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High-18O igneous rocks from the Tuscan Magmatic Province, Italy

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Abstract

The 18O/16O ratios were measured for 60 rocks and coexisting minerals from the Plio-Pleistocene, calc-alkaline, Tuscan Magmatic Province, Italy. The δ18O values of these magmas were as follows: Elba, Giglio, and Montecristo granodiorites (11.4 to 12.1); M. Cimini rhyolites and trachytes (11.2 to 11.7); Roccastrada, S. Vincenzo, and M. Amiata rhyolites (12.3 to 13.4); and the Tolfa rhyolites and quartz latites (15.3 to 16.4). The latter are by far the highest δ18O values yet reported for primary volcanic rocks. The extremely high δ18O values in the Tuscan Province indicate that these magmas all formed by melting or large-scale assimilation of high-18O argillaceous sedimentary rocks, in agreement with previous evidence based on the high 87Sr/86Sr ratios and ubiquitous presence of cordierite. Low δ18O values (+5 to +6) were found in the feldspar, but not the quartz, of the small Porto Azzuro stock on Elba, as well as in the marginal facies of the M. Capanne stock, indicating that these bodies interacted with low-18O meteoric-hydrothermal fluids subsequent to solidification. The M. Cimini lavas apparently formed about 1 m.y. ago by mixing of high-18O Tuscan magmas containing large K feldspar crystals with potassic, undersaturated, low-18O magmas of the adjacent Roman Co-Magmatic Province. These large sanidine crystals did not completely equilibrate 18O/16O with the coexisting magma.

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Authors and Affiliations

  1. Division of Geological and Planetary Sciences, California Institute of Technology, 91125, Pasadena, California

    Hugh P. Taylor Jr.

  2. Institute di Geochimica, Universita di Roma, 00100, Rome, Italy

    Bruno Turi

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  1. Hugh P. Taylor Jr.
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  2. Bruno Turi
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Publication of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, Contribution Number 2639.

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Taylor, H.P., Turi, B. High-18O igneous rocks from the Tuscan Magmatic Province, Italy. Contr. Mineral. and Petrol. 55, 33–54 (1976). https://doi.org/10.1007/BF00372753

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