Geophysical and geochemical evidence for cold upper mantle beneath the Equatorial Atlantic Ocean

Revista Brasileira de Geofisica

Volumn 26, Issue 1, 2008, Pages 69-86

  Sichel, Susanna Eleonora ^a   Esperança, Sonia ^b   Motoki, Akihisa ^c   Maia, Mareia ^d   Horan, Mary F ^e   Szatmari, Peter ^f   Da Costa Alves, Eliane ^a   Mello, Sidney L M ^a  

^a FLUMINENSE FEDERAL UNIVERSITY   (Brazil)

^b USA   (United States)

^c STATE UNIVERSITY OF RIO DE JANEIRO   (Brazil)

^d CNRS   (France)

^e DTM   (United States)

^f PETROBRAS   (Brazil)

Author keywords

Abyssal mantle; Cold mantle; Equatorial Atlantic Ocean; Fossil subducted slab; Re Os isotope system; Saint Paul Fracture Zone

Indexed keywords

BASALT; FRACTURE ZONE; GEOCHEMISTRY; GEOPHYSICS; ISOTOPIC COMPOSITION; PERIDOTITE; RECONSTRUCTION; RHENIUM-OSMIUM DATING; SEAFLOOR; SUBDUCTION; TOMOGRAPHY; UPPER MANTLE;

INDIAN OCEAN; INDIAN OCEAN (EQUATORIAL);

EID: 46049098581     PISSN: 0102261X     EISSN: None     Source Type: Journal    
DOI: 10.1590/S0102-261X2008000100006     Document Type: Article

References (49)

