Determining melt productivity of mantle sources from 238U-230Th and 235U-231Pa disequilibria; an example from Pico Island, Azores

Geochimica et Cosmochimica Acta

Volumn 73, Issue 7, 2009, Pages 2103-2122

  Prytulak, J ^a   Elliott, T ^a  

^a UNIVERSITY OF BRISTOL   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

DISEQUILIBRIUM; IGNEOUS GEOCHEMISTRY; LITHOLOGY; MAGMA CHEMISTRY; MANTLE SOURCE; MELT INCLUSION; PERIDOTITE; PROTACTINIUM; THORIUM ISOTOPE; URANIUM ISOTOPE;

ATLANTIC ISLANDS; ATLANTIC OCEAN; AZORES; EURASIA; EUROPE; MACARONESIA; PICO; PORTUGAL; SOUTHERN EUROPE;

EID: 61849155327     PISSN: 00167037     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.gca.2009.01.001     Document Type: Article

References (156)

1. Albarède F. (2005) The survival of mantle geochemical heterogeneities. In AGU Geophys. Mono. Earth's Deep Mantle; Structure, Composition, and Evolution, vol. 160 (eds. R. van der Hilst, J. D. Bass, J. Matas and J. Trampert), pp. 27-46. American Geophysical Union, Washington DC, USA.
2. Allègre C.J., and Turcotte D.L. Implications of a 2-component marble-cake mantle. Nature 323 (1986) 123-127
3. Asimow P.D., Hirschmann M.M., Ghiorso M.S., O'Hara M.J., and Stolper E.M. The effect of solid-solid phase transition on decompression melting of the mantle. Geochim. Cosmochim. Acta 59 (1995) 4489-4506
4. Asimow P.D., Hirschmann M.M., and Stolper E.D. An analysis of variations in isentropic melt productivity. Phil. Trans. Roy. Soc. Lond. Ser. A 355 (1997) 255-281
5. Asimow P.D., Hirschmann M.M., and Stolper E.D. Calculation of peridotite partial melting from thermodynamic models of minerals and melts, IV. Adiabatic decompression and the composition and mean properties of mid-ocean ridge basalts. J. Petrol. 42 (2001) 963-998
6. Asimow P.D. Melt migration vs. isentropic decompression melting, more or less. Geochim. Cosmochim. Acta 66 Suppl. (2002) A34
7. Beattie P. Uranium-thorium disequilibria and partitioning on melting of garnet peridotite. Nature 363 (1993) 63-65
8. Beier C., Stracke A., and Haase K.M. The peculiar geochemical signature of São Miguel (Azores) lavas: metasomatised or recycled sources?. Earth Planet. Sci. Lett. 259 (2007) 186-199
9. Blundy J.D., Falloon T.J., Wood B.J., and Dalton J.A. Sodium partitioning between clinopyroxene and silicate melts. J. Geophys. Res. 100 (1995) 15501-15515
10. Blundy J. and Wood B. (2003) Mineral-melt partitioning of uranium, thorium, and their daughters. In Uranium-Series Geochemistry, Reviews in Mineralogy and Geochemistry, vol. 52 (eds. B. Bourdon, G. M. Henderson, C. C. Lundstrom and S. P. Turner), pp. 59-118. The Mineralogical Society of America. Washington DC, USA.
11. Bonatti E. Not so hot 'hot spots' in the oceanic mantle. Science 250 (1990) 107-110
12. Booth B., Croasdale R., and Walker G.P.L. Quantitative study of 5000 years of volcanism on São Miguel, Azores. Phil. Trans. Roy. Soc. Lond. Ser. A 288 (1978) 271-319
13. 230Th disequilibria data. Nature 384 (1996) 231-235
14. Bourdon B., Joron J.-L., Claude-Ivanaj C., and Allègre C.J. U-Th-Pa-Ra systematics for the Grande Comore volcanics: melting processes in an upwelling plume. Earth Planet. Sci. Lett. 164 (1998) 119-133
15. Bourdon B. and Sims K. W. W. (2003) U-series constraints on intraplate basaltic magmatism. In Uranium-Series Geochemistry, Reviews in Mineralogy and Geochemistry, vol. 52 (eds. B. Bourdon, G. M. Henderson, C. C. Lundstrom and S. P Turner), pp. 215-253. The Mineralogical Society of America. Washington DC, USA.
