Geochemical and isotopic (Sr, Nd) constraints on the origin of the calc-alkaline syn-orogenic association from the Anatectic Complex of Toledo (Hercynian Iberian Belt)

  1. L. Barbero 1
  2. G. Rogers 2
  1. 1 Dpto Cristalografía, Mineralogía, Estratigrafía, Geodinámica, Petrología y Geoquímica, Fac. C. C. del Mar, Universidad de Cádiz
  2. 2 lsotope Geosciences Unit, SURRC, East Kilbride, Glasgow, United Kingdom

ISSN: 0213-683X

Year of publication: 1996

Issue: 20

Pages: 703-706

Type: Article

More publications in: Geogaceta


New chemical and isotopic (Sr, Nd ) data obtained far the syn-orogenic (pre-metamorphic clímax) shoshonitic affinity gabbros (Toledo type) and Argés calc-alkaline affinity granitoids indicate the presence of a marked isotopic heterogeneity. This contrasts with the other gabbroic series of the area (La Bastida gabbros) which in spite of the fact that they are spatially and temporal/y re/ated to the Toledo gabbros and the Argés granites, are isotopically homogeneous and have a more mantle-like signature. The shoshonitic affinity of the Toledo gabbros cou/d be produced by local-sea/e interaction with hydrothermal (magmatic?) fluids related to the Argés granites; this may a/so explain the presence of the isotopic heterogeneities in the Toledo gabbros and a/so in the intermediate members of the Argés series.