Influence of spreading rate and magma supply on crystallization and assimilation beneath mid-ocean ridges: Evidence from chlorine and major element chemistry of mid-ocean ridge basalts

Journal of Geophysical Research: Solid Earth

Volumn 103, Issue 8, 1998, Pages 18325-18356

  Michael, Peter J ^a   Cornell, Winton C ^a  

^a UNIVERSITY OF TULSA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000118049     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: 10.1029/98jb00791     Document Type: Article

References (108)

1. Anderson-Fontana, S., J.F. Engeln, P. Lundgren, R.L. Larson and S. Stein, Tectonics and evolution of the Juan Fernandez microplate at the Pacific-Nazca-Antarctic triple junction, J. Geophys. Res., 91, 2005-2018, 1986.
2. Ariskin, A.A., G.S. Barmina and M. Y. Frenkel, Simulating low-pressure tholeiite-magma crystallization at fixed oxygen fugacity, Geochem. Int. ,24(5), 92-100, 1987.
3. Baker, E.T., Geological indexes of hydrothermal venting, J. Geophys. Res., 101, 13741-13753, 1996.
4. Baker, E.T., C.R. German and H. Elderfield, Hydrothermal plumes over spreading-center axes: Global distributions and geological inferences, in Seafloor Hydrothermal Systems: Physical, Chemical, Biological and Geological Interactions , Geophysical Monogr. Ser, vol 91, edited by S.E. Humphris et al., AGU, Washington, D.C. pp. 47-71, 1995.
5. Baker, E.T., Y.J. Chen, and J. Phipps Morgan, The relationship between near-axis hydrothermal cooling and the spreading rate of mid-ocean ridges, Earth Planet. Sci. Lett., 142, 137-145, 1996.
6. Botros, M., and H.P. Johnson, Tectonic evolution of the Explorer-northern Juan de Fuca region from 8 Ma to the present, J. Geophys. Res., 93, 10421-10437, 1988.
7. Bougault, H., L. Dmitriev, J.-G. Schilling, A. Sobolev, J.L. Joron, and H.D. Needham, Mantle heterogeneity from trace elements: MAR triple junction near 14°N, Earth Planet. Sci. Lett., 88, 27-36, 1988.
8. Braunmiller, J., J. Nabelek and B. Leitner, Seismotectonics of the Explorer Plate region (abstract), EoS Trans AGU, 77 (46), Fall Meet. Suppl., F655, 1996.
9. Bryan, W.B., Systematics of modal phenocryst assemblages in submarine basalts: Petrologic implications, Contrib. Mineral. Petrol., 83, 62-74, 1983.
10. Bryan, W.B., and J.G. Moore, Compositional variations of young basalts in the Mid-Atlantic Ridge rift valley near lat. 36°49′, Geol. Soc. Am. Bull., 88, 556-570, 1977.
11. Bryan, W.B., G. Thompson, and P.J. Michael, Compositional variation in a steady-state zoned magma chamber: Mid-Atlantic Ridge at 36°50′N, Tectonophysics, 55, 63-85, 1979.
12. Bryan, W.B., G. Thompson, and J.N. Ludden, Compositional variation in normal mid-ocean ridge basalt from 22°-25°N: Mid-Atlantic Ridge and Kane Fracture Zone, J. Geophys. Res., 86, 11815-11836, 1981.
13. Byers, C.D., D.W. Muenow, and M.O. Garcia, Volatiles in basalts and andesites from the Galapagos Spreading Center, 85°W to 86°W, Geochim. Cosmochim. Acta, 47, 1551-1558, 1983.
14. Byers, C.D., D.M. Christie, D.W. Muenow, and J.M. Sinton, Volatile contents and ferric-ferrous ratios of basalt, ferrobasalt, andesite and rhyodacite glasses from the Galapagos 95.5°W propagating rift, Geochim. Cosmochim. Acta, 48, 2239-2245, 1984.
15. Cannat, M., How thick is the magmatic crust at slow spreading oceanic ridges, J. Geophys. Res., 101, 2847-2857, 1996.
16. Carbotte, S., C. Mutter, J. Mutter, M. Spiegelman, G. Correa, M. McNutt, V. Bhat, and R. Cruz-Orozco, Influence of Spreading rate and magma supply on crustal magma bodies: Results from a recent seismic study of the shallow East Pacific Rise north of the Orozco Transform Fault, in: Ridge Events Newsletter, vol. 7, #1, 1996.
