Petrogenesis of strongly alkaline primitive volcanic rocks at the propagating tip of the western branch of the East African Rift

Earth and Planetary Science Letters

Volumn 284, Issue 1-2, 2009, Pages 236-248

  Rosenthal, A ^a,b   Foley, S F ^a,b   Pearson, D G ^c   Nowell, G M ^c   Tappe, S ^a,d  

^a JOHANNES GUTENBERG UNIVERSITY   (Germany)

^b AUSTRALIAN NATIONAL UNIVERSITY   (Australia)

^c DURHAM UNIVERSITY   (United Kingdom)

^d De Beers Canada Inc   (Canada)

Author keywords

alkaline rocks; East African Rift; kamafugite; mantle metasomatism; rift volcanism; Sr Nd Hf Os isotopes

Indexed keywords

ALKALINE ROCKS; EAST AFRICAN RIFT; KAMAFUGITE; MANTLE METASOMATISM; RIFT VOLCANISM; SR-ND-HF-OS ISOTOPES;

CARBONATION; HAFNIUM; ISOTOPES; MICA; MINERALOGY; NEODYMIUM; OSMIUM; SILICA; SILICATES; VOLCANIC ROCKS; VOLCANOES;

STRONTIUM;

ALKALINE ROCK; HAFNIUM; METASOMATISM; NEODYMIUM ISOTOPE; OSMIUM ISOTOPE; PETROGENESIS; RIFT ZONE; STRONTIUM ISOTOPE; VOLCANIC ROCK; VOLCANISM;

AFRICA; EAST AFRICA; EAST AFRICAN RIFT; SUB-SAHARAN AFRICA; UGANDA;

EID: 67449093507     PISSN: 0012821X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.epsl.2009.04.036     Document Type: Article

References (110)

