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Ulf Söderlund

Ulf Söderlund

Professor

Ulf Söderlund

New constraints on the geochronology and Sm-Nd isotopic characteristics of Bas-Drâa mafic dykes, Anti-Atlas of Morocco

Författare

  • Abdelhakim El Bahat
  • Moha Ikenne
  • Brian Cousens
  • Ulf Söderlund
  • Richard Ernst
  • Martin B. Klausen
  • Nasrrddine Youbi

Summary, in English

The Precambrian inliers of the Anti-Atlas belt across the southern part of Morocco contain numerous mafic dyke and sill swarms, which are thought to represent the erosional remnants of Proterozoic Large Igneous Provinces (LIPs). As part of an extended research campaign to date and characterize these LIPs, two amphiboles from one dyke within the Bas-Drâa inlier (western Anti-Atlas) yielded consistent 40Ar-39Ar ages of 611 Ma ± 1.3; i.e., evidence of magmatic activity during the Ediacaran (635-542 Ma). Furthermore, Nd isotope ratios and model ages identifies four groups of dykes within the Bas-Drâa inlier, all of which were derived from a previously enriched mantle reservoir with very low 143Nd/144Nd ratios (0.51065–0.51170) and corresponding εNd(t) values (−16.44 to −2.45). Such low Nd-ratios arguably reflect either a contribution of crustal components, such as the Paleoproterozoïc schisto-granitic basement, or metasomatic modification of the sub-continental lithospheric mantle.

Avdelning/ar

  • Berggrundsgeologi

Publiceringsår

2017-03-01

Språk

Engelska

Sidor

77-87

Publikation/Tidskrift/Serie

Journal of African Earth Sciences

Volym

127

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Geology

Nyckelord

  • Anti-Atlas
  • Ar–Ar geochronology
  • Bas-Drâa
  • Mafic dykes
  • Model age
  • Sm-Nd
  • West African Craton

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 1464-343X