17. Chen, Y.J., The effects of mantle temperature and hydrothermal cooling on crustal accretion and axial topography at the hotspot-influenced Reykjanes Ridge (abstract), EoS Trans AGU, 78(46), Fall Meet. Suppl., F657, 1997.
18. Chen, Y.J., and W.J. Morgan, A nonlinear rheology model for mid-ocean ridge axis topography, J. Geophys. Res. 95, 17583-17604, 1990.
19. Chen, Y.J., and J. Phipps Morgan, The effects of spreading rate, the magma budget and the geometry of emplacement on the axial heat flux at mid-ocean riges, J. Geophys. Res., 101, 11,475-11,482, 1996.
20. 2O content of MORB glasses: Calibration of an empirical technique, Mineral. Petrol., 57, 185-204, 1996.
21. DeMets, C., R.G. Gordon, D.F. Argus, and S. Stein, Current plate motions, Geophys. J. Int., 101, 425-478, 1990.
22. DePaolo, D.J., Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization, Earth Planet. Sci. Lett., 53, 189-202, 1981.
23. Detrick, R.S., P. Buhl, E.E. Vera, J.C. Mutter, J.A. Orcutt, J.A. Madsen, and T.M. Brocher, Multichannel seismic imaging of a crustal magma chamber along the East pacific Rise, Nature, 326, 35-41, 1987.
24. Detrick, R.S., A.J. Harding, G.M. Kent, J.A. Orcutt, J.C. Mutter, and P. Buhl, Seismic structure of the southern East Pacific Rise, Science, 259, 499-503, 1993.
25. Devey, C.W., C.-D. Garbe-Schönberg, P. Stoffers, C. Chauvel, and D.F. Mertz, Geochemical effects of dynamic melting beneath ridges: Reconciling major and trace element variations in Kolbeinsey (and global) mid-ocean ridge basalt, J. Geophys. Res., 99, 9077-9095, 1994.
26. Dick, H.J.B., and J.H. Natland, Late-stage melt evolution and transport in the shallow mantle beneath the East Pacific Rise, Proc. Ocean Drill. Program, Sci. Results., 147, 103-134, 1996.
27. Dosso, L., H. Bougault, P. Beuzart, J.-Y. Calvez and J.-L. Joron, The geochemical structure of the South-East Indian Ridge, Earth Planet. Sci. Lett. 88, 47-59, 1988.
28. Dosso, L., H. Bougault, and J.-L. Joron, Geochemical morphology of the north Mid-Atlantic Ridge, 10°-24°N: Trace element-isotope complementarity. Earth Planet. Sci. Lett. 120, 443-462, 1995.
29. Elthon, D., D.K. Ross, and J.K. Meen, Compositional variation of basaltic glasses from the Mid-Cayman Rise spreading center, J. Geophys. Res., 100, 12,497-12,512, 1995.
30. Embley, R.W., I.R. Jonasson, M.R. Perfit, J.M. Franklin, M.A. Tivey, A. Malahoff, M.F. Smith and T.J.G. Francis, Submersible investigation of an extinct hydrothermal system on the Galapagos Ridge: Sulfide mound, stockwork zone, and differentiated lavas, Can. Mineral., 26, 517-539, 1988.
31. Fisk, M.R., J.-G. Schilling, and H. Sigurdsson, An experimental investigation of Iceland and Reykjanes Ridge tholeiites, I, Phase relations, Contrib. Mineral. Petrol., 74, 361-374, 1980.
32. Fisk, M.R., A.E. Bence, and J.-G. Schilling, Major element chemistry of Galapagos rift zone magmas and their phenocrysts, Earth Planet. Sci. Lett., 61, 171-189, 1982.
33. Flower, M.J., Thermal and kinematic control on ocean-ridge magma fractionation: contrasts between Atlantic and Pacific spreading axes, J. Geol. Soc. London, 138, 695-712, 1980.
34. 2+ between olivine and melt, J. Petrol., 24, 256-265, 1983.
35. Fowler, C.M.R., The Mid-Atlantic Ridge: Structure at 45°N, Geophys. J. R. Astron. Soc., 54, 167-183, 1978.
36. Frey, F.A., N. Walker, D. Stakes, S.R. Hart, and R. Nielsen, Geochemical characteristics of basaltic glasses from the AMAR and FAMOUS axial valleys, Mid-Atlantic Ridge (36°-37°N): Petrogenetic implications, Earth Planet. Sci. Lett., 115, 117-136, 1993.
