The influence of small-scale mantle heterogeneities on Mid-Ocean Ridge volcanism: Evidence from the southern Mid-Atlantic Ridge (7°30'S to 11°30'S) and Ascension Island

Earth and Planetary Science Letters

Volumn 296, Issue 3-4, 2010, Pages 299-310

  Paulick, H ^a   Munker C ^a,b,c   Schuth, S ^a,c  

^a UNIVERSITY OF BONN   (Germany)

^b UNIVERSITY OF COLOGNE   (Germany)

^c UNIVERSITY OF MÜNSTER   (Germany)

Author keywords

Ascension Island volcanism; Hf isotopes; Igneous geochemistry; Mantle convection; Mantle endmembers; Mantle plume; MORB

Indexed keywords

ASCENSION ISLAND VOLCANISM; ENDMEMBERS; HF ISOTOPE; MANTLE CONVECTION; MANTLE PLUME;

GALLIUM; GEOCHEMISTRY; GEOPHYSICS; HAFNIUM; IMAGE RESOLUTION; LEAD; MELTING; OCEAN CURRENTS; OSMIUM; SILICATE MINERALS; STRONTIUM; THERMAL PLUMES; TRACE ELEMENTS; VOLCANOES;

ISOTOPES;

FRACTURE ZONE; HETEROGENEITY; IGNEOUS GEOCHEMISTRY; ISOTOPIC ANALYSIS; ISOTOPIC COMPOSITION; MAGMA CHEMISTRY; MANTLE CHEMISTRY; MANTLE PROCESS; MID-OCEAN RIDGE; MID-OCEAN RIDGE BASALT; OCEANIC CRUST; PARTIAL MELTING; SPATIAL RESOLUTION; TOPOGRAPHIC EFFECT; TRACE ELEMENT; VOLCANISM;

ASCENSION ISLAND; ATLANTIC OCEAN; MID-ATLANTIC RIDGE;

EID: 77954658374     PISSN: 0012821X     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.epsl.2010.05.009     Document Type: Article

References (92)