1. Andronikov A.V., and Foley S.F. Trace element and Nd-Sr isotopic composition of ultramafic lamprophyres from the East Antarctic Beaver Lake area. Chem. Geol. 175 3-4 (2001) 291-305
2. Araujo A.L.N., Carlson R.W., Gaspar J.C., and Bizzi L.A. Petrology of kamafugites and kimberlites from the Alto Paranaiba Alkaline Province, Minas Gerais, Brazil. Contrib. Mineral. Petrol. 142 2 (2001) 163-177
3. Barker D.S., and Nixon P.H. High-Ca, low-alkali carbonatite volcanism at Fort-Portal, Uganda. Contrib. Mineral. Petrol. 103 2 (1989) 166-177
4. Bell K., and Blenkinsop J. Archean depleted mantle: Evidence from Nd and Sr initial isotopic ratios of carbonatites. Geochim. Cosmochim. Acta 51 2 (1987) 291-298
5. Bell K., and Blenkinsop J. Nd and Sr isotopic compositions of East African carbonatites: implications for mantle heterogeneity. Geol. 15 (1987) 99-102
6. Bell K., and Powell J.L. 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 3 (1969) 536-572
7. Bennett V.C., Esat T.M., and Norman M.D. Two mantle-plume components in Hawaiian picrites inferred from correlated Os-Pb isotopes. Nature 381 16 (1996) 221-224
8. Blichert-Toft J., and Albarede F. The Lu-Hf isotope geochemistry and chondrites and the evolution of the mantle-crust system. Earth Planet. Sci. Lett. 148 (1997) 243-258
9. Boven A., Pasteels P., Punzalan L.E., Yamba T.K., and Musisi J.H. Quaternary perpotassic magmatism in Uganda (Toro-Ankole Volcanic Province): age assessment and significance for magmatic evolution along the East African Rift. J. Afr. Earth Sci. 26 (1998) 463-476
10. Brandon A.D., Norman M.D., Walker R.J., and Morgan J.W. 186Os/187Os systematics of Hawaiian picrites. Earth Planet. Sci. Lett. 174 (1999) 25-42
11. Brey G.P. Origin of olivine melilitites - chemical and experimental constraints. J. Volcanol. Geotherm. Res. 3 (1978) 61-88
12. Carlson R.W., and Irving A.J. Depletion and enrichment history of subcontinental lithospheric mantle: An Os, Sr, Nd and Pb isotopic study of ultramafic xenoliths from the northwestern Wyoming Craton. Earth Planet. Sci. Lett. 126 4 (1994) 457-472
13. Carlson, R.W., Nowell, G.M., 2001. Olivine-poor sources for mantle-derived magmas: Os and Hf isotopic evidence from potassic magmas of the Colorado Plateau. G-cubed 2 2000GC000128.
14. Carlson R.W., Esperanca S., and Svisero D.P. Chemical and Os isotopic study of cretaceous potassic rocks from southern Brazil. Contrib. Mineral. Petrol. 125 (1996) 393-405
15. Carlson R.W., Araujo A.L.N., Junqueira-Brod T.C., Gaspar J.C., Brod J.A., Petrinovic I.A., Hollanda M.H.B.M., Pimentel M.M., and Sichel S. Chemical and isotopic relationships between peridotite xenoliths and mafic-ultrapotassic rocks from Southern Brazil. Chem. Geol. 242 3-4 (2007) 415-434
16. Chakrabarti R., Basu A.R., and Paul D.K. Nd-Hf-Sr-Pb isotopes and trace element geochemistry of Proterozoic lamproites from southern India: subducted komatiite in the source. Chem. Geol. 236 (2007) 291-302
17. Chakrabarti R., Basu A.R., Santo A.P., Tedesco D., and Vaselli O. Isotopic and geochemical evidence for a heterogeneous mantle plume origin of the Virunga volcanics, Western rift, East African Rift system. Chem. Geol. 259 (2009) 273-289
18. Combe A., and Holmes A. The kalsilite-bearing lavas of Kabirenge and Lyakauli, South-West Uganda. Trans. R. Soc. Edinb. 61 (1945) 359-379
19. Davies G.R., and Lloyd F.E. Pb-Sr-Nd isotope and trace element data bearing on the origin of the potassic subcontinental lithosphere beneath south west Uganda. In: Ross J. (Ed). Kimberlites and Related Rocks 1. Geol. Soc. Aust. Spec. Publ. vol. 14 (1989), Blackwell, Melbourne 784-794
