Vol. 20 (1989)

Published: 1989-01-01

Preface

Wilson Teixeira

0-0
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Paleomagnétism and geochronology of mafic dikes from the regions of Salvador, Olivença and Uauá, São Francisco Craton, Brazil: present stage of the USP/Princeton University collaboration

M. S D'Agrella Filho, I. G Pacca, T. C Onstott, P. R Renne, W Teixeira

1-8
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Mafic dykes of Salvador (State of Bahia, Brazil): geological and petrological characteristics

C Moraes-Brito, G Bellieni, P Comin-Chiaramonti, A. J Melfi, E. M Piccirillo, M. A. F Tanner de Oliveira

9-14
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Preliminary petrographic and geochemical considerations on the precambrian mafic dykes of the Ilhéus-Olivença area, Bahia

M. A. F Tanner de Oliveira, G Bellieni, P Comin-Chiaramonti, A. J Melfi, E. M Piccirillo, C Moraes-Brito

15-19
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Structural features associated with mafic dikes: examples from the atlantic coastal belt of Bahia, Brazil

L. C. C Gomes, M. A. F Tanner de Oliveira, L. R. B Leal

21-24
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Mafic dykes in the southern part of the São Francisco craton: a tectonic review based on K/Ar geochronology

W Teixeira

25-30
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Proterozoic dikes of the Bom Sucesso region, Minas Gerais, Brazil

J. J. G Quéméneur

31-32
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Secular variation in the composition of Brazilian mafic dyke swarms: preliminary results

E. P Oliveira

33-36
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La/Nb variation in Proterozoic and Mesozoic mafic dyke swarms in Brazil

E. M Piccirillo, G Bellieni, C Moraes-Brito, P Comin-Chiaramonti, G Martins, M. H. F Macêdo, A. J Melfi, J. P. P Pinese, M. A. F Tanner de Oliveira

37-39
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Petrography and geochemistry of Proterozoic mafic dykes from the Guiana Shield, northern Amazon Craton

A Choudhuri

41-45
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Petrography and geochronology of amphibolitic rocks in the São José dos Quatro Marcos area, southwestern Mato Grosso, Brazil

M. A Carneiro

47-56
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First integrated photogeological map of the precambrian dyke swarm of Uruguai: some geological inferences

J Bossil, N Campal, I Garat, D Piñeyro, C Gomez Rifas

57-60
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Mesozoic mafic dykes of northeastern South America and correlations with similar dyke swarms in West África and eastern North America

A. N Sial, R. V Fodor, V. P Ferreira

61-63
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Tholeiitic dyke swarm from the Ponta Grossa Arch and genetic relationships to the Paraná flood volcanics (Brazil)

E. M Piccirillo, G Bellieni, G Cavazzini, P Comin-Chiaramonti, R Petrini, A. J Melfi, J. P. P Pinese, P Zantedeschi, A de Min

65-66
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Mesozoic mafic dyke swarm from Rio Ceará-Mirim (northeast Brazil)

G Martins, G Bellieni, P Comin-Chiaramonti, A. J Melfi, M. H. F Macedo, E. M Piccirillo

67-68
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An estimate of the degree of crustal extension and thinning associated with the Guapiara lineament based on aeromagnetic modelling

F. J. F Ferreira, R Monma, C. A. G Campanha, V. L Galli

69-70
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Magmatic occurrences of post-permian age of the South American Platform

F. F. M. de Almeida, C. D. R Carneiro

71-85
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Addendum

O Editor

71-85
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