1. Agranier A., Blichert-Toft J., Graham D.W., Debaille V., Schiano P., Albarède F. The spectra of isotopic heterogeneities along the Mid-Atlantic Ridge. Earth Planet. Sci. Lett. 2005, 238:96-109.
2. Albarède F., Télouk P., Blichert-Toft J., Boyet M., Agranier A., Nelson B. Precise and accurate isotopic measurements using multiple-collector ICPMS. Geochim. Cosmochim. Acta 2004, 68:2725-2744.
3. Allègre C.J., Hamelin B., Dupré B. Statistical analysis of isotopic ratios in MORB: the mantle blob cluster model and the convective regime of the mantle. Earth Planet. Sci. Lett. 1984, 71:71-84.
4. Allègre C.J., Turcotte D.L. Implications of a two component marble cake mantle. Nature 1986, 323:123-127.
5. 2O-bearing MORB: phase equilibria simulations of basalts at the MAR near Ascension Island (7°-11°S). J. Petrol. 2008, 49:25-45.
6. Andres M., Blichert-Toft J., Schilling J.-G. Hafnium isotopes in basalts from the southern Mid-Atlantic Ridge from 40°S to 55°S; Discovery and Shona plume-ridge interactions and the role of recycled sediments. Geochem. Geophys. Geosys. 2002, 3. 10.1029/2002GC000324.
7. Andres M., Blichert-Toft J., Schilling J.-G. Nature of the depleted upper mantle beneath the Atlantic: evidence from Hf isotopes in normal mid-ocean ridge basalts from 79°S to 55°S. Earth Planet. Sci. Lett. 2004, 225:98-103.
8. 204Pb double spike and thallium to correct for mass bias with a double-focusing MC-ICP-MS. Chem. Geol. 2004, 211:275-303.
9. Blichert-Toft J., Agranier A., Andres M., Kingsley R., Schilling J.-G., Albarède F. Geochemical segmentation of the Mid-Atlantic Ridge north of Iceland and ridge-hot spot interaction in the North Atlantic. Geochem. Geophys. Geosys. 2005, 6:Q01E19. 10.1029/2004GC000788.
10. Blichert-Toft J., Albarède F. The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system. Earth Planet. Sci. Lett. 1997, 148:243-258.
11. Bonatti E. Not so hot "hot spots" in the oceanic mantle. Science 1990, 250:107-111.
12. Bourdon E., Hémond C. Looking for the "missing endmember" in South Atlantic Ocean mantle around Ascension Island. Mineral. Petrol. 2001, 71:127-138.
13. Bouvier A., Vervoort J.D., Patchett P.J. The Lu-Hf and Sm-Nd isotopic composition of CHUR: constraints from unequilibrated chondrites and implications for the bulk composition of terrestrial planets. Earth Planet. Sci. Lett. 2008, 273:48-57.
14. Brozena J.M. Temporal and spatial variability of seafloor spreading processes in the northern South Atlantic. J. Geophys. Res. 1986, 91:497-510.
15. Brozena J.M., White R.S. Ridge jumps and propagations in the South Atlantic Ocean. Nature 1990, 348:149-152.
16. Bruguier N.J., Minshull T.A., Brozena J.M. Morphology and tectonics of the Mid-Atlantic Ridge, 7°-12° S. J. Geophys. Res. 2003, 108(B2):2093. 10.1029/2001JB001172.
17. Burke K.C., Wilson J.T. Hot spots on the Earth's surface. Sci. Am. 1976, 235:46-57.
18. Castillo P.R., Batiza R. Strontium, neodymium, and lead isotope constraints on near-ridge seamount production beneath the South Atlantic. Nature 1989, 342:262-265.
19. Chauvel C., Blichert-Toft J. A hafnium isotope and trace element perspective on melting of the depleted mantle. Earth Planet. Sci. Lett. 2001, 190:137-151.
20. Chauvel C., Lewin E., Carpentier M., Arndt N.T., Marini J.-C. Role of recycled oceanic basalt and sediment in generating the Hf-Nd mantle array. Nat. Geosci. 2008, 1:64-67.
21. Cohen R.S., Evensen N.M., Hamilton P.J., O'Nions R.K. U-Pb, Sm-Nd and Rb-Sr systematics of mid-ocean ridge basalt glasses. Nature 1980, 283:149-153.
22. Debaille V., Blichert-Toft J., Agranier A., Doucelance R., Schiano P., Albarède F. Geochemical component relationships in MORB from the Mid-Atlantic Ridge, 22-35°N. Earth Planet. Sci. Lett. 2006, 241:844-862.
23. Devey C.W. RV Sonne SO-84 Cruise report: The St Helena Hotspot. Berichte-Reports. Geologisch-Paläontologisches Institut der Universität Kiel 1993, Volume 64. and shipboard scientific party, Kiel, Germany.
