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Book Chapter

Role of basaltic magmatism within the Parnaíba cratonic basin, NE Brazil

By
Marthe Klöcking
Marthe Klöcking
Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, UK
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Nicky White
Nicky White
Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, UK
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John MacLennan
John MacLennan
Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Madingley Rise, Madingley Road, Cambridge CB3 0EZ, UK
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Published:
January 01, 2018

Abstract

The sedimentary fill of the Parnaíba basin in NE Brazil is punctuated by two episodes of basaltic magmatism in Jurassic and Cretaceous times, known as the Mosquito and Sardinha formations, respectively. A quantitative understanding of the depth and degree of melting that generated these basalts should provide useful constraints on the history of vertical motions in this cratonic basin. We carried out forward and inverse modelling of major, trace and rare earth element concentrations for primitive melts from both igneous provinces. We calculated the melt fraction as a function of depth to determine the melt volumes and mantle potential temperatures. Our results suggest that both episodes of magmatism resulted from shallow decompression melting within the asthenospheric mantle. The Mosquito basalts record an excess temperature of 55–75°C and are probably related to the widespread Central Atlantic Magmatic Province associated with the initial break-up of Gondwanaland. By contrast, the Sardinha basalts record localized lithospheric thinning to less than half its original thickness with excess temperatures of 15–25°C. This younger activity is probably part of the Paraná–Etendeka large igneous province, which is linked to rifting between South America and Africa. We suspect that these magmatic episodes are associated with phases of regional epeirogenic uplift affecting the Parnaíba basin.

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Contents

Cratonic Basin Formation: A Case Study of the Parnaíba Basin of Brazil
CONTAINS OPEN ACCESS

M. C. Daly
M. C. Daly
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R. A. Fuck
R. A. Fuck
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J. Julià
J. Julià
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D.I.M. MacDonald
D.I.M. MacDonald
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A. B. Watts
A. B. Watts
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Geological Society of London
Volume
472
ISBN electronic:
9781786204127
Publication date:
January 01, 2018

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