16. Bourdon B., Henderson G.M., Lundstrom C.C., and Turner S.P. Uranium-series geochemistry. Rev. Min. Geochem. 52 (2003) 656
17. Bourdon B., Turner S.P., and Ribe N.M. Partial melting and upwelling rates beneath the Azores from a U-series isotope perspective. Earth Planet. Sci. Lett. 239 (2005) 42-56
18. Bourdon B., Ribe N.M., Stracke A., Saal A., and Turner S.P. Insights into the dynamics of mantle plumes from uranium-series geochemistry. Nature 444 (2006) 713-717
19. 226Ra disequilibria in volcanics - a new insight into melting conditions. Earth Planet. Sci. Lett. 126 (1994) 61-74
20. Chalot-Prat F., Ganne J., and Lombard A. No significant element transfer from the oceanic plate to the mantle wedge during subduction and exhumation of the Tethys lithosphere (Western Alps). Lithos 69 (2003) 69-103
21. Chase C.G. Ocean Island Pb: two-stage histories and mantle evolution. Earth Planet. Sci. Lett. 52 (1981) 277-284
22. Cheng H., Edwards R.L., Hoff J., Gallup C.D., Richards D.A., and Asmerom Y. The half lives of uranium-234 and thorium-230. Chem. Geol. 169 (2000) 17-33
23. 226Ra fractionation in historical lavas from the Azores: long-lived source heterogeneity vs. metasomatism fingerprints. Chem. Geol. 176 (2001) 295-310
24. Cohen A.S., and O'Nions R.K. Melting rates beneath Hawaii - evidence from uranium series isotopes in recent lavas. Earth Planet. Sci. Lett. 120 (1993) 169-175
25. 238U radioactive disequilibria in tholeiites from the FAMOUS zone (mid-Atlantic ridge, 36050′N) - Th and Sr isotope geochemistry. Earth Planet. Sci. Lett. 55 (1981) 247-256
26. 230Th disequilibria and mantle melting processes: a discussion. Chem. Geol. 162 (2000) 95-104
27. DePaolo D.J. Nd Isotope Geochemistry: An Introduction (1988), Springer-Verlag, New York
28. Elkins L.J., Gaetani G.A., and Sims K.W.W. Partitioning of U and Th during garnet pyroxenite partial melting: constraints on the source of alkaline ocean island basalts. Earth Planet. Sci. Lett. 265 (2008) 270-286
29. Elliott T. Fractionation of U and Th during mantle melting. Chem. Geol. 139 (1997) 165-183
30. Elliott T., and Spiegeleman M. Melt migration in oceanic crustal production: a U-series perspective. Treatise Geochem. 3 (2003) 465-510
31. Elliott T., Blichert-Toft J., Heumann A., Koetsier G., and Forjaz V. The origin of enriched mantle beneath São Miguel, Azores. Geochim. Cosmochim. Acta 71 (2007) 219-240
32. Escartin J., Cannat M., Pouliquen G., and Rabain A. Crustal thickness of V-shaped ridges south of the Azores: interaction of the mid-Atlantic ridge (36°-39°N) and the Azores hot spot. J. Geophys. Res. 106 (2001) 21719-21735
33. Faul U. Melt retention and segregation beneath mid-ocean ridges. Nature 410 (2001) 920-923
34. França Z.T.M., Tassinari C.C.G., Cruz J.V., Aparicio A.Y., Araña V., and Rodrigues B.N. Petrology, geochemistry and Sr-Nd-Pb isotopes of the volcanic rocks from Pico Island-Azores (Portugal). J. Volcanol. Geotherm. Res. 156 (2006) 71-89
35. Frey F.A., Green D.H., and Roy S.D. Integrated models of basalt petrogenesis: A study of quartz tholeiites to olivine melilitites from south eastern Australia utilizing geochemical and experimental petrological data. J. Petrol. 19 (1978) 463-513