1. BECKER TW & BOSCHI L. 2002. A comparison of tomographic and geodynamic mantle models. Geochem. Geophys. Geosyst., 3(1): 1003, doi:10.1029/2001GC000168.
2. BLAKEY R. 2004. Paleogeography. Available at: 〈;http://jan.ucc.nau. edu/~rcb7〉. Access on: December 15, 2007.
3. BONATTIE. 1990. Subcontinental mantle exposed in the Atlantic Ocean on St. Peter-Paul islets. Nature, 345(6278): 800-802.
4. BONATTIE & HONNOREZ J. 1970. Equatorial Mid-Atlantic Ridge: Petrologic and Sr isotopic evidence for an Alpine-Type Rock Assemblage. Earth and Planetary Letters, 9: 247-256.
5. BONATTI E, SEYLER M & SUSHEVSKAYA N. 1993. A Cold Suboceanic mantle belt at the Earth's Equator. Science, 261: 315-320.
6. BOSCHI L & DZIEWONSKI AM. 1999. High- and low-resolution images of the Earth's mantle - Implications of different approaches to tomographic modeling. J. Geophys. Res., 104(B11): 25, 567-25, 594.
7. BRANDON AD, CREASER RA, SHIREY SB & CARLSON RW. 1996. Osmium recycling in subduction zones. Science, 272:861-864.
8. 187Os systematics of abyssal peridotites. Earth Planet. Sci. Lett. 177:319-335.
9. CARLSON RW, PEARSON DG, BOYD FR, SHIREY SB, IRVINE G, MENZIES AH & GURNEY JJ. 1999. Re-Os systematics of lithospheric peridotites: Implications for lithosphere formation and preservation. In: GURNEY JJ, GURNEY JL, PASCOE MD & RICHARDSON SH (Ed.). Proceedings of the 7lh International Kimberlite Conference. Red Roof Design C.C. Cape Town, South Africa. 99-107.
10. CHRISTIE DM, WEST BP, PYLE DG & HANAN BB. 1998. Chaotic topography, mantle flow and mantle migration in the Australian-Antarctic discordance. Nature, 394:637-644.
11. COTTEN J, LE DEZ A, BAU M, CAROFF M. MAURY RC, DULSKIP, FOUR-CADE S, BOHN M, & BROUSSE R. 1995. Origin of anomalous rare-earth element and yttrium enrichments in subaerially exposed basalts: Evidence from French Polynesia. Chemical Geology, 119(1-4): 115-138.
12. CRAWFORD AJ, FALLONT J & GREEN DH. 1989. Classification and tectonic settings of boninites. In: CRAWFORD AJ (Ed.). Boninites and related rocks. Unwin Hyman Ltd. London, UK, 1-49.
13. DALZIELIW. 1997. Neoproterozoic-Paleozoic geography and tectonics: review, hypothesis, environmental speculation. Geological Society of America Bulletin, 109(1): 16-42.
14. FOX PJ & GALLO DG. 1984. A tectonic model for ridge-transform-ridge plate boundaries: implications for the structure of oceanic lithosphere. Tectonophysics, 104(3-4): 205-242.
15. FUKAO Y, MARUYAMA S, OBAYASHI M & INOUE H. 1994. Geologic implication of the whole mantle P-wave tomography. Journal of the Geological Society of Japan, 100: 4-23.
16. GORINI MA. 1981. The tectonic fabric of the Equatorial Atlantic and adjoining continental margins: Gulf of Guinea to Northeastern Brazil. Série Projeto REMAC, 9, Petrobras, Rio de Janeiro, 11-117.
17. GUNG Y & ROMANOWICZ B. 2004. Q tomography of the upper mantle using three component long period waveforms. Geophys. J. Int., 157: 813-830.
18. GURNIS M, MUELLER RD & MORESI L 1998. Cretaceous vertical motion of Australia and the Australian-Antarctic Discordance. Science, 279: 1499-1504.
19. HEKINIAN R, JUTEAU T, GRACIA E, UDINTSEV G, SICHLER B, SICHEL SE & APPRIOUAL R. 2000. Submersible observations of EquatorialAtlantic Mantle: The St. Paul Fracture Zone region. Marine Geophysical Research, 21: 529-560.
20. HEMOND C, LE FAOUDERA, BASSOULLET C, JUTEAU T & SICHEL S. 2002. Evidence for recycled crustal material within the upper mantle beneath the St. Paul Fracture Zone, Equatorial Atlantic. EOS Trans. AGU, 83: F1448.
21. HORAN MF, WALKER RJ, MORGAN JW, GROSSMAN JN & RUBIN AE. 2003. Highly siderophile elements in chondrites. Chemical Geology, 196:5-20.
22. LASSITER JC & HAURIEH. 1998. Osmium-isotope variations in Hawaiian lavas: evidence for recycled oceanic lithosphere in the Hawaiian plume. Earth Planet. Sci. Lett. 164: 483-496.
23. MARTIN CE. 1991. Osmium isotopic characteristics of mantle-derived rocks. Geochimicaet Cosmochimica Acta, 55(5): 1421-1434.
24. MARUYAMAS. 1994. Plume tectonics. Journal of the Geological Society of Japan, 100:24-49.
25. MEISELT, WALKER RJ & MORGAN JW 1996. The osmium isotopic composition of the Earth's primitive upper mantle. Nature, 383: 517-520.
26. MEISELT, WALKER RJ, IRVING AJ & LORAND JP 2001. Osmium isotopic compositions of mantle xenoliths: a global perspective. Geochimica et Cosmochimica Acta, 65:1311 -1323.