37. Graham, D.W., D.M. Christie, K.S. Harpp, and J.E. Lupton, Mantle plume helium in submarine basalts from the Galápagos Platform, Science, 262, 2023-2026, 1993.
38. Gregory R.T., and H.P. Taylor, An oxygen isotope profile in a section of Cretaceous oceanic crust, Samail ophiolite, Oman: Evidence for ∂18O buffering of the oceans by deep (>5 km) seawater-hydrothermal circulation at mid-ocean riges, J. Geophys. Res., 86, 2737-2755, 1981.
39. Grove, T.L. and W.B. Bryan, Fractionation of pyroxene phyric MORB at low pressure: An experimental study, Contrib. Mineral. Petrol. 84, 293-309, 1983.
40. Grove, T.L., R.J. Kinzler, and W.B. Bryan, Fractionation of mid-ocean ridge basalt (MORB), in Mantle Flow and Melt Generation at Mid-ocean Ridges, Geophys Monograph Ser., vol. 71, edited by J. Phipps Morgan, D.K. Blackman, and J.M. Sinton, pp. 281-310, AGU, Washington, D.C., 1992.
41. Haymon, R.M., D.J. Fornari, M.H. Edwards, S. Carbotte, D. Wright and K.C. Macdonald, Hydrothermal vent distribution along the East Pacific Rise crest (9°09′-54′) and its relationship to magmatic and tectonic processes on fast spreading mid-ocean ridges, Earth Planet. Sci. Lett., 104, 513-534, 1991.
42. Hooft, E.E.E., R.S. Detrick, and G.M. Kent, Sesimic structure and indicators of magma budget along the Southern East Pacific Rise, J. Geophys. Res., 102, 27319-27340, 1997.
43. Huang, P.Y., and S.C. Solomon, Centroid depths of mid-ocean ridge earthquakes, J. Geophys. Res., 93, 13445-13477, 1988.
44. Humphris, S.E., G. Thompson, J.-G. Schilling, and R.H. Kingsley, Petrological and geochemical variations along the Mid-Atlantic Ridge between 46°S and 32°S: Influence of the Tristan da Cuhna mantle plume, Geochim. Cosmochim. Acta, 49, 1445-1464, 1985.
45. Jambon, A., B. Déruelle, G. Dreibus, and F. Pineau, Chlorine and bromine abundance in MORB: The contrasting behaviour of the Mid-Atlantic Ridge and East Pacific Rise and implications for chlorine geodynamic cycle, Chem. Geol., 126, 101-117, 1995.
46. Juster, T.C., T.L. Grove and M.R. Perfit, Experimental constraints on the generation of FeTi basalts, andesites and rhyodacites at the Galapagos Spreading Center, 85°W and 950W, J. Geohys. Res., 94, 9251-9274, 1989.
47. Klein, E.M., and C.H. Langmuir, Global correlations of ocean ridge basalt chemistry with axial depth and crustal thickness, J. Geophys. Res., 92, 8089-8115, 1987.
48. Kurz, M.D., Helium isotope geochemistry of oceanic volcanic rocks: Implications for mantle heterogeneity and degassing, Ph.D. thesis, Woods Hole Oceanogr. Inst./Mass. Inst. Technol., Cambridge, Mass., 1982.
49. Kurz, M.D., W.J. Jenkins, S.R. Hart, and D. Clague, Helium isotope variations in volcanic rocks from Loihi Seamount and the Island of Hawaii, Earth Planet. Sci. Lett., 66, 388-406, 1983.
50. Lalou, C., J.-L. Reyss, E. Brichet, P.A. Rona, and G. Thompson, Hydrothermal activity on a 105-year scale at a slow spreading ridge, TAG hydrothermal field, Mid-Atlantic Ridge 26°N, J.. Geophys. Res., 100, 17,855-17,862, 1995.
51. Langmuir, C.H., Geochemical consequences of in situ crystallization, Nature, 340, 199-205, 1989.
52. Langmuir, C.H., and J.F. Bender, The geochemistry of oceanic basalts in the vicinity of transform faults: observations and implications, Earth Planet. Sci. Lett., 69, 107-127, 1984.
53. Langmuir, C.H., E.M. Klein, and T. Plank, Petrological systematics of mid-ocean ridge basalts: Constraints on melt generation beneath ocean ridges, in Mantle Flow and Melt Generation at Mid-ocean Ridges, Geophys Monograph Ser., vol. 71, edited by J. Phipps Morgan, D.K. Blackman, and J.M. Sinton, pp. 183-280, AGU, Washington, D.C., 1992.