36. Gast P.W. Trace element fractionation and the origin of tholeiitic and alkalic magma types. Geochim. Cosmochim. Acta 32 (1968) 1057-1086
37. Georgen J.E., and Lin J. Three-dimensional passive flow and temperature structure beneath oceanic ridge-ridge-ridge triple junctions. Earth Planet. Sci. Lett. 204 (2002) 115-132
38. Ghiorso M.S. Algorithms for the estimation of phase stability in heterogeneous thermodynamic systems. Geochim. Cosmochim. Acta 58 (1994) 5489-5501
39. Goldstein S.L., O'Nions R.K., and Hamilton P.J. Sm-Nd isotopic study of atmospheric dust and particulates from major river systems. Earth Planet. Sci. Lett. 70 (1984) 221-236
40. Green D.H., and Ringwood A.E. The genesis of basaltic magmas. Contrib. Mineral. Petrol. 15 (1967) 103-190
41. Green D.H., and Ringwood A.E. Genesis of the calc-alkaline igneous rock suite. Contrib. Mineral. Petrol. 18 (1968) 105-162
42. Haase K.M. The relationship between the age of the lithosphere and the composition of oceanic magmas: constraints on partial melting, mantle sources and the thermal structure of plates. Earth Planet. Sci. Lett. 144 (1996) 75-92
43. Hanson G.N. Evolution of the suboceanic mantle. J. Geol. Soc. Lond. 134 (1977) 235-253
44. Hart S.R., Hauri E.H., Oschmann L.A., and Whitehead J.A. Mantle plumes and entrainment - isotopic evidence. Science 256 (1992) 517-520
45. Hauri E.H. Major element variability in the Hawaiian mantle plume. Nature 382 (1996) 415-419
46. Hermann J., Spandler C.J., Hack A., and Korsakov A. Aqueous fluids and hydrous melts in high-pressure rocks: implications for element transfer in subduction zones. Lithos 92 (2006) 399-417
47. Herzberg C. Petrology and thermal structure of the Hawaiian plume from Mauna Kea volcano. Nature 444 (2006) 605-609
48. Hirschmann M.M. Mantle solidus: experimental constraints and the effect of peridotite composition. Geochem. Geophys. Geosyst. 1 (2000) doi:10.1029/2000GC000070
49. Hirschmann M.M., Stolper E.M., and Ghiorso M.S. Perspectives on shallow mantle melting from thermodynamic calculations. Mineral. Mag. A58 (1994) 418-419
50. Hirschmann M.M., and Stolper E.M. A possible role for garnet pyroxenite in the origin of the "garnet signature" in MORB. Contrib. Mineral. Petrol. 124 (1996) 185-208
51. Hirschmann M.M., Asimow P.D., Ghiorso M.S., and Stolper E.D. Calculation of peridotite partial melting from thermodynamic models of minerals and melts. III. Controls on isobaric melt production and the effect of water on melt production. J. Petrol. 40 (1999) 831-851
52. Hirschmann M.M., Kogiso T., Baker M.B., and Stolper E.M. Alkalic magmas generated by partial melting of garnet pyroxenite. Geology 31 (2003) 481-484
53. Hoffmann D., Prytulak J., Richards D., Elliott T., Coath C.D., Smart P.L., and Scholz D. Procedures for accurate U and Th isotope measurements by high precision MC-ICPMS. Int. J. Mass Spectrom. 264 (2007) 97-109
54. Hofmann A.W., and White W.M. Mantle plumes from ancient oceanic crust. Earth Planet. Sci. Lett. 57 (1982) 421-436
55. Holtzman B.K., Kohlstedt D.L., Zimmerman M.E., Heidelbach F., Hiraga T., and Hustoft J. Melt segregation and strain partitioning: implications for seismic anisotropy and mantle flow. Science 301 (2003) 1227-1230
