Relación entre la hidratación/desvitrificación y el δO18 en 1as rocas volcánica, neógenas del SE de España
DOI:
https://doi.org/10.3989/egeol.91471-2404Keywords:
δO<sup>18</sup> values, calc-alkaline, shoshonitic and ultrapotassic rocks, hydration/devitrificationAbstract
The high positive correlation (r = 0,94) between the δO18 values and the H2O content of the calc-alkaline (CA), high-K calc-alkaline (CAK), shoshonitic (SH) and ultrapotassic (UP) rocks from SE Spain, shows that the measured oxygen isotopic ratios are not primary but have been strongly modified by posteruptive hydration/devitrification processes. The ranges and means of corrected δO18 values for each rock group are as follows: CA = +8,6 to +10,2 ‰ (x = +9,4 ‰); CAK = +8,8 to +11,1 ‰ (x = +9,9 ‰; SH = +8,7 to + 11,0 ‰ (x = +9,6 ‰, y UP = + 10,2 to + 11,8 ‰ (x = + 10,8 ‰). These' values confirm the hypothesis that the lavas from SE Spain derive from a peridotitic mantle source highly contaminated (10-40 %) by melts released from subducted supracrustal material.
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