New constraints on the geochronology and Sm-Nd isotopic characteristics of Bas-Drâa mafic dykes, Anti-Atlas of Morocco
(2017) In Journal of African Earth Sciences 127. p.77-87- Abstract
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... (More)
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.
(Less)
- author
- El Bahat, Abdelhakim ; Ikenne, Moha ; Cousens, Brian ; Söderlund, Ulf LU ; Ernst, Richard ; Klausen, Martin B. and Youbi, Nasrrddine
- organization
- publishing date
- 2017-03-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Anti-Atlas, Ar–Ar geochronology, Bas-Drâa, Mafic dykes, Model age, Sm-Nd, West African Craton
- in
- Journal of African Earth Sciences
- volume
- 127
- pages
- 11 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85007496800
- wos:000395223700006
- ISSN
- 1464-343X
- DOI
- 10.1016/j.jafrearsci.2016.09.003
- language
- English
- LU publication?
- yes
- id
- be21aa11-e8d7-47f0-b56f-254c5b8610d4
- date added to LUP
- 2017-02-20 09:02:56
- date last changed
- 2024-04-28 06:51:16
@article{be21aa11-e8d7-47f0-b56f-254c5b8610d4, abstract = {{<p>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 <sup>40</sup>Ar-<sup>39</sup>Ar 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 <sup>143</sup>Nd/<sup>144</sup>Nd 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.</p>}}, author = {{El Bahat, Abdelhakim and Ikenne, Moha and Cousens, Brian and Söderlund, Ulf and Ernst, Richard and Klausen, Martin B. and Youbi, Nasrrddine}}, issn = {{1464-343X}}, keywords = {{Anti-Atlas; Ar–Ar geochronology; Bas-Drâa; Mafic dykes; Model age; Sm-Nd; West African Craton}}, language = {{eng}}, month = {{03}}, pages = {{77--87}}, publisher = {{Elsevier}}, series = {{Journal of African Earth Sciences}}, title = {{New constraints on the geochronology and Sm-Nd isotopic characteristics of Bas-Drâa mafic dykes, Anti-Atlas of Morocco}}, url = {{http://dx.doi.org/10.1016/j.jafrearsci.2016.09.003}}, doi = {{10.1016/j.jafrearsci.2016.09.003}}, volume = {{127}}, year = {{2017}}, }