54. le Roex, A.P., H.J.B. Dick, A.J. Erlank, A.M. Reid, F.A. Frey, and S.R. Hart, Geochemistry, mineralogy and petrogenesis of lavas erupted along the Southwest Indian Ridge between the Bouvet Triple Junction and 11 degrees east, J. Petrol., 24, 267-318, 1983.
55. le Roex, A.P., H.J.B. Dick, A.M. Reid, F.A. Frey, A.J. Erlank, and S.R. Hart, Petrology and geochemistry of basalts from the American-Antarctic Ridge, Southern Ocean: Implications for the westward influence of the Bouvet mantle plume, Contrib. Mineral. Petrol., 90, 367-380, 1985.
56. le Roex, A.P., F.A. Frey, and S.H. Richardson, Petrogenesis of lavas from the AMAR valley and Narrowgate region of the FAMOUS valley, 36°-37°N on the Mid-Atlantic Ridge, Contrib. Mineral. Petrol., 124, 167-184, 1996.
57. Magenheim, A.J., A.J. Spivack, P.J. Michael, and J.M. Gieskes, Chlorine stable isotope composition of the oceanic crust: Implications for Earth's distribution of chlorine. Earth Planet. Sci. Lett., 131, 427-432, 1995.
58. Melson, W.G., G.R. Byerly, J.A. Nelen, T. O'Hearn, T.L. Wright, and T. Vallier, A catalog of the major element chemistry of abyssal volcanic glasses, Smithson. Contrib. Earth Sci., 19, 31-60, 1977.
59. Meyer, P.S., and W.B. Bryan, Petrology of basaltic glasses from the TAG segment: Implications for a deep hydrothermal heat source, Geophys. Res. Lett., 23, 3435-3438, 1996.
60. 2O, Earth Planet. Sci. Lett., 131, 301-320, 1995.
61. 2O and pressure on mid-ocean ridge basalt differentiation, Contrib. Mineral. Petrol.,96, 245-263, 1987.
62. Michael, P.J., and W.C. Cornell, Cl in MORB: Evidence for a spreading rae dependence on assimilation in magma chambers, paper presented at V.M. Goldschmidt Conference for Geochemistry,Geochemical Society, Edinburgh, Scotland, 1992.
63. Michael, P.J., and J.-G. Schilling, Chlorine in mid-ocean ridge magmas: Evidence for assimilation of seawater-influenced components, Geochim. Cosmochim. Acta, 53, 3131-3143, 1989.
64. Michael, P.J., R.L. Chase, and J.F. Allan, Petrologic and geologic variations along the southern Explorer Ridge, northeast Pacific Ocean, J. Geophys. Res. 94., 13895-13918, 1989.
65. Michael, P.J., D.W. Forsyth, D.K. Blackman, P.J. Fox, B.B. Hanan, A.J. Harding, K.C. Macdonald, G.F. Neumann, J.A. Orcutt, M. Tolstoy, and C.M. Weiland, Mantle control of a dynamically evolving spreading center: Mid-Atlantic Ridge 31-34°S, Earth Planet. Sci. Lett., 121, 451-468, 1994.
66. Natland, J.H., and H.J.B. Dick, Melt migration through high-level gabbroic cumulates of the East Pacific Rise at Hess Deep: The origin of magma lenses and the deep crustal structure of fast spreading ridges, Proc. Ocean Drill. Program Sci. Results., 147, 21-58, 1996.
67. Neumann, G.A., and D.F. Forsyth, The paradox of the axial profile: Isostatic compensation along the axis of the Mid-Atlantic Ridge?, J. Geophys. Res., 98, 17891-17910, 1993.
68. Neumann, E.-R., and J.-G. Schilling, Petrology of basalts from the Mohns-Knipovich Ridge: The Norwegian-Greenland Sea, Contrib. Mineral. Petrol. 85, 209-223, 1984.
69. Niu, Y., and R. Batiza, Chemical variation trends at fast and slow spreading mid-ocean ridges, J. Geophys. Res., 98, 7887-7902, 1993.
70. Perfit, M.R., D.J. Fornari, M.C. Smith, J.F. Bender, C.H. Langmuir, and R.M. Haymon, Small-scale spatial and temporal variations in ridge crest magmatic processes, Geology 22, 375-379, 1994.
