Relación entre la hidratación/desvitrificación y el δO<sup>18</sup> en 1as rocas volcánica, neógenas del SE de España

J. López Ruiz; M. D. Wasserman

doi:10.3989/egeol.91471-2404

Relación entre la hidratación/desvitrificación y el δO¹⁸ en 1as rocas volcánica, neógenas del SE de España

Authors

J. López Ruiz Departamento de Geología. Museo Nacional de Ciencias Naturales (CSIC)
M. D. Wasserman U.S. Geological Survey. Denver Federal Center

DOI:

https://doi.org/10.3989/egeol.91471-2404

Keywords:

δO<sup>18</sup> values, calc-alkaline, shoshonitic and ultrapotassic rocks, hydration/devitrification

Abstract

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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Published

1991-04-30

How to Cite

López Ruiz, J., & Wasserman, M. D. (1991). Relación entre la hidratación/desvitrificación y el δO18 en 1as rocas volcánica, neógenas del SE de España. Estudios Geológicos, 47(1-2), 3–11. https://doi.org/10.3989/egeol.91471-2404

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Issue

Vol. 47 No. 1-2 (1991)

Section

Articles

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