The late-Variscan peraluminous Valdepeñas pluton (southern Central Iberian Zone)

J. ERRANDONEA-MARTÍN, M. CARRACEDO-SÁNCHEZ, F. SARRIONANDIA, J.F. SANTOS ZALDUEGUI, S. GARCÍA DE MADINABEITIA, J.I. GIL-IBARGUCHI

Abstract


The Valdepeñas pluton is the easternmost outcrop of the Cáceres-Valdepeñas magmatic alignment (southern Central Iberian Zone). This massif is constituted by a cordierite-bearing porphyritic monzogranite and may be grouped within the so-called “Serie Mixta” granitoids. The Valdepeñas monzogranite is magnesian [FeOt/(FeOt/MgO)~0.76], alkali-calcic [(Na2O+K2O)–CaO=7.8–8.5] and peraluminous (A/CNK=1.14–1.20). Multielemental- and REE-normalized patterns are comparable to those of similar rocks in the Nisa-Alburquerque-Los Pedroches magmatic alignment and slightly differ from those of the Montes de Toledo batholith, both in the southern Central Iberian Zone. The U-Pb zircon age of 303±3Ma is consistent with a late-orogenic character of the intrusion and is in accordance with most of the granitic peraluminous intrusions of the southern Central Iberian Zone. 86Sr/87Sr300Ma ratios (0.707424–0.711253), eNd300Ma values (-5.53 to -6.68) and with whole-rock major and trace element compositions of the studied rocks, suggest that the parental magma for Valdepeñas monzogranite could derive from a crustal metaigneous source. The U-Pb ages (552–650Ma) of inherited zircon cores found in Valdepeñas monzogranite samples match those often found in Lower Paleozoic metavolcanics and granitic orthogneisses of Central Iberia, and furthermore point to Upper Neoproterozoic metaigneous basement rocks as most likely protoliths at the magma source. Based on the solubility of monazite in peraluminous melts, the estimated emplacement temperature for the studied monzogranite is in the range of 742–762ºC. The results obtained in this work would contribute to a better understanding of the currently matter of discussion on the origin of the “Serie Mixta” granitoids.

Keywords


monzogranite; peraluminous; metaigneous source; Central Iberian Zone; Valdepeñas

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DOI: http://dx.doi.org/10.1344/%25x

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Geologica Acta (ISSN-1695-6133)
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