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Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from 40Ar/39Ar hornblende, biotite and titanite fission-track dating

M. C. Daszinnies, J. Jacobs, J.-A. Wartho and G. H. Grantham
Geological Society, London, Special Publications, 324, 261-286, 1 January 2009, https://doi.org/10.1144/SP324.18
M. C. Daszinnies
1Department of Geosciences, University of Bremen, P.O. Box 330440, D-28334 Bremen, Germany
2Present address: SINTEF Petroleum Research, Basin Modelling Group, S. P. Andersens vei 15 B, NO-7031, Trondheim, Norway
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  • For correspondence: [email protected]
J. Jacobs
1Department of Geosciences, University of Bremen, P.O. Box 330440, D-28334 Bremen, Germany
3Department of Earth Sciences, University of Bergen, Allegaten 41, N-5007 Bergen, Norway
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J.-A. Wartho
4John de Laeter Centre of Mass Spectrometry, Department of Applied Geology, Curtin University, Perth, WA 6845, Australia
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G. H. Grantham
5Council for Geosciences, P/Bag X112, 0012 Pretoria, South Africa
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Abstract

This research paper investigates the thermo-tectonic history of the north Mozambican basement subsequent to the Pan-African metamorphism. Six 40Ar/39Ar hornblende, three 40Ar/39Ar biotite and 25 titanite fission-track data place new constraints on the earliest timing of rifting in the central sector of Gondwana, and demonstrate a close linkage between the geometric rift configuration and the ductile metamorphic basement fabrics during the initial dispersal of the supercontinent.

The 40Ar/39Ar hornblende and biotite ages range from c. 542 to 456 Ma and from c. 448 to 428 Ma, respectively. These data record slow basement cooling after the latest Pan-African metamorphism at rates of c. 7–11 °C Ma−1 between Early and Late Ordovician times. Locally, syn- to post-tectonic granitoid emplacements around 500–450 Ma delayed basement cooling to Late Ordovician–Early Silurian times. The titanite fission-track (TFT) ages fall into two age groups of c. 378–327 Ma and c. 284–219 Ma. The older TFT ages record very slow cooling from the Late Ordovician–Early Silurian to below 275±25 °C in the Late Devonian–Early Carboniferous at slow rates of less than 1 °C Ma−1. This slow cooling is related to decreasing denudation in association with the establishment of pre-Karoo peneplains in central Gondwana. The younger TFT ages record denudation due to rift flank uplift in the context of initial Gondwana disintegration in the Mozambican sector. Corresponding Early–Late Permian crustal extension proceeded obliquely to a NW–SE tensional palaeo-stress field and was associated with a brittle reactivation of easterly trending ductile basement fabrics. In total, up to ≤9–12 km of denudation is deduced from the TFT results since Permo-Carboniferous times.

  • © Geological Society of London 2009
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Geological Society, London, Special Publications: 324 (1)
Geological Society, London, Special Publications
Volume 324
2009
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Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from 40Ar/39Ar hornblende, biotite and titanite fission-track dating

M. C. Daszinnies, J. Jacobs, J.-A. Wartho and G. H. Grantham
Geological Society, London, Special Publications, 324, 261-286, 1 January 2009, https://doi.org/10.1144/SP324.18
M. C. Daszinnies
1Department of Geosciences, University of Bremen, P.O. Box 330440, D-28334 Bremen, Germany
2Present address: SINTEF Petroleum Research, Basin Modelling Group, S. P. Andersens vei 15 B, NO-7031, Trondheim, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: [email protected]
J. Jacobs
1Department of Geosciences, University of Bremen, P.O. Box 330440, D-28334 Bremen, Germany
3Department of Earth Sciences, University of Bergen, Allegaten 41, N-5007 Bergen, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J.-A. Wartho
4John de Laeter Centre of Mass Spectrometry, Department of Applied Geology, Curtin University, Perth, WA 6845, Australia
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
G. H. Grantham
5Council for Geosciences, P/Bag X112, 0012 Pretoria, South Africa
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  • Find this author on PubMed
  • Search for this author on this site

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Post Pan-African thermo-tectonic evolution of the north Mozambican basement and its implication for the Gondwana rifting. Inferences from 40Ar/39Ar hornblende, biotite and titanite fission-track dating

M. C. Daszinnies, J. Jacobs, J.-A. Wartho and G. H. Grantham
Geological Society, London, Special Publications, 324, 261-286, 1 January 2009, https://doi.org/10.1144/SP324.18
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