Preliminary results of isotopic analysis on continental carbonates in the Guadix Basin (Betic Cordillera, S. Spain)
- S. Pla-Pueyo 1
- I. Candy 1
- C. Viseras 2
- S. Henares 2
- 1 Dpt. Geography, Royal Holloway University of London
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2
Universidad de Granada
info
ISSN: 1576-5172
Datum der Publikation: 2012
Titel der Ausgabe: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Nummer: 13
Seiten: 707-710
Art: Artikel
Andere Publikationen in: Geotemas (Madrid)
Zusammenfassung
The first results from the isotopic analyses of 13C/12C and 18O/16O on the continental carbonates of the central sector of the Guadix Basin (Betic Cordillera, S. Spain) strengthen the previous sedimentologic interpretations of these materials. There is a high degree of scatter (r2 =0.32) between isotopic values for δ13C and δ18O in the case of calcretes and paleosol nodules, with average values of δ13C (mean= -7.24‰; range -9.01 to -5.19‰) and δ18O (mean= -6.79‰; range -9.28 to -4.33‰), indicating that both isotopes were controlled by different factors. Palustrine carbonates show a moderate correlation (r2 =0.51) between δ13C (mean= -7.51‰; range -4.77 to -8.85‰) and δ18O (mean= -6.86‰; range -8.60 to -4.82‰) values. Taking into account the available sedimentologic data, this correlation may be interpreted as the influence of evaporation in a wetland system developed on a floodplain, in which new water input would be determined by overflows of the axial fluvial system.