56. Holtzman B.K., Kohlstedt D.L., and Phipps Morgan J. Viscous energy dissipation and strain partitioning in partially molten rocks. J. Pet. 46 (2005) 2569-2592
57. 231Pa disequilibria produced by mantle melting with porous flow and channel flows. Earth Planet. Sci. Lett. 125 (1994) 1-16
58. Jacobsen S.B., and Wasserburg G.J. Sm-Nd isotopic evolution of chondrites. Earth Planet. Sci. Lett. 50 (1980) 139-155
59. 238U. Phys. Rev. C4 (1971) 1889
60. Johnson K.T.M. Experimental cpx/and garnet/melt partitioning of REE and other trace elements at high pressures; petrogenetic implications. Mineral. Mag. 58 (1994) 454-455
61. Jull M., Kelemen P.B., and Sims K. Consequences of diffuse and channeled porous melt migration on uranium series disequilibria. Geochim. Cosmochim. Acta 66 (2002) 4133-4148
62. Kelemen P.B. Assimilation of ultramafic rock in subduction-related magmatic arcs. J. Geol. 94 (1986) 829-843
63. Kelemen P.B. Genesis of high Mg# andesites and the continental crust. Contrib. Mineral. Petrol. 120 (1995) 1-19
64. Kelemen P.B., Hart S.R., and Bernstein S. Silica enrichment in the continental upper mantle via melt/rock reaction. Earth Planet. Sci. Lett. 164 (1998) 387-406
65. Kelly K.A., Plank T., Ludden J., and Staudigel H. Composition of altered oceanic crust at ODP sites 801 and 1149. Geochem. Geophys. Geosyst. 4 (2003) 8910 10.1029/2002GC00435
66. Keshav S., Gudfinnsson G.H., Sen G., and Fei Y.-W. High-pressure melting experiments on garnet clinopyroxenite and the alkalic to tholeiitic transition in ocean-island basalts. Earth Planet. Sci. Lett. 223 (2004) 365-379
67. Klein E.M., and Langmuir C.H. Global correlations of ocean ridge basalt chemistry with axial depth and crustal thickness. J. Geophys. Res. 92 (1987) 8089-8115
68. Kogiso T., Hirschmann M.M., and Frost D.J. High-pressure partial melting of garnet pyroxenite: possible mafic lithologies in the source of ocean island basalts. Earth Planet. Sci. Lett. 216 (2003) 603-617
69. Kogiso T., Hirschmann M.M., and Pertermann M. High-pressure partial melting of mafic lithologies in the mantle. J. Petrol. 45 (2004) 2407-2422
70. Kogiso T., and Hirschmann M.M. Partial melting experiments of bimineralic eclogite and the role of recycled mafic oceanic crust in the genesis of ocean island basalts. Earth Planet. Sci. Lett. 249 (2006) 188-199
71. 230Th disequilibria in postglacial volcanic rocks. Earth Planet. Sci. Lett. 214 (2003) 167-186
72. La Tourette T.Z., Kennedy A.K., and Wasserburg G.J. Thorium-uranium fractionation by garnet: evidence for a deep source and rapid rise of oceanic basalts. Science 261 (1993) 739-742
73. Landwehr D., Blundy J., Chamorro-Perez E.M., Hill E., and Wood B.J. U-series disequilibria generated by partial melting of spinel lherzolite. Earth Planet. Sci. Lett. 188 (2001) 329-348
74. Langmuir C. H., Klein E. M. and Plank T. (1992) Petrological systematics of mid-ocean ridge basalts: constraint on melt generation beneath ocean ridges. In: Mantle Flow and Melt Generation Beneath Ocean Ridges (eds. J. Phipps Morgan et al.). Geophysical Monograph 71, pp. 183-280.