24. Devey, C.W. and cruise participants, 1999. Report and shipboard results from METOR-cruise M41/2, Libreville - Victoria, 18.3. - 15.4. 1998. Berichte, Fachbereich Geowissenschaften, Universität Bremen, No. 137, Bremen, pp 50.
25. Donnelly K.E., Goldstein S.L., Langmuir C.-H., Spiegelman M. Origin of enriched ocean ridge basalts and implications for mantle dynamics. Earth Planet. Sci. Lett. 2004, 226:347-366.
26. Dosso L., Hanan B.B., Bougault H., Schilling J.-G., Joron J.-L. Sr-Nd-Pb geochemical morphology between 10° and 17°N on the Mid-Atlantic Ridge: a new MORB isotope signature. Earth Planet. Sci. Lett. 1991, 106:29-43.
27. Douglass J., Schilling J.G., Fontignie D. Plume-ridge interactions of the Discovery and Shona mantle plumes with the southern Mid-Atlantic Ridge (40 to 55°S). J. Geophys. Res. 1999, 104:2941-2962.
28. Dupré B., Allègre C.J. Pb-Sr isotopic variations in Indian Ocean basalts and mixing phenomena. Nature 1983, 303:142-146.
29. Evangelidis C.P., Minshull T.A., Henstock T.J. Three-dimensional crustal structure of Ascension Island from active source seismic tomography. Geophys. J. Int. 2004, 159:311-325.
30. Fontignie D., Schilling J.G. Mantle heterogeneities beneath the South Atlantic: a Nd-Sr-Pb isotope study along the Mid-Atlantic Ridge (3°S-46°S). Earth Planet. Sci. Lett. 1996, 142:209-221.
31. Garbe-Schönberg C.-D. Simultaneous determination of 37 trace elements in 28 international rock standards by ICP-MS. Geostand. Newsl. 1993, 17:81-93.
32. Graham D.W., Castillo P.R., Lupton J.E., Batiza R. Correlated He and Sr isotope ratios in south Atlantic near-ridge seamounts and implications for mantle dynamics. Earth Planet. Sci. Lett. 1996, 144:491-503.
33. Gurenko A.A., Chaussidon M. Enriched and depleted primitive melts included in olivine from Icelandic tholeiites: origin by continuous melting of a single mantle column. Geochim. Cosmochim. Acta 1995, 59:2905-2917.
34. Haase K., Devey C.W., Goldstein S.L. Two-way exchange between the Easter mantle plume and the Easter microplate spreading axis. Nature 1996, 382:344-346.
35. Hanan B.B., Kingsley R.H., Schilling J.-G. Pb isotope evidence in the South Atlantic for migrating ridge-hotspot interactions. Nature 1986, 322:137-144.
36. Hart S.R. A large-scale isotope anomaly in the Southern Hemisphere mantle. Nature 1984, 309:753-757.
37. Harris C. The petrology of lavas and associated plutonic inclusions of Ascension Island. J. Petrol. 1983, 24:424-470.
38. Harvey J., Gannoun A., Burton K.W., Rogers N.W., Alard O., Parkinson I.J. Ancient melt extraction from the oceanic upper mantle revealed by Re-Os isotopes in abyssal peridotites from the Mid-Atlantic Ridge. Earth Planet. Sci. Let. 2006, 244:606-621.
39. Hémond C., Hofmann A.W., Vlastélic I., Nauret F. Origin of MORB enrichment and relative trace element compatibilities along the Mid-Atlantic Ridge between 10° and 24°N. Geochem. Geophys. Geosys. 2006, 7. 2006GC001317.
40. Hirata T. Lead isotopic analyses of NIST standard reference materials using multiple collector inductively coupled plasma mass spectrometry coupled with a modified external correction method for mass discrimination effect. Analyst 1996, 121:1407-1411.
41. Hofmann A.W. Mantle geochemistry: the message from oceanic volcanism. Nature 1997, 385:219-229.
42. Hofmann A.W. Sampling mantle heterogeneity through ocean basalts: isotope and trace elements. The mantle and core 2003, 2:61-101. Elsevier, Amsterdam. N.D. Holland, K.K. Turekian (Eds.).
43. Humphris S.E., Thompson G., Schilling J.G., Kingsley R.H. Petrological and geochemical variations along the Mid-Atlantic Ridge between 46°S and 32°S: influence of the Tristan da Cunha mantle plume. Geochim. Cosmochim. Acta 1985, 49:1445-1464.
44. Ito E., White W.M., Goepel C. The O, Sr, Nd, and Pb isotope geochemistry of mid-ocean ridge basalts. Chem. Geol. 1987, 62:157-176.
45. Jacobsen S.B., Wasserburg G.J. Sm-Nd isotopic evolution of chondrites. Earth Planet. Sci. Lett. 1980, 50:139-155.
46. Kamenov G.D., Mueller P.A., Perfit M.R. Optimization of mixed Pb-Tl solutions for high precision isotopic analyses by MC-ICP-MS. J. Atom. Anal. Spec. 2004, 19:1262-1267.
