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Relationships between syn-orogenic sedimentation and nappe emplacement in the hinterland of the Variscan belt in NW Iberia deduced from detrital zircons

Published online by Cambridge University Press:  10 June 2015

JOSÉ R. MARTÍNEZ CATALÁN ,
EMILIO GONZÁLEZ CLAVIJO ,
CARLOS MEIRELES ,
RUBÉN DÍEZ FERNÁNDEZ  and
JAMES BEVIS
JOSÉ R. MARTÍNEZ CATALÁN*
Affiliation:
Departamento de Geología, Universidad de Salamanca, 37008 Salamanca, Spain
EMILIO GONZÁLEZ CLAVIJO
Affiliation:
Instituto Geológico y Minero de España, Azafranal, 48, 37001 Salamanca, Spain
CARLOS MEIRELES
Affiliation:
Laboratório Nacional de Energia e Geologia (LNEG), Rua da Amieira, Apartado 1089, 4466–956 S. Mamede de Infesta, Portugal
RUBÉN DÍEZ FERNÁNDEZ
Affiliation:
Departamento de Petrología y Geoquímica and Instituto de Geociencias (UCM, CSIC), Universidad Complutense de Madrid, 28040 Madrid, Spain
JAMES BEVIS
Affiliation:
GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
*
†Author for correspondence: [email protected]
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Abstract

Flysch-type, syn-orogenic deposits of Carboniferous age occur in relation to the emplacement of a large allochthonous nappe stack in the Variscan belt of NW Iberia. New U–Pb age populations of detrital zircons obtained using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) are considered together with others from previously dated samples to establish the relationships between sedimentation and thrusting. The age populations of four syn-orogenic formations are compared with those of the pre-orogenic sequence in the Autochthon and Parautochthon, representing the Gondwanan passive margin, and in the Allochthon, formed by peri-Gondwanan and oceanic terranes. In addition, a new structural study has been carried out to understand the relationships between the syn-orogenic deposits and the development of Variscan structures. The aims are to identify the sources of sediments and to establish the relationship between Variscan structural evolution and syn-orogenic sedimentation. Development of a forebulge outwards from the allochthonous front, deduced from the structural study, suggests the existence of depocentres that hosted the syn-orogenic sediments. Together with the trend shown by the more recent zircons in each formation, that are younger towards the external zones, the data suggest that sedimentation occurred in progressively migrating depocentres formed in front of the allochthonous wedge during its emplacement. The zircon age populations point to the Allochthon as the main source of detritus for the syn-orogenic basins, with perhaps a limited participation of the Parautochthon and Autochthon in the younger formations.

Keywords

syn-orogenic depositsdetrital zircon agesnappe emplacementIberian MassifVariscan belt
Type
Original Articles
Information
Geological Magazine , Volume 153 , Issue 1 , January 2016 , pp. 38 - 60
Copyright
Copyright © Cambridge University Press 2015 

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