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A U-Pb Study of Zircons from a Lower Crustal Granulite Xenolith of the Spanish Central System: A Record of Iberian Lithospheric Evolution from the Neoproterozoic to the Triassic

Fernández Suárez, Javier and Arenas Martín, Ricardo and Jeffries, Teresa E. and Whitehouse, Martín J. and Villaseca González, Carlos (2006) A U-Pb Study of Zircons from a Lower Crustal Granulite Xenolith of the Spanish Central System: A Record of Iberian Lithospheric Evolution from the Neoproterozoic to the Triassic. The Journal of geology, 114 . pp. 471-483. ISSN 0022-1376

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Abstract

A U-Pb laser ablation inductively coupled plasma mass spectrometry and secondary ion mass spectrometry geochronological
study has been performed on zircons from a felsic granulite xenolith from the lower crust under the
Variscan belt of Iberia. The ages obtained reveal zircon-forming events that span from the late Neoproterozoic
(Cadomian-Avalonian orogeny) to the early stages of the opening of the Atlantic Ocean in the Mesozoic, through
Cambro-Ordovician rifting, Devono-Carboniferous Variscan-Alleghenian collision, and Permian-Triassic extension
and uplift. The U-Pb age groups found in zircons from this single lower crustal xenolith (ca. 220, 250, 280–310, 460–
490, 525, and 550–590 Ma) record at least one complete cycle of closing and opening of oceanic basins and collision
of continental masses. Zircons from the felsic granulite xenolith contain a synthesis of the geochronological information
found on the surface geology and record most but not all major lithospheric events in the region in a ca. 400-
m.yr. period.


Item Type:Article
Uncontrolled Keywords:U-Pb study; Zircons; Granulite; Spain; Geocronology
Subjects:Sciences > Geology > Geochemistry
ID Code:12369
Deposited On:07 Mar 2011 10:57
Last Modified:07 Mar 2011 10:57

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