Seismic velocity anomalies beneath SE Brazil from P and S wave travel time inversions

Journal of Geophysical Research: Solid Earth

Volumn 108, Issue 4, 2003, Pages

  Schimmel, M ^a   Assumpcao M ^a   VanDecar, J C ^b  

^a UNIVERSITY OF SÃO PAULO   (Brazil)

^b GEOPHYSICAL LABORATORY   (United States)

Author keywords

Alkaline intrusions; Paran Etendeka flood basalts; SE Brazil; Seismic regional tomography; Subducted Nazca plate; Tristan da Cunha plume

Indexed keywords

MANTLE STRUCTURE; NAZCA PLATE; P-WAVE; S-WAVE; SEISMIC VELOCITY; TELESEISMIC WAVE; TRAVEL TIME;

(SOUTHEAST); BRAZIL;

EID: 0042812362     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: None     Document Type: Article

References (44)

1. Assumpçao, M., D. James, and J. A. Snoke, Crustal thickness in SE Brazilian shield by receiver function analysis: Implications for isostatic compensation, J. Geophys. Res., 107(B1), 2006, doi:10.1029/2001JB000422, 2002.
2. Bijwaard, H., W. Spakman, and E. R. Engdahl, Closing the gap between regional and global travel time tomography, J. Geophys. Res., 103, 30,055-30,078; 1998.
3. Brito Neves, B. B., and U. G. Cordani, Tectonic evolution of South America during the Late Proterozoic, Precambrian Res., 53, 23-40, 1991.
4. Brito Neves, B. B., R. Fuck, U. G. Cordani, and A. Thomaz, Influence of basement structures on the evolution of the major sedimentary basins of Brazil: A case of tectonic heritage, J. Geodyn., 1, 495-510, 1984.
5. Cline, A. K., FITPACK-Software Package for Curve and Surface Fitting Employing Splines Under Tensions, Dept. of Comput. Sci., Univ. of Tex. at Austin, Austin, Tex., 1981.
6. Constable, S. C., R. L. Parker, and C. G. Constable, Occams inversion: A practical algorithm for generating smooth models from electromagnetic sounding data, Geophysics, 52, 289-300, 1987.
7. Cordani, U. G., B. B. Brito Neves, R. A. Fuck, R. Porto, A. T. Filho, and F. M. Bezerra da Cunha, Estudo preliminar de integração do Pré-cambriano com os eventos tectônicos das bacias sedimentares brasileiras, in Revista Cienca Tecnica Petroleo, Rep. 15, 70 pp., Petrobrás, Cent. de Pesqui. e Desenvolvimento Leopoldo A. Maguez de Mello (CENPES), Rio de Janeiro, Brazil, 1994.
8. Engdahl, E. R., R. D. Van der Hilst, and J. Berrocal, Imaging of subducted lithosphere beneath South America, Geophys. Res. Lett., 22, 2317-2320, 1995.
9. Engdahl, E. R., R. D. Van der Hilst, and R. P. Buland, Global teleseismic earthquake relocation with improved travel times and procedures for depth determination, Bull. Seismol. Soc. Am., 88, 722-743, 1998.
10. Gibson, S. A., R. N. Thompson, O. H. Leonardos, A. P. Dickin, and J. G. Mitc̀hell, The limited extent of plume-lithosphere interactions during continental flood-basalt genesis: Geochemical evidence from Cretaceous magmatism in southern Brazil, Contrib. Mineral. Petrol., 137, 147-169, 1999.
11. Gr̀and, S. P., Mantle shear structure beneath the Americas and surrounding oceans, J. Geophys. Res., 99, 11,591-11,621, 1994.
12. Huber, P. J., Robust Statistics, John Wiley, New York, 1981.
13. James, D. E., and M. Assumpçao, Tectonic implications of S-wave anisotropy beneath SE Brazil, Geophys. J. Int., 126, 1-10, 1996.
14. Kennett, B. L. N., and E. R. Engdahl, Travel times for global earthquake location and phase identification, Geophys. J. Int., 105, 429-465, 1991.
15. Kennett, B. L. N., and S. Widiyantoro, A low seismic wavespeed anomaly beneath northwestern India: A seismic signature of the Deccan plume?, Earth Planet Sci. Lett., 165, 145-155, 1999.
16. King, S. D., and J. Ritsema, African hot spot volcanism: Small-scale convection in the upper mantle beneath cratons, Science, 290, 1137-1140, 2000.
17. Lévèque, J.-L., L. Rivera, and G. Wittlinger, On the use of the checkerboard test to assess the resolution of tomographic inversions, Geophys. J. Int., 115, 313-318, 1993.
18. Neele, F., J. VanDecar, and R. Snieder, The use of P-wave amplitude data in a joint inversion with travel times for upper mantle velocity structure, J. Geophys. Res., 98, 12,033-12,054, 1993.
19. O'Connor, J. M., and R. A. Duncan, Evolution of the Walvis Ridge-Rio Grande Rise hot spot system: Implications for African and South American plate motions over plumes, J. Geophys. Res., 95, 17,475-17,502, 1990.
