Seismic evidences of recurrent volcanism across the North Brazilian and the Fernando de Noronha ridges – Brazilian Equatorial Atlantic Ocean

Marcos V. M. Santos, Antonio T. Reis, Cleverson Guizan Silva, Marcus Aguiar Gorini, Natália Caldas Albuquerque


ABSTRACT. This study, based on the interpretation of LEPLAC (the Brazilian Continental Shelf Survey Project) deep seismic lines (~16.0 s twtt), reveals for the first time across the Brazilian Equatorial Atlantic Ocean seismic evidences that buried portions of individual volcanic edifices of the North Brazilian and the Fernando de Noronha volcanic ridges are laterally coupled with a series of volcanic wedges. Our analyses evidence that these magmatic occurrences are presented as layered volcanic bodies as wide as 80 km and as thick as 1.2 s (twtt) close to the volcanic edifices. Volcanic wedges occur as layered prograding bodies stemming directly from the major volcanic edifices of both ridges. Seismic analyses also reveal that numerous layered volcanic accumulations associated to a same individual volcanic edifice may occur along variable stratigraphic levels. These occurrences indicate that the evolution of the North Brazilian and the Fernando de Noronha volcanic ridges is followed by a long history of recurrent volcanic activities that may have possibly been synchronous in distinct volcanic edifices distant apart.

Keywords: seamounts, guyots, volcanic seismic facies, volcanostratigraphy, intraplate volcanic ridges.


seamounts, guyots, volcanic seismic facies, volcanostratigraphy, intraplate volcanic ridges.

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ALBERONI, A.A.L., I.K. JECK, C.G. SILVA, and L.C. TORRES, 2020, The new Digital Terrain Model (DTM) of the Brazilian Continental Margin: detailed morphology and revised undersea feature names: Geo-Marine Letters, 40, 949-964, doi: 10.1007/s00367-019-00606-x

Almeida, F.F.M., 2006, Ilhas oceânicas brasileiras e suas relações com a tectônica atlântica: Terrae Didatica, 2, 3-18, doi: 10.20396/td.v2i1.8637462

Almeida F.F.M., 2012, Ilhas oceânicas brasileiras, in Hasui Y., C.D.R. Carneiro, F.F.M. Almeida, and A. Bartorelli, Eds., Geologia do Brasil, Beca, São Paulo, Brazil, 658-662.

Aslanian D., F. Gallais, A. Afilhado, P. Schnurle, M. Moulin, M. Evain, D. Dias, J. Soares, R. Fuck, O.C. Pessoa Neto, and A. Viana, 2021, Deep structure of the Pará-Maranhão/Barreirinhas passive margin in the equatorial Atlantic (NE Brazil): Journal of South American Earth Sciences, 110, 103322, doi: 10.1016/j.jsames.2021.103322

Azevedo, R., 1991, Tectonic Evolution of Brazilian Equatorial Continental Margin Basins: PhD Thesis on Department of Geology Royal School of Mines Imperial College Prince Consort Road London, 1991, 455 pp.

Berndt, C., S. Planke, E. Alvestad, F. Tsikalas, and T. Rasmussen, 2001, Seismic volcanostratigraphy of the Norwegian Margin: constraints on tectonomagmatic break-up processes: Journal of the Geological Society, London, 158, 413-426, doi: 10.1144/jgs.158.3.413

Bizzi, L.A., C. Schobbehaus, J.H. Gonçalves, F.J. Baars, I.M. Delgado, M.B. Abram, R. Leão Neto, G.M.M. Matos, and J.O.S. Santos, 2003, Geologia, Tectônica e Recursos Minerais do Brasil: texto, mapas e SIG : Brasília, DF, Brazil, CPRM, 674 pp.

Braga, A.P.G., C.A.B. Passos, E.M. Souza, J.B. França, M.F. Medeiros, and V.A. Andrade, 1981, Geologia da região nordeste do Estado do Ceará, Projeto Fortaleza, Brazil: DNPM. Geologia, 12.

Bryan, G.M., N. Kumar, and P.J. Castro, 1973, The North Brazilian Ridge and the extension of the Equatorial Fracture Zones into the continent: XXVI Congresso Brasileiro de Geologia, Belém, PA, Brazil, SBG-Norte, 133-144.