20. Davies G.R., Stolz A.J., Mahotkin I.L., Nowell G.M., and Pearson D.G. Trace Element and Sr-Pb-Nd-Hf Isotope Evidence for Ancient, Fluid-Dominated Enrichment of the Source of Aldan Shield Lamproites. J. Petrol. 47 6 (2006) 1119-1146
21. Dawson J., and Smith J. Metasomatised and veined upper-mantle xenoliths from Pello Hill, Tanzania: evidence for anomalously-light mantle beneath the Tanzanian sector of the East Africa Rift Valley. Contrib. Mineral. Petrol. 100 (1988) 510-527
22. Denaeyer, M.E., Schellinck, F., Coppez, A., 1965. Recueil d'analyses des laves du Fossé tectonique de L'Afrique Centrale. Ann. Mus. R. Afr. Cent., Tervuren, Belg., Sér. 8. degree., Sci. Geol. 49, 234 pp.
23. Doucet, S., Scoates, J.S.a., Weis, D., Giret, A., 2005. Constraining the components of the Kerguelen mantle plume: A Hf-Pb-Sr-Nd isotopic study of picrites and high-MgO basalts from the Kerguelen Archipelago. G-cubed 6 (4), doi:10.1029/2004GC000806.
24. Ebinger C.J. Geometric and kinematic development of border faults and accommodation zomes, Kivu-Rusizi Rift, Africa. Tectonics 8 (1989) 117-133
25. Ebinger C.J. Tectonic development of the western branch of the East-African rift system. Geol. Soc. Am. Bull. 101 (1989) 885-903
26. Ebinger C.J., Jackson J.A., Foster A.N., and Hayward N.J. Extensional basin geometry and the elastic lithosphere. Philos. Trans. R. Soc. Lond. 357 (1999) 741-762
27. Ebinger C.J., Yemane T., Harding D.J., Tesfaye S., Kelley S., and Rex D.C. Rift deflection, migration, and propagation: linkage of the Ethiopian and Eastern rifts, Africa. Geol. Soc. Am. Bull. 112 (2000) 163-176
28. Edgar A.D., and Vukadinovic D. Implications of experimental petrology to the evolution of ultrapotassic rocks. Lithos 28 (1992) 205-220
29. 2 cause partial melting in low-velocity layer of mantle?. Geology 4 (1976) 69-72
30. Escrig S., Doucelance R., Moreira M., and Allegre C.J. Os isotope systematics in Fogo Island: Evidence for lower continental crust fragments under the Cape Verde Southern Islands. Chem. Geol. 219 (2005) 93-113
31. Falloon T.J., and Green D.H. The solidus of carbonated, fertile peridotite. Earth Planet. Sci. Lett. 94 (1989) 364-370
32. Foley S. High-pressure stability of the fluor- and hydroxy-endmembers of pargasite and K-richterite. Geochim. Cosmochim. Acta 55 (1991) 2689-2694
33. Foley S.F. Petrological characterization of the source components of potassic magmas - geochemical and experimental constraints. Lithos 28 (1992) 187-204
34. Foley S.F. Vein-plus-wall-rock melting mechanisms in the lithosphere and the origin of potassic alkaline magmas. Lithos 28 (1992) 435-453
35. Foley S.F. Volcanoes and volcanic sources in the East African rift. Proc. Belgian Acad. Sci. (2007) 43-55
36. Foley S. Rejuvenation and erosion of the cratonic lithosphere. Nat. Geosci. 1 (2008) 503-510
37. Foley S.F., and Jenner G.A. Trace element partitioning in lamproitic magmas - the Gaussberg olivine leucitite. Lithos 75 (2004) 19-38
38. Foley S.F., Venturelli G., Green D.H., and Toscani L. The Ultrapotassic rocks - characteristics, classification, and constraints for petrogenetic models. Earth Sci. Rev. 24 (1987) 81-134
39. Foley S.F., van der Laan S.R., and Horn I. Experimental melting reactions in amphibole- and phlogopite-bearing mantle vein assemblages and the trace element compositions of derived partial melts. 6th International Kimberlite Conference, Extended Abstracts (1995) 161-163