71. Perfit, M.R., W.I. Ridley, and I.R. Jonasson, Geologic, petrologic and geochemical relationships between magmatism amd massive sulfide mineralization along the Eastern Galapagos Spreading Center, in Reviews in Economic Geology -Volcanic-Associated Massive Sulfide Deposits, edited by T. Barry and M. Hannington, Soc. of Econ. Geol., New Haven, Conn., in press, 1998.
72. Phipps Morgan, J., and Y.J. Chen, The genesis of oceanic crust: Magma injection, hydrothermal circulation and crustal flow, J. Geophys. Res., 98, 6283-6297, 1993.
73. Phipps Morgan, J., A. Harding, J. Orcutt, G. Kent, and Y.J. Kent, An observational and theoretical synthesis of the magma chamber geometry and crustal genesis along a mid-ocean ridge spreading center, in Magmatic Systems, edited by M. Ryan, pp. 139-178 Academic, San Diego, Calif., 1994.
74. Poreda, R., J.-G. Schilling and H. Craig, Helium and hydrogen isotopes in ocean ridge basalts north and south of Iceland, Earth Planet. Sci. Lett., 78, 1-17, 1986.
75. Purdy, G.M., and R.S. Derrick, Crustal structure of the Mid-Atlantic Ridge at 23°N from seismic refreaction studies, J. Geophys. Res., 91, 3739-376, 1986.
76. Purdy, G. M., L.S.L. Kong, G.L. Christeson, and S.C. Solomon, Relationship between spreading rate and the seismic structure of mid-ocean ridges, Nature, 355, 815-817, 1992.
77. Pyle, D.G., Geochemistry of basalt within and surrounding the Australian-Antarctic Discordance, Ph.D. thesis, Oregon State Univ., Corvallis, 1994.
78. Reynolds, J.R., Segment-scale systematics of mid-ocean ridge magmatism and geochemistry, Ph.D. thesis, 483 pp., Columbia Univ., New York, 1995.
79. Reynolds, J.R., and C.H. Langmuir, Petrological systematics of the Mid-Atlantic Ridge south of Kane: Implications for ocean crust formation, J. Geophys. Res., 102, 14915-14946, 1997.
80. Riddihough, R.P., Recent movements of the Juan de Fuca plate system, J. Geophys. Res., 89, 6980-6994, 1984.
81. Rona, P.A., G. Thompson, M.J. Mottl, J.A. Karson, W.J. Jenkins, D. Graham, M. Malette, K. Von Damm, and J.M. Edmond, Hydrothermal activity at the TAG hydrothermal field, Mid-Atlantic Ridge crest at 26°N, J. Geophys. Res., 89, 11365-11377, 1984.
82. Rowe, E.C., and and J.-G. Schilling, Fluorine in Iceland and Reykjanes Ridge basalts, Nature, 279, 33-37, 1979.
83. Scheirer, D.S., and K.C. Macdonald, Variation in cross-sectional area of the axial ridge along the East Pacific Rise: Evidence for the magmatic budget of a fast spreading center, J. Geophys. Res., 98, 7871-7885, 1993.
84. Schilling, J.-G., M.B. Bergeron, and R. Evans, Halogens in the mantle beneath the North Atlantic, Philos. Trans. R. Soc. London, Ser. A, 297, 147-178, 1980.
85. Schilling, J.-G., M. Zajac, R. Evans, T. Johnston, W. White, J.D. Devine, and R. Kingsley, Petrologic and geochemical variations along the Mid-Atlantic Ridge from 29°N to 73°N, Am. J. Sci., 283, 510-586, 1983.
86. Scott, S.D., R.L. Chase, M. Hannington, P.J. Michael, T.M. McConachy, and G.T. Shea, Sulfide deposits,tectonics and petrogenesis of Explorer Ridge, northeast Pacific Ocean. in Oceanic Crustal Analogues, Proceedings of the Symposium "Troodos 87", edited by J. Malpas et al., Geol. Surv. Dep., Minist. of Agric. and Nat. Resourc., Nicosia, pp. 719-733, 1990.
87. Shen, Y., and D.W. Forsyth, Geochemical constraints on initial and final depths of melting beneath mid-ocean ridges, J. Geophys. Res., 100, 2211-2237, 1995.
88. 2, Contrib. Mineral. Petrol., 110, 139-153, 1992.
89. Sigurdsson, H., First-order major element variation in basalt glasses from the Mid-Atlantic Ridge: 29°N to 73°N, J. Geophys. Res., 86, 9483-9502, 1981.