Cordani, U.G., 1970, Idade do Vulcanismo do Oceano Atlântico Sul: Boletim do Instituto de Geociências e Astronomia - USP, 1, 9-75, doi: 10.11606/issn.2316-9001.v1i0p09-75

Ernesto, M., 2006, Drift of South American Platform since Early Cretaceous: Reviewing the apparent polar wander path: Revista Geociências UNESP, 25, 83-90.

FODOR, R.V., S.B. MUKASA, and A.N. SIAL, 1998, Isotopic and trace element indications of lithospheric and asthenospheric components in Tertiary alkalic basalts, northeastern Brazil: Lithos, 43, 197-217, doi: 10.1016/S0024-4937(98)00012-7

FODOR, R.V., A.N. SIAL, and G. GANDHOK, 2002, Petrology of spinel peridotite xenoliths from northeastern Brazil: lithosphere with a high geothermal gradient imparted by Fernando de Noronha plume: Journal of South American Earth Sciences, 15, 199-214, doi: 10.1016/S0895-9811(02)00032-9

Gorini, M.A., 1977, The Tectonic Fabric of the Equatorial Atlantic and Adjoining Continental Margins: Gulf of Guinea to Northeastern Brazil: PhD Thesis for The Degree of Philosophy in The Faculty of Pure Science, Columbia University, USA, 1977, 116 pp.

Guimarães, A.R., J.G. Fitton, L.A. Kirstein, and D.N. Barfod, 2020, Contemporaneous intraplate magmatism on conjugate South Atlantic margins: A hotspot conundrum: Earth and Planetary Science Letters, 536, 1-8, doi: 10.1016/j.epsl.2020.116147

HAYES, D.E., and M. EWING, 1970, North Brazilian Ridge and Adjacent Continental Margin: The American Association Petroleum Geologists Bulletin, 54, 2120-2150, doi: 10.1306/5D25CC75-16C1-11D7-8645000102C1865D

Hensen, C., J.C. Duarte, P. Vannucch, A. Mazzini, A.A. Lever, P. Terrinha, L. Géli, P. Henry, H. Villinger, J. Morgan, M. Schmidt, M.A. Gutscher, R. Bartolome, Y. Tomonaga, A. Polonia, E. Gràcia, U.Tinivella, M. Lupi, M.N. Ça?atay, M. Elvert, D. Sakellariou, L. Matias, Kipfer, R., A.P. Karageorgis, L. Ruffine, V. Liebetrau, C. Pierre, C. Schmidt, L. Batista, L. Gasperini, E. Burwicz, M. Neres, and M. Nuzzo, 2019, Marine Transform Faults and Fracture Zones: A Joint Perspective Integrating Seismicity, Fluid Flow and Life: Frontiers in Earth Science, 7, 39, doi: 10.3389/feart.2019.00039

Houtz, R.E., W.J. Ludwig, J.D. Milliman, and J.A. Grow, 1977, Structural of the northern Brazilian continental Margin: Geological Society of America Bulletin, 88, 711-719, doi: 10.1130/0016-7606(1977)88<711:SOTNBC>2.0.CO;2

Infante-Paez, L., and K.J. Marfurt, 2017, Seismic expression and geomorphology of igneous bodies. A Taranaki Basin, New Zealand case study: Interpretation, 5, SK121- SK140, doi: 10.1190/INT-2016-0244.1

Le Pichon, X., and D.E. Hayes, 1971, Marginal Offsets, Fracture Zones and the Early Opening of the South Atlantic: Journal of Geophysical Research, 76, 6283-6293, doi: 10.1029/JB076i026p06283

Matos, R.M.D., 2000, Tectonic Evolution of the Equatorial South Atlantic: Atlantic Rifts and Continental Margins: American Geophysical Union. Geophysical Monograph, 115, 331-354.