40. Foley, S.F., Musselwhite, D.S., van der Laan, S.R., 1999. Melt Compositions from Ultramafic Vein Assemblages in the Lithospheric Mantle: A Comparison of Cratonic and Non-Cratonic Settings. In: J.J.G. et. al., (Ed), J.B. Dawson volume, Red Roof, Cape Town, 1999, pp. 238-246.
41. Foley S.F., Andronikov A.V., and Melzer S. Petrology of ultramafic lamprophyres from the Beaver Lake area of Eastern Antarctica and their relation to the breakup of Gondwanaland. Mineral. Petrol. 74 (2002) 361-384
42. 2O between 40 and 60 kbar. Lithos. doi:10.1016/j.lithos.2009.03.020.
43. Furman T. Melting of metasomatized subcontinental lithosphere - undersaturated mafic lavas from Rungwe, Tanzania. Contrib. Mineral. Petrol. 122 (1995) 97-115
44. Furman T., and Graham D. Erosion of lithospheric mantle beneath the East African Rift system: geochemical evidence from the Kivu volcanic province. Lithos 48 (1999) 237-262
45. Gaffney A.M., Blichert-Toft J., Nelson B.K., Bizzarro M., Rosing M., and Albarede F. Constraints on source-forming processes of West Greenland kimberlites inferred from Hf-Nd isotope systematics. Geochim. Cosmochim. Acta 71 (2007) 2820-2836
46. Gangopadhyay A., and Walker R.J. Re-Os systematics of the ca. 2.7-Ga komatiites from Alexo, Ontario, Canada. Chem. Geol. 196 1-4 (2003) 147-162
47. Gannoun A., Burton K.W., Parkinson I.J., Alard O., Schiano P., and Thomas L.E. The scale and origin of the osmium isotope variations in mid-ocean ridge basalts. Earth Planet. Sci. Lett. 259 (2007) 541-556
48. Gibson S.A., Thompson R.N., Leonardos O.H., Dickin A.P., and Mitchell J.G. The Late Cretaceous impact of the Trinidad mantle plume - evidence from large-volume, mafic, potassic magmatism in SE Brazil. J. Petrol. 36 (1995) 189-229
49. Green D.H. Experimental studies on a model upper mantle composition at high-pressure under water-saturated and water-undersaturated conditions. Earth Planet. Sci. Lett. 19 (1973) 37-53
50. Green D.H., and Falloon T.J. Primary magmas at mid-ocean ridges, "hotspots," and other intraplate settings: constraints on mantle potential temperature. In: Foulger G.R., Natland J.H., Presnall D.C., and Anderson D.L. (Eds). Plates, Plumes, and Paradigms: Geological Society of America Special Paper vol. 388 (2005) 217-247
51. Holmes A. The petrology of katungite. Geol. Mag. 74 (1937) 200-219
52. 4). Mineral. Mag. 26 (1942) 197-217
53. Holmes A. Petrogenesis of katungite and its associates. Am. Mineral. 35 (1950) 772-792
54. Holmes A., and Harwood H.F. Petrology of the volcanic fields east and southeast of Ruwenzori, Uganda. Q. J. Geol. Soc. Lond. 88 (1932) 370-442
55. Holmes A., and Harwood H.F. The Volcanic Area of Bufumbira (Part II). Geol. Surv. Uganda Memoir, Kampala (1937) 300 pp.
56. Horan M.F., Walker R.J., Fedorenko V.A., and Czamanske G.K. Osmium and neodymium isotopic constraints on the temporal and spatial evolution of Siberian flood basalt sources. Geochim. Cosmochim. Acta 59 24 (1995) 5159-5168
57. Janney P.E., Le Roex A.P., Carlson R.W., and Viljoen K.S. A chemical and multi-isotope study of the Western Cape olivine melilitite province, South Africa: implications for the sources of kimberlites and the origin of the HIMU signature in Africa. J. Petrol. 43 (2002) 2339-2370
58. Kampunzu A.B., and Mohr P. Magmatic evolution and petrogenesis in the East African Rift system. In: Kampunzu A.B., and Lubala R.T. (Eds). Magmatism in Extensional Structural Settings: the Phanerozoic African Plate (1991), Springer, Berlin 85-136
