U-Pb chronometry of polymetamorphic high-pressure granulites: An example from the allochthonous terranes of the NW Iberian Variscan belt
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Published:January 01, 2007
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J. Fernández-Suárez, R. Arenas, J. Abati, J.R. Martínez Catalán, M.J. Whitehouse, T.E. Jeffries, 2007. "U-Pb chronometry of polymetamorphic high-pressure granulites: An example from the allochthonous terranes of the NW Iberian Variscan belt", 4-D Framework of Continental Crust, Robert D. Hatcher, Jr., Marvin P. Carlson, John H. McBride, José R. Martínez Catalán
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Secondary ion mass spectrometry (SIMS) U-Pb geochronology of zircons from high-pressure granulite units within the allochthonous complexes of the northwestern Iberian Variscan belt illustrates the complexity of dating high-pressure events using the U-Pb chronometer. Zircons from four rocks belonging to the high-pressure (P), high-temperature (T) units were dated by SIMS. A gabbro body with preserved igneous texture within the Órdenes Complex high-P granulites yielded a crystallization age of ca. 515 Ma. A high-P mafic granulite within the same unit contained zircons that had U-Pb ages clustered around 387 Ma, and it preserved no record...
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4-D Framework of Continental Crust

GeoRef
- absolute age
- Ar/Ar
- Baltica
- Cabo Ortegal Complex
- Cambrian
- dates
- Europe
- gabbros
- Galicia Spain
- granulites
- high pressure
- high-grade metamorphism
- Iapetus
- Iberian Massif
- Iberian Peninsula
- igneous rocks
- ion probe data
- Laurentia
- lithostratigraphy
- mafic composition
- mass spectra
- metamorphic rocks
- metamorphism
- nesosilicates
- ophiolite
- Ordenes Complex
- orthosilicates
- Paleozoic
- plutonic rocks
- pressure
- Rheic Ocean
- silicates
- Southern Europe
- Spain
- spectra
- U/Pb
- Upper Cambrian
- Variscides
- zircon
- zircon group
- Espasante Unit
- Moeche Unit
- Cedeira Unit
- Pena Escrita Unit
- Carino Unit
- Capelada Unit
- Purrido Unit
- Somozas Melange