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Oxygen and hydrogen isotope studies of serpentinization in the Troodos ophiolite complex, Cyprus

Magaritz, Mordeckai and Taylor, Hugh P., Jr. (1974) Oxygen and hydrogen isotope studies of serpentinization in the Troodos ophiolite complex, Cyprus. Earth and Planetary Science Letters, 23 (1). pp. 8-14. ISSN 0012-821X. doi:10.1016/0012-821x(74)90023-5.

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Oxygen and hydrogen isotopic compositions were measured on 12 serpentine and 2 actinolite samples from the Troodos ophiolite complex, Cyprus. The single analyzed antigorite(δD= −60, δ18O= 7.1) is isotopically similar to all previously analyzed antigorites from ultramafic bodies. However, although their D/H ratios are relatively “normal”(δD= −70to−92), the δ18O values of most of the Troodos lizardite-chrysotile serpentines (+12.6 to +14.1) are much higher than the 2.0–9.3‰ range typically found in such serpentines. Such high δ18O values have previously been found only in the serpentine-like mineraloids termed “deweylites”, which apparently formed at Earth-surface temperatures, and in a single sample from Vourinos, Greece that is in contact with high-18O limestone. The Troodos lizardite-chrysotile samplescannot have formed by reaction with heated ocean waters, but instead must have formed in contact with large amounts of some type of meteoric, metamorphic, or formation water, either (1) at very low temperatures in a near-surface environment, or (2) at about 100°C from waters that were abnormally enriched in18O(δ18O ≈ +4 to +8). The latter possibility seems most plausible inasmuch as extensive evaporites were deposited throughout the Mediterranean Sea during the late Miocene, and this would have been accompanied by strong18O enrichments of the local meteoric waters. Heated ocean waters, however, probably were responsible for the formation of the actinolitic amphiboles(δ18O= 4.6 to 5.5; δD= −51to−46) from the gabbro and ultramafic zones in the Troodos complex. The amphiboles must have formed at considerably higher temperatures and at an earlier stage than the lizardite-chrysotile serpentinization.

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Additional Information:This work was financially supported by the National Science Foundation, Grant No. GA 30997X. Partial support for the field work and sample collecting by the Weizmann Institute, Rehovot, Israel is also gratefully acknowledged. We wish to thank S.M. Savin for a helpful review of the manuscript.
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NSFGA 30997X
Weizmann Institute of ScienceUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences2484
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Deposited By: Tony Diaz
Deposited On:07 Sep 2022 22:35
Last Modified:07 Sep 2022 22:35

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