75. Le Bas M.J., Le Maitre R.W., Streckeisen A., and Zanettin B. A chemical classification of volcanic rocks based on total alkali-silica diagram. J. Petrol. 27 (1986) 745-750
76. Liu Y., Gao S., Kelemen P.B., and Xu W. Recycled crust controls contrasting source compositions of Mesozoic and Cenozoic basalts in the Northern China craton. Geochim. Cosmochim. Acta 72 (2008) 2349-2376
77. Lundstrom C.C., Gill J., Williams Q., and Perfit M. Mantle melting and basalt extraction by equilibrium porous flow. Science 270 (1995) 1958-1961
78. Lundstrom C.C., Gill J., Williams Q., and Hanan B.B. Investigating solid mantle upwelling beneath mid-ocean ridges using U-series disequilibria II: a local study at 330S Mid-Atlantic Ridge. Earth Planet. Sci. Lett. 157 (1998) 167-181
79. Lundstrom C.C., Sampson D.E., Perfit M.R., Gill J., and Williams Q. Insights into mid-ocean ridge basalt petrogenesis: U-series disequilibria from the Siqueiros Transform, Lamont Seamounts, and East Pacific Rise. J. Geophys. Res. 104 (1999) 13035-13048
80. Lundstrom C.C., Gill J., and Williams Q. A geochemically consistent hypothesis for MORB generation. Chem. Geol. 162 (2000) 105-126
81. Lundstrom C.C., Hoernle K., and Gill J. U-series disequilibria in volcanic rocks from the Canary Islands: plume versus lithospheric melting. Geochim. Cosmochim. Acta 67 (2003) 4153-4177
82. Lundstrom C. C. (2003) Uranium-series disequilibria in mid-ocean ridge basalts: observations and models of basalt genesis. In: Uranium-Series Geochemistry, Reviews in Mineralogy and Geochemistry, vol. 52 (eds. B. Bourdon, G. M. Henderson, C. C. Lundstrom and S. P. Turner), pp. 175-214.
83. McBirney A.R., and Gass I.G. Relations of oceanic volcanic rocks to mid-ocean rises and heat flow. Earth Planet. Sci. Lett. 2 (1967) 265-276
84. McKenzie D. The generation and compaction of partial melts. J. Petrol. 25 (1984) 713-765
85. 238U disequilibrium and the melting process beneath ridge axes. Earth Planet. Sci. Lett. 72 (1985) 149-157
86. McKenzie D. The extraction of magma from the crust and mantle. Earth Planet. Sci. Lett. 74 (1985) 81-91
87. McKenzie D., and Bickle M.J. The volume and composition of melt generated by extension of the lithosphere. J. Petrol. 29 (1988) 625-679
88. McKenzie D., and O'Nions R.K. The source regions of ocean island basalts. J. Petrol. 36 (1995) 133-159
89. Moreira M., Doucelance R., Kurz M.D., Dupré B., and Allègre C.J. Helium and lead geochemistry of the Azores Archipelgo. Earth Planet. Sci. Lett. 169 (1999) 189-205
90. Morgan J.W. Convection plumes in the lower mantle. Nature 230 (1971) 42-43
91. Niu Y., and Batiza R. An empirical method for calculating melt compositions produced beneath mid-ocean ridges: application to axis and off-axis (seamounts) melting. J. Geophys. Res. 96 (1991) 21753-21777
92. Niu Y. and O'Hara M. J. (2003) The origin of ocean island basalts (OIB): a new perspective from petrology, geochemistry and mineral physics considerations. J. Geophys. Res. 108. doi: 10.1029/2002JB002048.
93. a Assembleia Luso-Espanhola de Geodesia e Geofisica", Almeria, Spain (eds. J. M. G. Garcia-Garcia and M. D. R. Romacho). Universidad de Almeria and Instituto Geográfico Nacional. Electronic Version (ISBN: 84-95172-10-0), 6pp.
94. Nunes J.C., Camacho A., França Z., Montesinos F.G., Alves M., Vieira R., Velez E., and Ortiz E. Gravity anomalies and crustal signature of volcano-tectonic structures of Pico Island (Azores). J. Volcanol. Geotherm. Res. 156 (2006) 55-70
95. 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
96. Pertermann M., and Hirschmann M.M. Trace element partitioning between vacancy-rich eclogite clinopyroxene and silicate melt. Am. Mineral. 87 (2002) 1365-1376
97. Pertermann M., and Hirschmann M.M. Partial melting experiments on a MORB-like pyroxenite between 2 and 3 GPa: constraints on the presence of pyroxenite in basalt source regions from solidus location and melting rate. J. Geophys. Res. 108 (2003) 2125 10.1029/2000JB000118
98. Pertermann M., and Hirschmann M.M. Anhydrous partial melting experiments on MORB-like eclogite: phase relations, phase compositions and mineral-melt partitioning of major elements at 2-3 GPa. J. Petrol. 44 (2003) 2173-2201
99. Pertermann M., Hirschmann M. M., Hametner K., Gunther D. and Schmidt M. W. (2004) Experimental determination of trace element partitioning between garnet and silica-rich liquid during anhydrous partial melting of MORB-like eclogite. Geochem. Geophys. Geosyst. 5. doi: 10.1029/2003GC000638.
