Geochemical characterization of the fire-fountain fed deposits of Las Herrerías volcano (Campo de Calatrava Volcanic Field, Ciudad Real)
DOI:
https://doi.org/10.3989/egeol.41726.317Keywords:
Geochemistry, spatter, melanephelinite, fire-fountain, Las Herrerías, CalatravaAbstract
The Las Herrerías volcano (Bolaños de Calatrava, Campo de Calatrava Volcanic Field) is characterized by the great amount and variety of fire-fountain fed deposits. All these deposits are compositionally similar, being constituted by magnesium-rich (MgO = 11.58–4.19%), aluminium-poor (Al₂O₃ = 9.64–10.99%) highly sodic (Na₂O = 2.24–3.81%) melanephelinites, with high contents in rare earth-elements (10x–200x chondrite), particularly in light-rare earth elements with respect to the heavy ones [(La/Lu)N = 32–35]. Contrary to the equivalent melanephelinites of this volcanic field, the relatively low contents in Ni (233–286 ppm), Cr (393–520 ppm) and magnesium number (Mg* = 45–54) indicate that these rocks do not correspond with primary melts. On the other hand, the variable distribution of clinopyroxene in the magma during eruption would be responsible for the slight compositional differences observed in the studied samples. Finally, we argue that these fire fountains were developed in a continental intraplate setting.
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