20. Paige, C. C., and M. A. Saunders, LSQR: An algorithm for sparse linear equations and sparse least squares, ACM Trans. Math. Software, 8, 43-71, 1982.
21. Peate, D. W., C. J. Hawkesworth, M. M. S. Mantovani, N. W. Rodgers, and S. P. Turner, Petrogenesis and stratigraphy of the high Ti/Y Urubici magma type in the Paraná flood basalt province and implications for the nature of "Dupal"-type mantle in the South Atlantic region, J. Petrol., 40, 451-473, 1999.
22. 1 norms of International Seismological Centre travel time residuals, J. Geophys. Res., 98, 699-734, 1993.
23. Renne, P. R., K. Deckart, M. Ernesto, G. Féraud, and E. M. Piccirillo, Age of Ponta Grossa dike swarm (Brazil), and implications to Paraná flood volcanism, Earth Planet Sci. Lett., 144, 199-211, 1996.
24. Richardson, W. P., E. A. Okal, and S. Van der Lee, Rayleigh-wave tomography of the Ontong-Java Plateau, Phys. Earth Planet Inter., 118, 29-51, 2000.
25. Ritsema, J., A. A. Nyblade, T. J. Owens, C. A. Langston, and J. C. Van-Decar, Upper mantle seismic velocity structures beneath Tanzania, east Africa: Implications for the stability of cratonic lithosphere, J. Geophys. Res., 103, 21,201-21,213, 1998.
26. Schimmel, M., Phase cross-correlations: design, comparisons and applications, Bull. Seismol. Soc. Am., 89, 1366-1378, 1999.
27. Schobbenhaus, C., Geologic Map of Brazil and Adjoining Ocean Floor Including Mineral Deposits. Editora S.A. Abril, São Paulo, 1984.
28. Silveira, G., E. Stutzmann, D.-A. Griot, J.-P. Montagner, and L. M. Victor, Anisotropic tomography of the Atlantic Ocean from Rayleigh surface waves, Phys. Earth Planet Inter., 106, 257-273, 1998.
29. Snieder, R., The role of nonlinearity in inverse problems. Inverse Probl., 14, 387-404, 1998.
30. Snoke, J. A., and D. E. James, Lithospheric structure of the Chaco and Paraná Basins of South America from surface-wave inversion, J. Geophys. Res., 102, 2939-2951, 1997.
31. Sobolev, S. V., A. Grésillaud, and M. Cara, How robust is isotropic delay time tomography for anisotropic mantle?, Geophys. Res. Lett., 26, 509-512, 1999.
32. Szatmari, P., J. Conceicao, N. Destro, P. Smith, N. Evensen, and D. York, Tectonic and sedimentary effects of a hot-spot track of alkali intrusions defined by Ar-Ar dating in SE Brazil, 31th Geological Congress, Abstracts Volume (CD-ROM), Rio de Janeiro, 2000.
33. Trampert, J., Global seismic tomography: the inverse problem and beyond, Inverse Probl., 14, 371-385, 1998.
34. Trompette, R., Geology of Western Gondwana (2000-500 Ma), Pan-African-Brasiliano Aggregation of South America and Africa, A. A. Balkema, Brookfield, Vt., 1994.
35. VanDecar, J. C., and R. S. Crosson, Determination of teleseismic relative phase arrival times using multi-channel cross-correlation and least squares, Bull. Seismol. Soc. Am., 80, 150-169, 1990.
36. VanDecar, J. C., D. E. James, and M. Assumpçao, Seismic evidence for a fossil plume beneath South America and implications for plate driving forces, Nature, 378, 25-31, 1995.
37. Van der Hilst, R. D., S. Widiyantoro, and E. R. Engdahl, Evidence for deep mantle circulation from global tomography, Nature, 386, 578-584, 1997.
38. Van der Lee, S., D. James, and P. Silver, Upper mantle S-velocity structure of central and western South America, J. Geophys. Res., 106, 30,821-30,834, 2001:
39. Vauchez, A., A. Tommasi, and Egydio-Silva, Self-indentation of a heterogeneous continental lithosphere, Geology, 22, 967-970, 1994.
40. Vauchez, A., G. Barruol, and A. Tommasi, Why do continents break up parallel to ancient orogenic belts?, Terra Nova, 9, 62-66, 1997.
41. Vdoyin, O., J. A. Rial, A. L. Levshin, and M. H. Ritzwoller, Group-velocity tomography of South America and the surrounding oceans, Geophys. J. Int., 136, 324-340, 1999.
42. Vitorello, I., V. M. Hamza, and H. Pollack, Terrestrial heat flow in the Brazil highlands, J. Geophys. Res., 85, 3778-3788, 1980.
43. Wessel, P., and W. H. F. Smith, Free software helps map and display data, Eos Trans. AGU, vol. 72, p. 441, 445-446, 1991.
44. Wolfe, C. J., I. T. Bjarnason, J. C. VanDecar, and S. C. Solomon, Seismic structure of the Iceland mantle plume, Nature, 385, 245-247, 1997.