Dataciones Rb/Sr en el complejo anatéctico de la Peña Negra (Batolito de Ávila, España central): evidencias de magmatismo pre-hercínico

  1. M.D. Pereira 1
  2. Y. Ronkin 2
  3. F. Bea 3
  1. 1 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

  2. 2 Zavaritsky Institute of Geology and Geochemistry
    info

    Zavaritsky Institute of Geology and Geochemistry

    Ekaterimburgo, Rusia

    ROR https://ror.org/03b1v3160

  3. 3 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

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Journal:
Revista de la Sociedad Geológica de España

ISSN: 0214-2708

Year of publication: 1992

Volume: 5

Issue: 1-2

Pages: 129-134

Type: Article

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More publications in: Revista de la Sociedad Geológica de España

Abstract

A Rb/Sr geochronologic study of the Peña Negra Anatectic Complex (CAPN) has allowed us: 1) To determine the minimum age of the CAPN protolith, made of migmatites and orthogneisses. It gives an age of 528 ± 14 m.a., with initial Sr87 /Sr86 = 0.7071; 2) To determine the age of subautochtonous granodiorites, anatectically developed from the above mentioned protolith. We have obtained an age of 310 ± 6 m.a. This value can also date the most intensive period of the migmatization and the second hercynian deformation phase, both being contemporaneous with the generation of granodiorites. Their initial Sr87 /Sr86 = O. 7096 supports the idea of a hybrid source composed of migmatites and orthogneisses. 3) To identify the existence of a prehercycian basic magmatism, obtaining a 416 ± 21 m.a. age with initial Sr87/Sr86 = 0.7051.

Data source: Dialnet