Age of the Wirgane granodiorite intrusions (Western High-Atlas, Morocco): New U–Pb constraints

✍ Scribed by Aatika Eddif; Dominique Gasquet; Christian Hoepffner; Gilles Levresse

• Book ID: 104019952
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 784 KB
• Volume: 47
• Category: Article
• ISSN: 1464-343X
• DOI: 10.1016/j.jafrearsci.2007.02.003

✦ Synopsis

U-Pb geochronological data, obtained on single zircon grains using the ion microprobe Cameca IMS 1270 (CRPG-CNRS, Nancy), indicate a Neoproterozoic age (625 ± 5 Ma) for the two intrusions of Wirgane granodiorite. This age is in variance with the previously published conclusions where the intrusions were supposed Variscan. Consequently, the Wirgane intrusions are interpreted as remnants of the Neoproterozoic basement of the Variscan belt. They are similar to the Anti-Atlas calc-alkaline intrusions of the collisional to postcollisional stages of the Pan-African orogeny. At that time, the Wirgane region was an area of continental growth to the north of the major South Atlasic Fault.