27. MÉVEL C. 2003. Serpentinization of abyssal peridotites at mid-ocean ridges. C.R. Geoscience, 335:825-852.
28. MOTOKIA, SICHEL SE, BAPTISTA NETO JA, SZATMARI P, MELLO SLM, SOARES R, MELO RC & PETRAKIS GH. 2008. Características geomorfológicas do Arquipélago de São Pedro e São Paulo, Oceano Atlântico Equatorial, e sua relação com a história de soerguimento. Revista Brasileira de Geomorfologia. Manuscript submitted for publication.
29. MUTTONI G, KENT DV, GARZANTI E, BRACK P, ABRAHAMSEN N & GAETANI M. 2003. Early Permian Pangea 'B' to Late Permian Pangea 'A. Earth and Planetary Science Letters, 215(3-4): 379-394.
30. OHARA Y, YOSHIDA T, KATO Y & KASUGA S. 2001. Giant megamullion in the Parece Vela backarc basin. Marine Geophysical Research, 22: 47-61.
31. RITSEMA J & VAN HEIJST HJ. 2000. Seismic imaging of structural heterogeneity in Earth's mantle: evidence for large-scale mantle flow. Sci. Progr, 83: 243-259.
32. RITZWOLLER MH, SHAPIRO NM & LEAHY GM. 2003. A resolved mantle anomaly as the cause of the Australian-Antarctic Discordance. J. Geophys. Res., 108(B12): 2559.
33. ROMANOWICZ B & GUNG Y 2002. Superplumes from the core-mantle boundary to the lithosphere. Science, 296: 513-516.
34. 186Os ratios of mid-ocean ridge basalts and abyssal peridotites. Geochimica et Cosmochimica Acta, 58(22): 5043-5054.
35. ROY-BARMAN M, WASSERBURG GJ, PAPANASTASSIOU DA & CHAUSSIDON M. 1998. Osmium isotopic compositions and Re-Os concentrations in sulfide globulesfrom basaltic glasses. Earth and Planetary Science Letters, 154(1-4): 331-347.
36. SCHILLING JG, RUPPEL C, DAVIS AN, McCULLY B, TIGHE SA, KINGSLEY RH & LIN J. 1995. Thermal structure of the mantle beneath the equatorial Mid-Atlantic Ridge: Inferences from the spatial variation of dredged basalt glass compositions. Journal of Geophysical Research, 100(B6): 10057-10076.
37. SCOTESE CR. 2004. The PALEOMAP Project. Available at: 〈http://www.scotese.com〉. Access on: December 15, 2007.
38. SHIREY SB & WALKER RJ. 1998. The Re-Os isotope system in cosmochemistry and high-temperature geochemistry. Annual Review of Earth and Planetary Sciences, 26: 423-500.
39. SICHEL SE. 1990. Petrology and Geochemistry of the South Atlantic Ridge and Geochemical variation along the Cameroon Volcanic Line - Graduate School of Oceanography, University of Rhode Island-USA. Ph.D. thesis, 537 p.
40. SMITH WH & SANDWELL DT. 1997. Global sea floor topography from satellite altimetry and ship depth soundings. Science Magazine, 277(5334): 1957-1962.
41. SNOW JE & DICK HBJ. 1995. Pervasive magnesium loss by marine weathering of peridotites. Geochim. Cosmochim. Acta, 59: 4219-4235.
42. SNOWJE & REISBERG L. 1995. Os isotopic systematics of the MORB mantle; results from altered abyssal peridotites. Earth and Planetary Science Letters, 133: 411-421.
43. STEINBERGER B. 2000. Slabs in the lower mantle - results of dynamic modelling compared with tomographic images and the geoid. Phys. Earth Planet. Inter, 118: 241-257.
44. TATSUMI Y & MARUYAMA S. 1989. Boninites and high-Mg andesites: tectonics and pedogenesis. In: CRAWFORD AJ (Ed.). Boninites and related rocks. Unwin Hyman Ltd. London, UK, 50-71.
45. THIBAUD R, GENTE P & MAIA M. 1998. A systematic analysis of the Mid-Atlantic Ridge morphology and gravity between 15°N and 40°N: constraints of the thermal structure. Journal of Geophysical Research, 103:24223-24243.
46. THOMPSON G. 1981. St. Peterand St. Paul Rocks (Equatorial Atlantic) and the surrounding sea floor. Technical report for National Science Foundation, Grant OCE 77-26842 and OCE 80-24930. Wood Hole Océanographic Institution, Massachusetts, USA. 35p. (unpublished).
47. TUCHOLKE BE, LIN J & KLEINROCK MC 1998. Megamullion and mullion structure defining oceanic metamorphic core complex on the MidAtlantic Ridge. Journal of Geophysical Research, 103:9857-9866.
48. TUCHOLKE BE, FUJIOKA K, ISHIHARAT, HIRTH G & KINOSHITA M. 2001. Submersible study of an oceanic megamullion in the central North Atlantic. Journal of Geophysical Research, 106:16145-16161.
49. WALKER RJ, CARLSON RW, SHIREY SB & BOYD FR. 1989. Os, Sr, Nd, and Pb isotope systematics of southern African peridotite xenoliths: implications for the chemical evolution of subcontinental mantle. Geochim. Cosmochim. Acta, 53:1583-1595.