Matos, R.M.D., I. Norton, E. Casey, and A. Krueger, 2019, An orthogonal zone between the Equatorial and South Atlantic margins: relevance and control in the evolution of the Afro-Brazilian basins: 16th International Congress of the Brazilian Geophysical Society, Rio de Janeiro, Brazil, SBGf, doi: 10.22564/16cisbgf2019.030

Mizusaki, A.M.P., A. Thomaz-Filho, E.J. Milani, P. and Césero, 2002, Mesozoic and Cenozoic igneous activity and its tectonic control in the northeastern Brazil: Journal of South American Earth Sciences, 15, 183-198, doi: 10.1016/S0895-9811(02)00014-7

Moulin, M., D. Aslanian, and P. Unternehr, 2010, A new starting for the South and Equatorial Atlantic Ocean. Earth-Science Reviews, 98, 1-37, doi: 10.1016/j.earscirev.2009.08.001

Niu, Y.L., 2021. Lithosphere thickness controls the extent of mantle melting, depth of melt extraction and basalt compositions in all tectonic settings on Earth - A review and new perspectives: Earth-Science Reviews, 217, 103614, doi: 10.1016/j.earscirev.2021.103614

O'connor J.M., and R.A. Duncan, 1990, Evolution of the Walvis Ridge-Rio Grande Rise Hot Spot System: Implications for African and South American Plate Motions Over Plumes: Journal of Geophysical Research, 95, 17475-17502, doi: 10.1029/JB095iB11p17475

Planke, S., P.A. Symonds, E. Alvestad, and J. Skogseid, 2000, Seismic volcanostratigraphy of large-volume basaltic extrusive complexes on rifted margins: Journal of Geophysical Research, 105, 19335-19351, doi: 10.1029/1999JB900005

Planke S., Rasmussen T., Rey S.S., and Myklebust R., 2005, Seismic characteristics and distribution of volcanic intrusions and hydrothermal vent complexes in the Vøring and Møre basins, in DORÉ A.G., and VINNING B.A. (Eds.). Petroleum geology: NorthWest Europe and global perspectives. Proceedings of the 6th Petroleum Geology Conference, London, 833-844, doi: 10.1144/0060833

RABINOWITZ, P.D., and LABRECQUE, J., 1979, The Mesozoic South Atlantic Ocean and evolution of continental margins: Journal of Geophysical Research, 84, 5973-6002, doi: 10.1029/JB084iB11p05973

Rey, S.S., Planke, S., Symonds, P.A., and Faleide, J.I., 2008, Seismic volcanoestratigraphy of the Gascoyne margin, Western Australia: Journal of Volcanology and Geothermal Research, 172, 112-131, doi: 10.1016/j.jvolgeores.2006.11.013

SANDWELL, D.T., and SMITH, W.H.F., 1997, Marine gravity anomaly from Geosat and ERS-1 satellite altimetry: Journal of Geophysical Research Atmospheres, 102, 10039-10054, doi: 10.1029/96JB03223

Soares Jr., A.V., Costa, J.B.S., and Hasui, Y., 2008, Evolução da Margem Atlântica Equatorial do Brasil: Três fases distensivas: Revista Geociências UNESP, 27, 427-437.

Teixeira, W., Tassinari, C.C.G., and Siga Jr., O., 1978, Interpretação Geocronológica da folha SA-24 Fortaleza - Natal. Projeto RADAMBRASIL, Natal, Brazil. 18 pp.

Turner, S., Hawkesworth, C., Gallagher, K., Stewart, K., Peate, D., and Mantovani, M., 1996, Mantle plumes, flood basalts, and thermal models for melt generation beneath continents: Assessment of a conductive heating model and application to the Paraná: Journal of Geophysical Research, 101, 11503-11518, doi: 10.1029/96JB00430

ULBRICH, M.N.C., MARQUES, L.S., and LOPES, R.P., 2004, As ilhas vulcânicas Brasileiras: Fernando de Noronha e Trindade, in V. Mantesso-Neto, A. Bartorelli, C.D.R. Carneiro, and B.B.B. Neves (Eds.) Geologia do Continente Sul-Americano: Evolução da Obra de Fernando Flávio Marques de Almeida. São Paulo, Brazil: Beca, Chapter XXXI. 555-573.

White, R.S., 1992, Magmatism during and after continental break-up, in Storey, B.C., Alabaster, T., and R.J. Pankhurst, (Eds) Magmatism and the causes of Continental Break-up, Geological Society, Special Publication, 68, 1-16, doi: 10.1144/GSL.SP.1992.068.01.01


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