90. Sinha, M.C., D.A. Navin, L.M. MacGregor, S. Cohstable, C. Peirce, A. White, G. Heinson, and M.A. Inglis, Evidence for accumulated melt beneath the slow spreading Mid-Atlantic Ridge, Philos. Trans. R. Soc. London, Ser. A, 355, 233-253, 1997.
91. Sinton, J.M., and R.S. Detrick, Mid-ocean ridge magma chambers, J. Geophys. Res, 97, 197-216, 1992.
92. Stakes, D.S., J.W. Shervais, and C.A. Hopson, The volcanic-tectonic cycle of the FAMOUS and AMAR valleys, Mid-Atlantic Ridge (36°47′N): Evidence from basalt glass and phenocryst compositinal variations for a steady state magma chamber beneath valley midsections, J. Geophys. Res., 89, 6995-7028, 1984.
93. Thompson, G., W.B. Bryan, and W.G. Melson, Geological and geophysical investigation of the mid-Cayman Rise spreading center Geochemical variation and petrogenesis of basalt glasses, J. Geol., 88, 41-55, 1980.
94. Thompson, G., W.B. Bryan, R.D. Ballard, K. Hamuro, and W.G. Melson, Axial processes along a segment of the East Pacific Rise: 10°-12°N, Nature, 318, 429-433, 1985.
95. Thompson, G., W.B. Bryan, and S.E. Humphris, Axial volcanism on the East Pacific Rise, 10°-12°N, in Magmatism in the Ocean Basin, edited by A.D. Saunders and M.J. Norry, Geol. Soc. Spec. Publ. London, 42, 181-200, 1989.
96. Tolstoy, M., A.J. Harding, J.A. Orcutt, and J. Phipps Morgan, Crustal thickness at the Australian Antarctic Discordance and neighboring South East Indian Ridge, EoS Trans AGU, 76 (46), Fall Meet. Suppl., F570, 1996.
97. Toomey, D.R., S.C. Solomon, G.M. Purdy and M.H. Murray, Microearthquakes beneath the median valley of the Mid-Atlantic Ridge near 23°N: Hypocenters and focal mechanisms, J. Geophys. Res., 90, 5443-5458, 1985.
98. Toomey, D.R., S.C. Solomon, and G.M. Purdy, Microearthquakes beneath the median valley of the Mid-Atlantic Ridge near 23°N: Tomography and tectonics, J. Geophys. Res., 93, 9093-9112, 1988.
99. Tormey, D.R., T.L. Grove, and W.B. Bryan, Experimental petrology of normal MORB near the Kane Fracture Zone: 22°-25°N, Mid-Atlantic Ridge, Contrib. Mineral. Petrol., 96, 121-139, 1987.
100. Unni, C.K., and J.-G. Schilling, Cl and Br degassing by volcanism along the Reykjanes Ridge and Iceland, Nature, 272, 19-23, 1978.
101. Walker, D.A., T. Shibata, and S.E. DeLong, Abyssal tholeiites from the Oceanographer Fracture Zone, II, Phase equilibria and mixing, Contrib. Mineral. Petrol., 70, 111-125, 1979.
102. Weaver, B.L., Trace element evidence for the origin of ocean-island basalts, Geology, 19, 123-126, 1991.
103. Weaver, J.S., and C. Langmuir, Calculation of phase equilibrium in mineral-melt systems, Comput. Geosci., 16, 1-19, 1990.
104. White, W.M., Sources of oceanic basalts: Radiogenic isotope evidence, Geology, 13, 115-118, 1985.
105. White, W.M., and J.-G. Schilling, The nature and origin of geochemical variation in Mid-Atlantic Ridge basalts from the central North Atlantic, Geochim. Cosmochim. Acta, 42, 1501-1516, 1980.
106. Yang, H.-J., R.L. Kinzler, and T.L. Grove Experiments and models of anhydrous, basaltic olivine-plagioclase-augite saturated melts from 0.001 to 10 kbar Contrib. Mineral. Petrol., 124, 1-18, 1996.
107. Yelles-Chaouche, A., J. Francheteau, and P. Patriat, Evolution of the Juan Fernandez microplate during the last three million years, Earth Planet. Sci. Lett., 86, 269-286, 1987.
108. Zindler, A., and S.R. Hart, Chemical geodynamics, Annu. Rev. Earth Planet. Sci., 14, 493-571, 1986.