59. Kokonyangi J.W., Kampunzu A.B., Armstrong R.A., Arima M., Yoshida M., Yoshida M., and Okudaira T. U-Pb SHRIMP dating of detrial zircons from the Nzilo group (Kibaran Belt): implications for the source of sediments and mesoproterozoic evolution of central Africa. J. Geol. 115 (2007) 99-113
60. Konzett J., and Ulmer P. The stability of hydrous potassic phases in lherzolitic mantle-an experimental study to 9.5 GPa in simplified and natural bulk compositions. J. Petrol. 40 4 (1999) 629-652
61. Lambert D.D., Shirey S.B., and Bergman S.C. Proterozoic lithospheric mantle source for the Prairie Creek lamproites - Re-Os and Sm-Nd isotopic evidence. Geology 23 (1995) 273-276
62. Laughlin A.W., Charles R.J., and Aldrich M.J. Heteromorphism and crystallization paths of katungites, Navajo Volcanic Field, Arizona. In: Ross J. (Ed). Kimberlites and Related Rocks (1989), Blackwell, Melbourne 582-591
63. Lloyd F.E., Nixon P.H., Hornung G., and Condliffe E. Regional K-metasomatism in the mantle beneath the west branch of the East African rift: alkali clinopyroxenite xenoliths in highly potassic magmas. In: Nixon P.H. (Ed). Mantel Xenoliths (1987), Wiley, Lond. 641-659
64. Luguet A., Pearson D.G., Nowell G.M., Dreher S.T., Coggon J.A., Spetsius Z.V., and Parman S.W. Enriched Pt-Re-Os isotope systematics in plume lavas explained by metasomatic sulfides. Science 319 (2008) 453-456
65. Luhr J.F. Extensional tectonics and the diverse primitive volcanic rocks in the western Mexican Volcanic Belt. Can. Mineral. 35 (1997) 473-500
66. Mengel K., and Green D.H. Stability of amphibole and phlogopite in metasomatized peridotite under water-saturated and water-undersaturated conditions. In: Ross J. (Ed). Kimberlites and Related Rocks 1 (1989), Blackwell, Melbourne 571-581
67. Morley C.K. Tectonic evolution of the East African Rift system and the modifying influence of magmatism: a review. Acta vulcanologica 11 1 (1999) 1-19
68. Niida K., and Green D.H. Stability and chemical composition of pargastic amphibole in MORB pyrolite under upper mantle conditions. Contrib. Mineral. Petrol. 135 (1999) 18-40
69. Nixon P. Kimberlitic volcanoes in East Africa. Oversea Geol. Mineral. Resources, Inst. Geol. Sci. 41 (1973) 119-138
70. Nowell G.M., Kempton P.D., Noble S.R., Fitton J.G., Saunders A.D., Mahoney J.J., and Taylor R.N. High precision Hf isotope measurements of MORB and OIB by thermal ionisation mass spectrometry: insights into the depleted mantle. Chem. Geol. 149 (1998) 211-233
71. Nowell G.M., Pearson D.G., Bell D.R., Carlson C.B., Smith C.B., Kempton P.D., and Noble S.R. Hf isotope systematics of kimberlites and their megacrysts: new constraints on their mantle source regions. J. Petrol. 45 (2004) 1583-1612
72. Nyblade A.A., and Brazier R.A. Precambrian lithospheric controls on the development of the East African rift system. Geology 30 (2002) 755-758
73. O'Brien H.E., Irving A.J., McCallum S., and Thirlwall M.F. Strontium, neodymium, and lead isotopic evidence for the interaction of postsubduction asthenospheric potassic mafic magmas of the Highwood Mountains, Montana, USA, with ancient Wyoming craton lithospheric mantle. Geochim. Cosmochim. Acta 59 (1995) 4539-4556
74. Pearson D.G., and Nowell G.M. Re-Os and Lu-Hf isotope constraints on the origin and age of pyroxenites from the Beni Bousera peridotite massif: implications for mixed peridotite-pyroxenite mantle sources. J. Petrol. 45 (2004) 439-455
