Correlación isotópica (Sm-Nd) entre las series Ediacáricas de Iberia y Bohemia

  1. E. Rojo-Pérez 1
  2. J.M. Fuenlabrada 1
  3. U. Linnemann 2
  4. R. Arenas 1
  5. S. Sánchez Martínez 1
  6. R. Díez Fernández 1
  7. L.M. Martín Parra 3
  8. J. Matas 3
  9. P. Andonaegui 1
  10. J. Fernández-Suárez 1
  1. 1 Univ. Complutense
  2. 2 Museum für Mineralogie und Geologie
  3. 3 Instituto Geológico y Minero de España
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    Instituto Geológico y Minero de España

    Madrid, España

    ROR https://ror.org/04cadha73

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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2021

Issue Title: X Congreso Geológico de España

Issue: 18

Pages: 453

Type: Article

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Abstract

The European Cadomian basement is characterized by the occurrence of large exposures of metasedimentary rock sequences with Late Ediacaran to Early Cambrian depositional ages. In the SW Iberian Massif this Cadomian basement is represented by the Serie Negra in the Ossa-Morena Complex. The Serie Negra is composed by two formations, which from older to youn- ger are the Montemolín Formation (c.600 Ma) and the Tentudía Formation (c. 565 Ma). The tectonic setting inferred from the geochemical features of these two Ediacaran formations suggests that sedimentation took place in a peri-arc environment (either a back-arc or a fore-arc basin), related to an active margin. The isotopic (Sm-Nd) results obtained for the metasedi- mentary rocks of the Serie Negra display a rather narrow range of ɛNd values comprised between -6.9 and -11.5, with TDM values ranging from 1.6 to 1.9 Ga. These results are comparable to those obtained for equivalent Ediacaran sedimentary series of the Cadomian basement in the North Bohemian Massif (Saxo-Thuringian Zone), which have TDM model ages ranging from 1.5 to 1.9 Ga, and ɛNd values ranging from -7 to -11. This very similar Sm-Nd isotopic signature between both realms suggests a deposition within a (large) shared peri-Gondwanan basin, filled with siliciclastic supplies derived from an old crustal source, likely located in the proximity of the West Africa Craton, with no apparent significant change in the source area until at least Early Cambrian times.

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