100. Phipps Morgan J., and Morgan W.J. Two-stage melting and the geochemical evolution of the mantle: a recipe for mantle plum-pudding. Earth Planet. Sci. Lett. 170 (1999) 215-239
101. Phipps Morgan J. (2001) Thermodynamics of pressure release melting of a veined plum pudding mantle. Geochem. Geophys. Geosyst. 2. doi:10.1029/2000GC000049.
102. 235U disequilibria in volcanic rocks. Earth Planet. Sci. Lett. 148 (1997) 259-271
103. 238U disequilibria of historical Kilauea lavas (1790-1982) and the dynamics of mantle melting within the Hawaiian plume. Earth Planet. Sci. Lett. 186 (2001) 15-31
104. 238U disequilibria of Pu'u 'O'o eruption lavas. Earth Planet. Sci. Lett. 244 (2006) 155-169
105. Pilet S., Hernandez J., Sylvester P., and Poujol M. The metasomatic alternative for ocean island basalt chemical heterogeneity. Earth Planet. Sci. Lett. 236 (2005) 148-166
106. Pilet S., Baker M.B., and Stolper E.M. Metasomatised lithosphere and the origin of alkaline lavas. Science 320 (2008) 916-919
107. 2 enrichment in ocean island basalts. Earth Planet. Sci. Lett. 263 (2007) 388-403
108. Prytulak J., Elliott T., Hoffmann D., and Coath C.D. Assessment of USGS BCR-2 as a reference material for silicate U-Pa disequilibria measurements. Geostand. Geoanal. Res. 32 (2008) 55-63
109. Regelous M., Hofmann A.W., Abouchami W., and Galer S.J.G. Geochemistry of lavas from the Emperor Seamounts and the geochemical evolution of Hawaiian magmatism from 85 to 42 Ma. J. Petrol. 44 (2003) 113-140
110. Regelous M., Turner S.P., Elliott T.R., Rostami K., and Hawkesworth C.J. Measurement of femtogram quantities of protactinium in silicate rock samples by multicollector inductively coupled plasma mass spectrometry. Anal. Chem. 76 (2004) 3584-3589
111. Ringwood A.E., and Green D.H. An experimental investigation of the gabbro-eclogite transition and some geophysical implications. Tectonophysics 3 (1966) 383-427
112. Robert J., Miranda C.F., and Muxart R. Mesure de la periode du protactinium-231 par microcalorimetrie. Radiochim. Acta 11 (1969) 104-108
113. Salters V.J.M., and Hart S.R. The hafnium paradox and the role of garnet in the source of mid-ocean-ridge basalts. Nature 342 (1989) 420-422
114. Salters V.J.M., and Longhi J. Trace element partitioning during the initial stages of melting beneath mid-ocean ridges. Earth Planet. Sci. Lett. 166 (1999) 15-30
115. Salters V. J. M., Longhi J. E. and Bizimis M. (2002) Near mantle solidus trace element partitioning at pressures up to 3.4 GPa. Geochem. Geophys. Geosyst. 3. doi:10.1029/2001GC000148.
116. Salters V. J. M. and Stracke A. (2004) Composition of the depleted mantle. Geochem. Geophys. Geosyst. 5. doi: 10.1029/2003GC000597.
