Provenance of the Variscan Upper Allochthon (Cabo Ortegal Complex,NW Iberian Massif)



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Albert, R. and Arenas Martín, Ricardo and Gerdes, Axel and Sánchez Martínez, Sonia and Fernández-Suárez, J. and Fuenlabrada Pérez, José Manuel (2015) Provenance of the Variscan Upper Allochthon (Cabo Ortegal Complex,NW Iberian Massif). Gondwana Research, 28 (4). pp. 1434-1448. ISSN 1342-937X

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his study focuses on the provenance of the uppermost unit of the Upper Allochthon of the Variscan belt with
combined U–Pb and Lu–Hf zircon (LA-ICPMS) and Sm–Nd whole-rock analyses. This unit is represented in the
Cabo Ortegal Complex (NW Iberia) by the metasiliciclastic Cariño Gneisses which overlap ophiolitic units that
represent perigondwanan oceanic domains. The data set indicates a maximum depositional age of c. 510 Ma
and a c. 1.73 Ga Sm–Nd model age, typifying a late or post Pan-African (or Cadomian) and Eburnean events,
which entailed abundant input of juvenile material involving broad mixing with older crustal sources. The
Mesoproterozoic activity is scarce and scattered and therefore unlikely to represent a major crust generation
pulse in the source area of the siliciclastic unit. The data set also records an Archean orogenic pulse in its source
area followed by a long lasting crust reworking process, where the Eburnean juvenile materials intruded. These
data are interpreted asindicative of a WestAfrica Craton provenance, wherethe siliciclasticseries from whichthe
Cariño Gneisses are derived were probably deposited in a back-arc type basinwhere detritus wasmostly sourced
by the continent rather than the magmatic arc

Item Type:Article
Uncontrolled Keywords:Etrital zircons ; Provenance ; Isotope geochemistry ; Variscan Upper Allochthon ; Cabo Ortegal Complex
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:59836
Deposited On:31 Mar 2020 18:39
Last Modified:31 Mar 2020 18:39

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