47. Kar A., Weaver B., Davidson J., Colucci M. Origin of differentiated volcanic and plutonic rocks from Ascension Island, South Atlantic Ocean. J. Petrol. 1998, 39:1009-1024.
48. Klingelhöfer F., Minshull T.A., Blackman D.K., Harben P., Childers V. Crustal structure of Ascension Island from wide-angle seismic data: implications for the formation of near-ridge volcanic islands. Earth Planet. Sci. Lett. 2001, 190:41-56.
49. Kogiso T., Hirschmann M.M., Reiners W. Length scales of mantle heterogeneities and their relationship to ocean island basalt geochemistry. Geochim. Cosmochim. Acta 2004, 68:345-360.
50. Korkisch J., Hazan I. Anion exchange separations in hydrobromic acid-organic solvent media. Analyt. Chem. 1965, 37:707-710.
51. Le Roux, P.J., 2000. The geochemistry of selected mid-ocean ridge basalts from the southern Mid-Atlantic Ridge (40 to 55°S). PhD thesis, University of Cape Town, South Africa.
52. Ligi M., Bonatti E., Cipriani A., Ottolini L. Water-rich basalts at mid-ocean-ridge cold spots. Nature 2005, 434:66-69.
53. Liu C.-Z., Snow J.E., Hellebrand E., Brügmann G., v.d.Handt A., Büchl A., Hofmann A.W. Ancient, highly heterogeneous mantle beneath Gakkel ridge, Arctic Ocean. Nat. Geosci. 2008, 1:311-316.
54. McDonough W.F., Sun S.-S. The composition of the earth. Chem. Geol. 1995, 120:223-253.
55. Minshull T.A., Bruguier N.J., Brozena J.M. Ridge-plume interactions or mantle heterogeneity near Ascension Island?. Geology 1998, 26:115-118.
56. Möller, H., 2002. Magma genesis and mantle sources at the mid-atlantic ridge east of Ascension Island. PhD Thesis, Christian-Albrechts-Univeristät zu Kiel, Kiel, Germany. Electronic publications available from IFM GEOMAR Kiel library: http://eldiss.uni-kiel.de/macau/receive/dissertation_diss_597.
57. Montelli R., Nolet G., Dahlen F.A., Masters G. A catalogue of deep mantle plumes: new results from finite-frequency tomography. Geochem. Geophys. Geosyst. 2006, 7. /2006GC001248.
58. Morgan W.J. Hotspot tracks and the early rifting of the Atlantic. Tectonophysics 1983, 94:123-139.
59. Münker C., Weyer S., Scherer E., Mezger K. Separation of high field strength elements (Nb, Ta, Zr, Hf) and Lu from rock samples for MC-ICPMS measurements. Geochem. Geophys. Geosys. 2001, 2. 2001GC000183.
60. Nielson D.L. Introduction to geothermal exploration on Ascension Island, South Atlantic Ocean. Geothermics 1996, 25:419-425.
61. Nielson D.L., Sibbett B.S. Geology of Ascension Island, South Atlantic Ocean. Geothermics 1996, 25:427-448.
62. Nielson D.L., Stiger S.G. Drilling and evaluation of Ascension #1, a geothermal exploration well on Ascension Island, South Atlantic Ocean. Geothermics 1996, 25:543-560.
63. Niu Y., Batiza R. Magmatic processes at a slow spreading ridge segment: 26°S Mid-Atlantic Ridge. J. Geophys. Res. 1994, 99:19719-19740.
64. Niu Y., Waggoner J.M., Sinton J.M., Mahoney J.J. Mantle source heterogeneity and melting processes beneath seafloor spreading centers: the East Pacific Rise, 18°-19°S. J. Geophys. Res. 1996, 101:27711-27733.
65. O'Connor J.M., le Roex A.P. South Atlantic hot-spot-plume systems: 1. Distribution in time and space. Earth Planet. Sci. Lett. 1992, 113:343-364.
66. O'Connor J.M., Stoffers P., van den Bogaard P., McWilliams M. First seamount age evidence for significantly slower African plate motion since 19 to 30Ma. Earth Planet. Sci. Lett. 1999, 171:575-589.
67. Pearce J.A., Kempton P.D., Nowell G.M., Noble S.R. Hf-Nd element and isotope perspective on the nature and provenance of mantle and subduction components in Western Pacific arc-basin systems. J. Petrol. 1999, 40:1579-1611.
68. Prinzhofer A., Lewin E., Allègre C.J. Stochastic melting of the marble cake mantle: evidence from local study of the East Pacific Rise at 12°50'N. Earth Planet. Sci. Lett. 1989, 92:189-206.
69. Rampone E., Hofmann A.W., Raczek I. Isotopic equilibrium between mantle peridotite and melt: evidence from the Corsica ophiolite. Earth Planet. Sci. Lett. 2009, 288:601-610.
