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Evidences for multiple remagnetization of Proterozoic dykes from Iguerda inlier (Anti-Atlas Belt, Southern Morocco)

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Abstract

No paleomagnetic data exist for Paleo-Mesoproterozoic times of the West African Craton (WAC). Therefore, paleogeographic reconstructions for such old geological times are difficult to constrain. Gaps on the sedimentary record and intense remagnetizations are the major problems that paleomagnetic studies come across. Recent geochronological results for dyke swarms that intrude several Proterozoic inliers of WAC in the Anti-Atlas Belt (southern Morocco) revealed ages between Paleoproterozoic and early Neoproterozoic, opening for the first time a window of opportunity to conduct paleomagnetic studies and tentatively infer about the paleoposition of WAC during Proterozoic. On this scope we conducted a paleomagnetic study on seven Proterozoic dykes of the Iguerda inlier. The meaning of the obtained paleomagnetic directions was evaluated by rock magnetic and mineral analyses, complemented by petrographic observations. Our samples record the presence of a complex history of remagnetization, mostly assigned to several Phanerozoic thermal/chemical events, in particular to the late stages of Pan African orogeny (s.l.), to the Late Carboniferous Variscan orogeny, and even to more recent events. The recognized remagnetization processes are related to widespread metamorphic events under greenschist facies followed by low-temperature oxidation, both responsible for the formation of new magnetic phases, like magnetite and hematite. These events obliterated the primary (magmatic) thermo-remanent magnetization and promoted multiple remagnetizations of the dykes, thermally and chemically. For only one dyke the presence of primary magnetization is possible to infer, though not to confirm, and would place WAC at an equatorial position around 1750 Ma.

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Authors and Affiliations

  1. Instituto Dom Luiz, Univ. Lisboa, Lisbon, Portugal

    Marta Neres, Pedro F. Silva, Sofia Martins, João Mata, Francisco Almeida & Nasrrddine Youbi

  2. Instituto Português do Mar e da Atmosfera, Lisbon, Portugal

    Marta Neres

  3. Instituto Politécnico de Lisboa, Instituto Superior de Engenharia de Lisboa (ADF), Lisbon, Portugal

    Pedro F. Silva

  4. Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal

    Sofia Martins & João Mata

  5. Department of Geology, Faculty of Sciences, Ibnou Zohr University, P.O. Box 28/S, Agadir, Morocco

    Moha Ikenne

  6. Georessources Laboratory (URAC 42), Department of Earth Sciences, Faculty of Sciences & Technics, Cadi Ayyad University, Abdelkarim El Khattabi Avenue, P.O. Box 549, Marrakech, Morocco

    Ahmid Hafid

  7. Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Prince Moulay Abdellah Boulevard, P.O. Box 2390, Marrakech, Morocco

    Nasrrddine Youbi & Moulay A. Boumehdi

Authors
  1. Marta Neres
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  2. Pedro F. Silva
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  3. Moha Ikenne
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  4. Sofia Martins
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  5. Ahmid Hafid
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  6. João Mata
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  7. Francisco Almeida
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  8. Nasrrddine Youbi
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  9. Moulay A. Boumehdi
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Corresponding author

Correspondence to Marta Neres.

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Neres, M., Silva, P.F., Ikenne, M. et al. Evidences for multiple remagnetization of Proterozoic dykes from Iguerda inlier (Anti-Atlas Belt, Southern Morocco). Stud Geophys Geod 60, 700–730 (2016). https://doi.org/10.1007/s11200-014-0178-x

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  • DOI: https://doi.org/10.1007/s11200-014-0178-x

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