Skip to Main Content
Book Chapter

In situ U-Pb zircon geochronology on metapelitic granulites of Beni Bousera (Betic-Rif system, N Morocco)

By
M. Melchiorre
M. Melchiorre
Group of Dynamics of the Lithosphere, Institute of Earth Sciences Jaume Almera (ICTJA)–Consejo Superior de Investigaciones Científicas (CSIC), Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
Search for other works by this author on:
A.M. Álvarez-Valero
A.M. Álvarez-Valero
Department of Geology, University of Salamanca, 37008 Salamanca, Spain
Search for other works by this author on:
J. Vergés
J. Vergés
Group of Dynamics of the Lithosphere, Institute of Earth Sciences Jaume Almera (ICTJA)–Consejo Superior de Investigaciones Científicas (CSIC), Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
Search for other works by this author on:
M. Fernàndez
M. Fernàndez
Group of Dynamics of the Lithosphere, Institute of Earth Sciences Jaume Almera (ICTJA)–Consejo Superior de Investigaciones Científicas (CSIC), Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
Search for other works by this author on:
E.A. Belousova
E.A. Belousova
ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and Geochemical Evolution and Metallogeny of Continents (GEMOC), Macquarie University, Sydney, NSW 2109, Australia
Search for other works by this author on:
A. El Maz
A. El Maz
Department of Geology, University Moulay Ismail, Meknes, Morocco
Search for other works by this author on:
A. Moukadiri
A. Moukadiri
Department of Geology, University Bed Men Abdallah, Fes, Morocco
Search for other works by this author on:
Published:
January 01, 2017
23 November 2016

ABSTRACT

Integration of geochronological analyses of in situ zircons with the petrological study of their microstructural growth microdomains (through petrography and phase diagram modeling) yields a more precise interpretation and understanding of any geological process than the study of ages from separate zircons. This is essential especially for those rocks affected by polymetamorphic histories. We present new in situ U-Pb zircon dating from metapelitic granulites exposed in the contact with the ultramafic massif of Beni Bousera (northern Morocco, Western Mediterranean). Geochronological data scatter from Paleoproterozoic (1508 ± 23 Ma) to Miocene (22.9 ± 0.7 Ma), though the majority of ages range between 100 and 400 Ma, with four main peak ages clustering around 390–319, 286–264, 193, and 105 Ma. The Middle Permian (ca. 286–264 Ma) and earliest Miocene (22.9 ± 0.7 Ma) ages are constrained from a thermobarometric point of view: The former ages represent the formation of the zircons at depth (higher pressure), and the latter ages represent the exhumation process (lower pressure). Combining these petrological results with previous geophysical and geodynamical studies from the literature in the area, we propose a four-step geodynamic model for the Beni Bousera orogenic peridotite since the end of the Paleozoic (i.e., Middle Permian) to the present, supporting an evolution linked to a subduction-related scenario since Late Cretaceous times.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

GSA Special Papers

The Crust-Mantle and Lithosphere-Asthenosphere Boundaries: Insights from Xenoliths, Orogenic Deep Sections, and Geophysical Studies

Geological Society of America
Volume
526
ISBN print:
9780813725260
Publication date:
January 01, 2017

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

Related Articles
Related Book Content
This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now