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The Late Neoproterozoic magmatism in the Ediacaran series of the Eastern Pyrenees: new ages and isotope geochemistry

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Casas Tuset, Josep María and Navidad Fernández de la Cruz, Marina and Castiñeiras García, Pedro and Liesa Torre Marín, Montserrat and Aguilar, Carmen and Carreras, Jordi and Hofmann, Mandy and Gärtner, Andreas and Linnemann, Ulf (2015) The Late Neoproterozoic magmatism in the Ediacaran series of the Eastern Pyrenees: new ages and isotope geochemistry. International Journal of Earth Sciences, 104 (4). pp. 909-925. ISSN 1437-3254

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Official URL: http://link.springer.com/article/10.1007/s00531-014-1127-1



Abstract

Geochronological U–Pb (LA-ICP-MS), geochemical and isotopic data from metavolcanic felsic rocks of the Canigó and Cap de Creus massifs in the Eastern Pyrenees provide evidence of an Ediacaran magmatic event lasting 30 Ma in NE Iberia. These data also constrain the age of the Late Neoproterozoic succession in the Cap de Creus massif, where depositional ages range from 577 to 558 Ma, and in the Canigó massif, where the data (575–568 Ma) represent minimum ages. The geochemistry of the felsic rocks indicates that they were formed in a backarc environment and they record a fragment of a longlived subduction-related magmatic arc (620–520 Ma) in the active northern Gondwana margin. The homogeneity
shown by all these crustal fragments along this margin suggests that the individualization of the Pyrenean basement
from the Iberian Massif started later, probably during its
transition from an active to a passive margin in Cambro–
Ordovician times.


Item Type:Article
Uncontrolled Keywords:Ediacaran magmatism, Pyrenees, Cadomian, U–Pb zircon geochronology, Sr–Nd isotopes
Subjects:Sciences > Geology
Sciences > Geology > Geochemistry
ID Code:41755
Deposited On:11 May 2017 11:47
Last Modified:11 May 2017 11:47

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