70. Regelous M., Niu Y., Abouchami W., Castillo P.R. Shallow origin for South Atlantic Dupal Anomaly from lower continental crust: geochemical evidence from the Mid-Atlantic Ridge at 26°S. Lithos 2009, 112:57-72.
71. Rehkämper M., Mezger K. Investigation of matrix effects for Pb isotope ratio measurements by multiple collector ICP-MS: verification and application of optimized analytical protocols. J. Anal. Atom. Spectrom. 2000, 15:1451-1460.
72. Rehkämper M., Halliday A.N. Accuracy and long-term reproducibility of lead isotopic measurements by multiple-collector inductively coupled plasma mass spectrometry using an external method for correction of mass discrimination. Int. J. Mass Spectrom. 1998, 181:123-133.
73. Salters V.J.M., Hart S.R. The mantle sources of ocean ridges, islands and arcs: the Hf isotope connection. Earth Planet. Sci. Lett. 1991, 104:364-380.
74. Salters V.J.M., Longhi J. Trace element partitioning during the initial stages of melting beneath mid-ocean ridges. Earth Planet. Sci. Let. 1999, 166:15-30.
75. Salters V.J.M., White W.M. Hf-isotope constraints on mantle evolution. Chem. Geol. 1998, 145:447-460.
76. Schiano P., Brick J.-L., Allègre C.J. Osmium-strontium-neodymium-lead isotopic co-variations in mid-ocean ridge basalt glasses and the heterogeneity of the upper mantle. Earth Planet. Sci. Lett. 1997, 150:363-379.
77. Schilling J.G. Iceland mantle plume: geochemical study of Reykjanes Ridge. Nature 1973, 242:565-571.
78. Schilling J.G. Upper mantle heterogeneities and dynamics. Nature 1985, 314:62-67.
79. Schilling J.-G., Thompson G., Kingsley R.H., Humphris S.E. Hotspot-migrating ridge interaction in the South Atlantic. Nature 1985, 313:187-191.
80. Schilling J.G., Hanan B.B., McCully B.L., Kingsley R.H., Fontignie D. Influence of the Sierra Leone mantle plume on the equatorial mid-atlantic ridge. J. Geophys. Res. 1994, 99:12005-12028.
81. Schilling J.G., Ruppel C., Davis A.N., McCully B.L., Tighe S.A., Kingsley R.H., Lin J. Thermal structure of the mantle beneath the equatorial Mid-Atlantic Ridge: inferences from the spatial variation of dredged basalt glass compositions. J. Geophys. Res. 1995, 100:10057-10076.
82. Schuth S., Münker C., Scherer E.E., König S. High-precision Pb isotope measurements discriminate different subduction components along the Solomon arc. Geochim. Cosmochim. Acta 2007, 71:A909.
83. Stracke A., Hofmann A.W., Hart S.R. FOZO, HIMU, and the rest of the mantle zoo. Geochem. Geophys. Geosys. 2005, 6:Q05007. 10.1029/2004GC000824.
84. Tackley P.J. Layer cake or plum pudding?. Nat. Geosci. 2008, 1:157-158.
85. van der Hilst R.D., de Hoop M.V. Reply to comment by R. Montelli, G. Nolet, F. A. Dahlen on "Banana-doughnut kernels and mantle tomography". Geophys. J. Int. 2006, 167:1211-1214.
86. Vervoort J.D., Blichert-Toft J. Evolution of the depleted mantle: Hf isotope evidence from juvenile rocks through time. Geochim. Cosmochim. Acta 1999, 63:533-556.
87. Vlastélic I., Bougault H., Dosso L. Heterogeneous heat production in the Earth's upper mantle: blob melting and MORB composition. Earth Planet. Sci. Lett. 2002, 199:157-172.
88. Weaver B., Kar A., Davidson J., Colucci M. Geochemical characteristics of volcanic rocks from Ascension Island, South Atlantic Ocean. Geothermics 1996, 25:449-470.
89. Weyer S., Münker C., Rehkämper M., Mezger K. Determination of ultra-low Nb, Ta, Zr and Hf concentrations and the chondritic Zr/Hf and Nb/Ta ratios by isotope dilution analyses with multiple collector ICP-MS. Chem. Geol. 2002, 187:295-313.
90. Weyer S., Münker C., Mezger K. Nb/Ta, Zr/Hf and REE in the depleted mantle: implications for the differentiation history of the crust-mantle system. Earth Planet. Sci. Lett. 2003, 205:309-324.
91. White W., Albarède F., Telouk P. High precision analysis of Pb isotope ratios by multi-collector ICPMS. Chem. Geol. 2000, 167:257-270.
92. Zindler A., Hart S.R. Chemical geodynamics. Annu. Rev. Earth Planet. Sci. 1986, 14:493-571.