117. 231Pa disequilibria. Geochim. Cosmochim. Acta 63 (1999) 4119-4138
118. Sims K.W.W., Goldstein S.J., Blichert-Toft J., Perfit M.R., Kelemen P., Fornari D.J., Michael P., Murrell M.T., Hart S.R., DePaolo D.J., Layne G., Ball L., Jull M., and Bender J. Chemical and isotopic constraints on the generation and transport of magma beneath the East Pacific Rise. Geochim. Cosmochim. Acta 66 (2002) 3481-3504
119. Sims K.W.W., Gill J., Dosseto A., Hoffmann D.L., Lundstrom C., Williams R., Ball L., Tollstrup D., Turner S., Prytulak J., Glessner J., Standish J., and Elliott T. An interlaboratory assessment of the Th isotopic composition of synthetic and rock standards. Geostand. Geoanal. Res. 32 (2008) 65-91
120. 231Pa constraints on the ages and petrogenesis of Vailulu'u and Malumalu lavas, Samoa. Geochem. Geophys. Geosyst. 9, Q04003. doi: 10.1029/2007GC001651.
121. Sleep N.H. Hotspots and mantle plumes: some phenomenology. J. Geophys. Res. 95 (1990) 6175-6736
122. Sobolev A.V., and Shimizi N. Ultra-depleted primary melt included in an olivine from the Mid-Atlantic ridge. Nature 363 (1993) 151-154
123. Sobolev A.V., Hofmann A.W., Sobolev S.V., and Nikogosian I.K. An olivine-free mantle source of Hawaiian shield basalts. Nature 434 (2005) 590-597
124. Sobolev A.V., Hofmann A.W., Kuzmin D.V., Yaxley G.M., Arndt N.T., Chung S.-L., Danyushevsky L.V., Elliott T., Frey F.A., Garcia M.O., et al. The amount of recycled crust in sources of mantle-derived melts. Science 316 (2007) 412-417
125. Spandler C.J., Hermann J., Arculus R.J., and Mavrogenes J.A. Geochemical heterogeneity and element mobility in deeply subducted oceanic crust; insights from high-pressure mafic rocks from New Caledonia. Chem. Geol. 206 (2004) 21-42
126. Spandler C., Yaxley G., Green D.H., and Rosenthal A. Phase relations and melting of anhydrous K-bearing eclogite from 1200 to 1600 °C and 3 to 5 GPa. J. Petrol. 49 (2008) 771-795
127. Spiegelman M. (2000) UserCalc: a web-based uranium series calculator for magma migration problems. Geochem. Geophys. Geosyst. 1. doi:10.1029/1999GC000030.
128. Spiegelman M., and Elliott T. Consequences of melt transport for uranium series disequilibrium in young lavas. Earth Planet. Sci. Lett. 118 (1993) 1-20
129. Stracke A., Salters V.J.M., and Sims K.W.W. Assessing the presence of garnet-pyroxenite in the mantle sources of basalts through combined hafnium-neodymium-thorium isotope systematics. Geochem. Geophys. Geosyst. 1 (1999) doi:10.1029/1999GC000013
130. Stracke A., Zindler A., Salters V. J. M., McKenzie D., Blichert-Toft J., Albarède F. and Grönvold K. (2003a) Theistareykir re-visited. Geochem. Geophys. Geosyst. 4, 8507. doi: 10.1029/2001GC000201.
131. Stracke A., Zindler A., Salters V. J. M., McKenzie D. and Gronvold K. (2003b) The dynamics of melting beneath Theistareykir, northern Iceland. Geochem. Geophys. Geosyst. 4, 8513. doi: 10.1029/2002GC000347.
132. Stracke A., Hofmann A.W., and Hart S.R. FOZO, HIMU, and the rest of the mantle zoo. Geochem. Geophys. Geosyst. 6 (2005) Q05007 10.1029/2004GC000824
133. Stracke A., Bourdon B., and McKenzie D. Melt extraction in the Earth's mantle: constraints from U-Th-Pa-Ra studies in oceanic basalts. Earth Planet. Sci. Lett. 244 (2006) 97-112
134. Stolper E., and Asimow P. Insights into mantle melting from graphical analysis of one-component systems. Am. J. Sci. 307 (2007) 1051-1139
135. Storey M., Wolff J.A., Norry M.J., and Marriner G.F. Origin of hybrid lavas from the Agua de Pau volcano, Sao Miguel, Azores. In: Saunders A.D., and Norry M.J. (Eds). Magmatism in the Ocean Basins (1989), Blackwell, London 161-180
136. Sun S.-S. and McDonough W. F. (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In Magmatism in the Oceanic Basins, vol. 42 (eds. A. D. Saunders and M. J. Norry). Geol. Soc. Spec. Publ., pp. 313-346.
