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Fluid–rock interactions along detachment faults during continental rifting and mantle exhumation: the case of the Urdach lherzolite body (North Pyrenees)

Jehiel Nteme Mukonzo, View ORCID ProfileMarie-Christine Boiron, Yves Lagabrielle, View ORCID ProfileMichel Cathelineau and View ORCID ProfileBenoit Quesnel
Journal of the Geological Society, 178, jgs2020-116, 7 January 2021, https://doi.org/10.1144/jgs2020-116
Jehiel Nteme Mukonzo
1Université de Rennes, CNRS, UMR 6118 Géosciences Rennes, Campus de Beaulieu, 35000 Rennes, France
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Marie-Christine Boiron
2Université de Lorraine, CNRS, CREGU, GeoRessources, F-54000 Nancy, France
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  • ORCID record for Marie-Christine Boiron
  • For correspondence: Marie-christine.boiron@univ-lorraine.fr
Yves Lagabrielle
1Université de Rennes, CNRS, UMR 6118 Géosciences Rennes, Campus de Beaulieu, 35000 Rennes, France
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Michel Cathelineau
2Université de Lorraine, CNRS, CREGU, GeoRessources, F-54000 Nancy, France
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  • ORCID record for Michel Cathelineau
Benoit Quesnel
2Université de Lorraine, CNRS, CREGU, GeoRessources, F-54000 Nancy, France
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  • ORCID record for Benoit Quesnel
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Abstract

The North Pyrenean Zone corresponds to the palaeopassive margin of the North Iberia plate, at the foot of which subcontinental mantle was exhumed during Albian times. Rare bodies of exhumed mantle rocks associated with strongly sheared lenses of continental crust are scattered among the North Pyrenean Zone metasediments. Significant fluid flow occurred along a major décollement at the basement–Trias interface in the Urdach massif (Chaînons Béarnais). Fluids with a broad range of salinity (10–38 wt.% NaCl equiv.), indicative of mixing between brines and more dilute waters, produced strong silicification of breccias. The brines circulated at c. 240–280°C under lithostatic pressures at c. 6 ± 1 km depth. The fluids became increasingly saline towards the final stages. The syndeposition of Cenomano-Turonian flysch layers then progressively isolated the lower aquifers close to the décollement where Triassic brines were predominant. The release and migration of significant volumes of brines during stretching and squeezing of the Triassic evaporites played a crucial part in the mineralogical and rheological transformations that occurred during the Pyrenean Cretaceous rifting event.

  • © 2021 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 178 (2)
Journal of the Geological Society
Volume 178, Issue 2
March 2021
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Fluid–rock interactions along detachment faults during continental rifting and mantle exhumation: the case of the Urdach lherzolite body (North Pyrenees)

Jehiel Nteme Mukonzo, Marie-Christine Boiron, Yves Lagabrielle, Michel Cathelineau and Benoit Quesnel
Journal of the Geological Society, 178, jgs2020-116, 7 January 2021, https://doi.org/10.1144/jgs2020-116
Jehiel Nteme Mukonzo
1Université de Rennes, CNRS, UMR 6118 Géosciences Rennes, Campus de Beaulieu, 35000 Rennes, France
  • Find this author on Google Scholar
  • Find this author on PubMed
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Marie-Christine Boiron
2Université de Lorraine, CNRS, CREGU, GeoRessources, F-54000 Nancy, France
  • Find this author on Google Scholar
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  • Search for this author on this site
  • ORCID record for Marie-Christine Boiron
  • For correspondence: Marie-christine.boiron@univ-lorraine.fr
Yves Lagabrielle
1Université de Rennes, CNRS, UMR 6118 Géosciences Rennes, Campus de Beaulieu, 35000 Rennes, France
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Michel Cathelineau
2Université de Lorraine, CNRS, CREGU, GeoRessources, F-54000 Nancy, France
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  • ORCID record for Michel Cathelineau
Benoit Quesnel
2Université de Lorraine, CNRS, CREGU, GeoRessources, F-54000 Nancy, France
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  • ORCID record for Benoit Quesnel

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Fluid–rock interactions along detachment faults during continental rifting and mantle exhumation: the case of the Urdach lherzolite body (North Pyrenees)

Jehiel Nteme Mukonzo, Marie-Christine Boiron, Yves Lagabrielle, Michel Cathelineau and Benoit Quesnel
Journal of the Geological Society, 178, jgs2020-116, 7 January 2021, https://doi.org/10.1144/jgs2020-116
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