Edad de cristalización magmática a partir de circones ígneos con un rango elevado de edades U-Pb concordantesDos ejemplos de la Sierra de Fiambalá (Sierras Pampeanas, Argentina)

  1. C. Casquet 1
  2. P. Castiñeiras 1
  3. P.H. Alasino 2
  4. J.A. Dahlquist 3
  5. E.g. Baldo 3
  1. 1 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  2. 2 Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja
  3. 3 Centro de Investigaciones en Ciencias de la Tierra
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2021

Issue Title: X Congreso Geológico de España

Issue: 18

Pages: 396-399

Type: Article

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Abstract

We have analyzed trace elements in zircon from two igneous samples collected in Sierra de Fiambalá, at Sierras Pampeanas, in NW Argentina. In both samples, a gabbronorite and a granodiorite, the obtained ages using SHRIMP did not yielded a conclusive result, as the concordant ages smeared between 20 and 80 m.y. Using zircon rare earth element composition, which is quite homogeneous in both samples, we can argue that the observed age variability is not caused by a large range of magmatic crystallization ages, but it is the result of lead loss. Accordingly, the age of these rocks should be calculated from the oldest set of concordant ages.

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