Petrología del plutón tardi- post-hercínico de Valdepeñas (Ciudad Real)

1. M. Carracedo Sánchez ¹
2. F. Sarrionandia ¹
3. J.F. Santos-Zalduegui ¹
4. S. García de Madinabeitia ¹
5. J. Errandonea ¹
6. J.I. Gil-Ibarguchi ¹

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Abstract

The pluton of Valdepeñas (Ciudad Real) is the easternmost outcrop of the Cáceres – Valdepeñas magmatic alignment (SE Central-Iberian Zone). The rocks at the outcrop are cordierite-bearing porphyric granites. The granites outcrop beneath the Cenozoic cover, in an area of 4 km2, without any visible relation with the Hercynian basement rocks. These granites are peraluminous (A/CNK= 1.10–1.22), magnesian [FeOT/(FeOT/MgO)≈ 0.76), and alkali-calcic [(Na2O+K2O)–CaO= 7.8–8.5]. The age of these granites (Zircon U-Pb) is 302.9 ± 2.5 Ma. InitialSr302.9Ma isotope ratios vary between 0.706 and 0.710, whereas Nd302.9Ma vary between -5.5 and -6.7. Elemental and isotopicgeochemical compositions of these S-type granites suggest that they were possibly generated by melting of metapelitic sources located in the middle-lower crust (granulite-facies conditions), induced by mantle derived melts during gravitational collapse of the Hercynian foldbelt

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