137. Tuff J., Takahashi E., and Gibson S.A. Experimental constraints on the role of garnet pyroxenite in the genesis of high-Fe mantle plume derived melts. J. Petrol. 46 (2005) 2023-2058
138. Turner S., Hawkesworth C.J., Rogers N., and King P. U-Th isotope disequilibria and ocean island basalt generation in the Azores. Chem. Geol. 139 (1997) 145-164
139. 230Th evidence for multiple dehydration events, rapid melt ascent and the time scales of differentiation beneath the Tonga-Kermadec island arc. Earth Planet. Sci. Lett. 179 (2000) 581-593
140. Vance D., and Thirlwall M. An assessment of mass discrimination in MC-ICPMS using Nd isotopes. Chem. Geol. 185 (2002) 227-240
141. Vogt P.R., and Jung W.Y. The Terciera Rift as hyper-slow, hotspot-dominated oblique spreading axis: a comparison with other slow-spreading plate boundaries. Earth Planet. Sci. Lett. 218 (2004) 77-90
142. Walter M.J. Melting of garnet peridotite and the origin of komatiite and depleted lithosphere. J. Petrol. 39 (1998) 29-60
143. Wang Z., and Gaetani G.A. Partitioning of Ni between olivine and siliceous eclogite partial melt: experimental constraints on the mantle source of Hawaiian basalts. Contrib. Mineral. Petrol. 156 (2008) 661-678
144. Weaver B.L. The origin of ocean island basalt endmember compositions: trace element and isotopic constraints. Earth Planet. Sci. Lett. 104 (1991) 381-397
145. Willbold M. and Stracke A. (2006) Trace element composition of mantle end-members: implications for recycling of oceanic and upper and lower continental crust. Geochem. Geophys. Geosyst. 7. doi: 10.1029/2005GC001005.
146. Williams R.W., and Gill J.B. Effects of partial melting on the uranium decay series. Geochim. Cosmochim. Acta 53 (1989) 1607-1619
147. Williams R.W., Collerson K.D., Gill J.B., and Deniel C. High precision Th/U ratios in subcontinental lithospheric mantle: mass spectrometric measurement of Th isotopes in Gaussberg lamproites. Earth Planet. Sci. Lett. 111 (1992) 257-268
148. Williams R.W., and Gill J.B. Th isotope and U-series disequilibria in some alkali basalts. Geophys. Res. Lett. 19 (1992) 139-142
149. Wood D.A., Joron J.-L., Treuil M., Norry M., and Tarney J. Elemental and Sr isotope variation in basic lavas from Iceland and the surrounding ocean floor. Contrib. Mineral. Petrol. 70 (1979) 319-339
150. Wood B.J., Blundy J.D., and Robinson J.A.C. The role of clinopyroxene in generating U-series disequilibria during mantle melting. Geochim. Cosmochim. Acta 63 (1999) 1613-1620
151. Woodhall D. Geology and volcanic history of Pico Island, Azores. Nature 248 (1974) 663-665
152. Yasuda A., Fuijii T., and Kurita K. Melting and phase relations of an anhydrous mid-ocean ridge basalt from 3 to 20 GPa: implications for the behaviour of subducted oceanic crust in the mantle. J. Geophys. Res. 99 (1994) 9401-9414
153. Yaxley G.M., and Green D.H. Reactions between eclogite and peridotite: mantle refertilisation by subduction of oceanic crust. Schweiz. Mineral. Petrogr. Mitt. 78 (1998) 243-255
154. Yaxley G.M. Experimental study of the phase and melting relations of homogeneous basalt + peridotite mixtures and implications for the petrogenesis of flood basalts. Contrib. Mineral. Petrol. 139 (2000) 326-338
155. Yoder H.S., and Tilley C.E. Origin of basalt magmas: an experimental study of natural and synthetic rock systems. J. Petrol. 3 (1962) 342-532
156. 231Pa disequilibria in young lavas produced by mantle melting. Geochim. Cosmochim. Acta 64 (2000) 1809-1817