental crust. Rev. Geophys., 33, 241-265.
104. Velbel, M. A., (1993), Temperature dependence of silicate weathering in nature: How strong a negative feedback on long-term accumulation of atmospheric CO2 and global greenhouse warming. Geology, 21, 1059-1062. (Pubitemid 24398091)
105. Velde, B., (1995), Origin and Mineralogy of Clays. 371 p. Springer, Berlin.
106. Viers, J., B. Dupré, and, J. Gaillardet, (2009), Chemical composition of suspended sediments in world rivers: New insights from a new database. Sci. Total Environ., 407, 853-868.
107. Vollmer, R., and, M. J. Norry, (1983), Possible origin of K-rich volcanic rocks from Virunga, East Africa, by metasomatism of continental crustal material: Pb, Nd and Sr isotopic evidence. Earth Planet. Sci. Lett., 64, 374-386.
108. Young, G. M., and, H. W. Nesbitt, (1998), Processes controlling the distribution of Ti and Al in weathering profiles, siliciclastic sediments and sedimentary rocks. J. Sedim. Res., 68, 448-455.
109. Wasserburg, G. J., S. B. Jacobsen, D. J. DePaolo, M. T. McCulloch, and, T. Wen, (1981), Precise determination of Sm/Nd ratios, Sm and Nd isotopic abundances in standard solutions. Geochim. Cosmochim. Acta, 45, 2311-2323.
110. White, A. F., and, A. E. Blum, (1995), Effects of climate on chemical weathering in watersheds. Geochim. Cosmochim. Acta, 59, 1729-1747.
111. White, A. F., T. D. Bullen, M. S. Schulz, A. E. Blum, T. G. Huntington, and, N. E. Peters, (2001), Differential rates of feldspar weathering in granitic regoliths. Geochim. Cosmochim. Acta, 65, 847-869. (Pubitemid 32296341)
112. Wilson, M. J., (1999), The origin and formation of clay minerals in soils: Past, present and future perspectives. Clay Miner., 34, 7-25. (Pubitemid 30170501)