U-Pb geochronolgy of the deformed Juzbado Granite
(Salamanca, NW Spain)
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Publication date
2018
Authors
Gutiérrez Alonso, Gabriel
Jablonski, Jerónimo
Hofmann, Mandy
Gärtner, Andreas
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Publisher
Sociedad Geológica de España
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Abstract
Este trabajo se centra en el estudio de la edad de cristalización del granito deformado de Juzbado mediante geocronología U-Pb a través de ablación láser. Se dataron 7 granos de circón, obteniéndose edades comprendidas entre 340 y 2500 Ma. Los datos obtenidos proporcionan una edad máxima de cristalización de 340 Ma y aportan datos sobre la naturaleza de los potenciales materiales fuente. Las edades de circones heredados existentes en el granito son coincidentes con las encontradas en las posibles rocas fuente. Dado que esta intrusión está deformada intensamente por la fábrica relacionada con la Zona de Cizalla de Juzbado-Penalva do Castelo, la edad mínima de este cuerpo es de 308 Ma. La comparación de las características petrológicas de este granito con las de otros en los alrededores (en el Domo del Tormes) permite asignarle una edad en torno a 320 Ma.
This paper reports a study of the crystallization age of the deformed Juzbado Granite through LA-ICP-MS U-Pb geochronology. Seven zircon grains were dated providing ages ranging from 340 to 2500 Ma. The U-Pb age data supply a maximum crystallization age of 340 Ma and insights into the nature of potential source rocks. The ages of the inherited zircon grains or xenocrysts are in agreement with the zircon contents found in the potential source rocks. Given that the intrusion is deformed by the fabric related to the Juzbado-Penalva do Castelo shear zone, its minimum age must be ca. 308 Ma. Based on the petrological similarities with other granite bodies in the surrounding area (Tormes anatectic dome) its age is likely to be around 320 Ma.
This paper reports a study of the crystallization age of the deformed Juzbado Granite through LA-ICP-MS U-Pb geochronology. Seven zircon grains were dated providing ages ranging from 340 to 2500 Ma. The U-Pb age data supply a maximum crystallization age of 340 Ma and insights into the nature of potential source rocks. The ages of the inherited zircon grains or xenocrysts are in agreement with the zircon contents found in the potential source rocks. Given that the intrusion is deformed by the fabric related to the Juzbado-Penalva do Castelo shear zone, its minimum age must be ca. 308 Ma. Based on the petrological similarities with other granite bodies in the surrounding area (Tormes anatectic dome) its age is likely to be around 320 Ma.