75. Pearson D.G., Rogers N.W., Irving A.J., and Smith C.B. Source regions of kimberlites and lamproites: constraints from Re-Os isotopes. Extended Abstracts, 6th Int. Kimberlite Conf., Novosibirsk (1995) 430-432
76. Pearson D.G., Shirey S.B., Carlson R.W., Boyd F.R., Pokhilenko N.P., and Shimizu N. Re-Os, Sm-Nd, and Rb-Sr Isotope Evidence for Thick Archean Lithospheric Mantle beneath the Siberian Craton Modified by Multistage Metasomatism. Geochim. Cosmochim. Acta 59 5 (1995) 959-977
77. Pearson D.G., Irvine G.J., Ionov D.A., Boyd F.R., and Dreibus G.E. Re-Os isotope systematics and platinum group element fractionation during mantle melt extraction: a study of massif and xenolith peridotite suites. Chem. Geol. 208 (2004) 29-59
78. Platz T., Foley S.F., and Andre L. Low-pressure fractionation of the Nyiragongo volcanic rocks, Virunga Province, DR Congo. J. Volcanol. Geotherm. Res. 136 (2004) 269-295
79. Pouclet A. Contribution à la systématique des laves du rift de l'Afrique Centrale (Zaire-Uganda). Bull. Volcanol. 43 (1980) 527-540
80. Pouclet, A., Menot, R.P., Piboule, M., 1981. Discriminant Factor Analysis Applied to Central-Africa Rift Lavas (Zaire, Rwanda, Uganda). Comptes Rendus De L Academie Des Sciences Serie II, 292, 8, 679-&.
81. Prelevic D., Foley S.F., Romer R.L., Cvetkovic V., and Downes H. Tertiary ultrapotassic volcanism in Serbia: constraints on petrogenesis and mantle source characteristics. J. Petrol. 46 (2005) 1443-1487
82. Puchtel I.S., Brandon A.D., Humayun M., and Walker R.J. Evidence for the early differentiation of the core from Pt-Re-Os isotope systematics of 2.8-Ga komatiites. Earth Planet. Sci. Lett. 237 (2005) 118-134
83. Ridley W.I., and Dawson J.B. Lithophile trace element data bearing on the origin of peridotite xenoliths, ankaramite and carbonatite form the Lashaine volcano, Tanzania. Phys. Chem. Earth 9 (1975) 559-569
84. Rogers N.W., Demulder M., and Hawkesworth C.J. An enriched mantle source for potassic basanites - evidence from Karisimbi volcano, Virunga volcanic province, Rwanda. Contrib. Mineral. Petrol. 11 (1992) 543-556
85. Rogers N.W., James D., Kelley S.P., and De Mulder M. The generation of potassic lavas from the eastern Virunga province, Rwanda. J. Petrol. 39 (1998) 1223-1247
86. Rosenthal A., Foley S.F., Pearson D.G., Nowell G.M., and Tappe S. Origin of kamafugite magmas in the East African Rift of western Uganda. 9th International Kimberlite Conference Extended Abstract 9IKC-A-00210 (2008)
87. Rudnick R., and McDonough W. Carbonatite metasomatism in the northern Tanzanian mantle: petrographic and geochemical characteristics. Earth Planet. Sci. Lett. 114 (1993) 463-475
88. Rudnick R., Ireland T.R., Gehrels G., Irving A.J., Chesley J.T., and Hanchar J.M. Dating mantle metasomatism: U-Pb geochronology of zircons in cratonic mantle xenoliths from Montana and Tanzania. In: Gurney J.J., Gurney J.L., Pascoe M.D., and Richardson S.R. (Eds). Proc. 7th Int. Kimberlite Conf. vol. 2 (1999) 728-735
89. Sahama T.G. Potassium-rich alkaline rocks. In: Sorensen H. (Ed). The Alkaline Rocks (1974), Wiley, London 96-109
90. Salters V.J.M., and White W.M. Hf isotope constraints on mantle evolution. Chem. Geol. 145 3-4 (1998) 447-460
91. Sgarbi P.B.A., and Gaspar J.C. Geochemistry of Santo Antonio da Barra Kamafugites, Goias, Brazil. J. South Am. Earth Sci. 14 (2002) 889-901
92. Simiyu S.M., and Keller G.R. An integrated analysis of lithospheric structure across the East African plateau based on gravity anomalies and recent seismic studies. Tectonophysics 278 (1997) 291-313
93. Stoppa F., Woolley A.R., Lloyd F.E., and Eby G.N. Carbonatite lapilli-bearing tuff and a dolomite carbonatite bomb from Murumuli crater, Katwe volcanic field, Uganda. Mineral. Mag. 64 (2000) 641-650
94. Tappe S., Foley S., and Pearson D.G. The Kamafugites of Uganda: a mineralogical and geochemical comparison with their Italian and Brazilian analogues. Period. Mineral. 72 (2003) 51-77
95. Tappe S., Jenner G.A., Foley S.F., Heaman L.M., Besserer D., Kjarsgaard B.A., and Ryan B. Tomgat ultramafic lamprophyres and their relation to the north Atlantic alkaline province. Lithos 76 (2004) 491-518
96. Tappe S., Foley S.F., Jenner G.A., Heaman L.M., Kjarskaard B.A., Romer R.L., Stracke A., Joyce N., and Hoefs J. Genesis of ultramafic lamprophyres and carbonatites at Aillik Bay, Labrador: a consequence of incipient lithospheric thinning beneath the North Atlantic craton. J. Petrol. 47 (2006) 1261-1315
97. Tappe S., Foley S.F., Stracke A., Romer R.L., Kjarsgaard B.A., Heaman L.M., and Joyce N. Craton reactivation on the Labrador Sea margins: Ar-40/Ar-39 age and Sr-Nd-Hf-Pb isotope constraints from alkaline and carbonatite intrusives. Earth Planet. Sci. Lett. 256 (2007) 433-454
98. Tappe S., Foley S.F., Kjarsgaard B.A., Romer R.L., Heaman L.M., Stracke A., and Jenner G.A. Between carbonatite and lamproite - Diamondiferous Torngat ultramafic lamprophyres formed by carbonate-fluxed melting of cratonic MARID-type metasome. Geochim. Cosmochim. Acta 72 (2008) 3258-3286
99. Vollmer R., and Norry M.J. Possible origin of K-rich volcanic rocks from Virunga, East Africa, by metasomatism of continental crust material: Pb, Nd and Sr isotopic evidence. Earth Planet. Sci. Lett. 64 (1983) 374-386
100. Vollmer R., and Norry M.J. Unusual isotopic variations in Nyiragongo nephelinites. Nature 301 (1983) 141-143
101. Walker R.J., Storey M., Kerr A.C., Tarney J., and Arndt N.T. Implications of Os-187 isotopic heterogeneities in a mantle plume: Evidence from Gorgona Island and Curacao. Geochim. Cosmochim. Acta 63 5 (1999) 713-728
102. Weeraratne D.S., Forsyth D.W., Fischer K.M., and Nyblande A.A. Evidence for an upper mantle plume beneath the Tanzanian craton from Rayleigh wave tomography. J. Geophys. Res. 108 B9 (2003) 2427 10.1029/2002JB002273
103. 2 at high pressures and high temperatures. Am. J. Sci. 280 (1980) 421-458
104. Widom E., Hoernle K.A., Shirey S.B., and Schmincke H.U. Os isotope systematics in the Canary Islands and Madeira: Lithospheric contamination and mantle plume signatures. J. Petrol. 40 2 (1999) 279-296
105. Williams L.A.J. The Kenya Rift volcanics: a note on volumes and chemical compositions. Tectonophysics 15 (1972) 83-96
106. Williams L.A.J. Physical aspects of magmatism in continental rifts. In: Palmasson G. (Ed). Continental and Oceanic Rifts. Am. Geophys. Union, Geodynamic Series 8, Washington (1982) 193-222
107. Woodland S.J., Pearson D.G., and Thirlwall M.F. A platinum group element and Re-Os isotope investigation of siderophile element recycling in subduction zones: Comparison of Grenada, Lesser Antilles arc, and the Izu-Bonin arc. J. Petrol. 43 1 (2002) 171-198
108. 2O by carbonates, amphibole, and phlogopite. J. Geol. 86 (1978) 687-713
109. 2 at mantle pressures with geophysical and petrological applications. Contrib. Mineral. Petrol. 54 (1976) 79-107
110. Zeyen H., Volker F., Wehrle V., Fuchs K., Sobolev S.V., and Altherr R. Styles of continental rifting: crust-mantle detachment and mantle plumes. Tectonophysics 278 (1997) 329-352