Enrichment of H2O and fluid-soluble trace elements in the Troodos Ophiolite: Evidence for a near-trench origin

Wölki D, Michael P, Regelous M, Haase K (2020)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2020

Journal

Lithos Elsevier

Book Volume: 356

Article Number: 105299

DOI: 10.1016/j.lithos.2019.105299

Abstract

The Troodos Ophiolite on the island of Cyprus is a Cretaceous supra-subduction zone ophiolite. It formed by seafloor spreading in the vicinity of a subduction zone, but the exact tectonic setting in which it formed is debated. We determined H2O contents together with other volatiles (S, Cl and CO2) and Sr, Nd and Pb isotope compositions of fresh Troodos volcanic glasses, previously measured for major and trace element contents. Glass compositions range from boninite to tholeiitic andesite. The least degassed glasses have H2O contents of 1.7 to 2.7 wt%, and H2O/Ce ratios of 4400 to 33,600. The most depleted glasses with low Zr/Yb have the highest fractionation-corrected H2O contents and H2O/Ce, and the highest subduction zone input (highest Th/La, Ba/Zr and Sr-87/Sr-86). The high H2O contents, enrichment in fluid-mobile elements, and depletion in Zr, Hf and heavy rare-earth elements are consistent with formation above a subduction zone, very close to a trench in a fore-arc position, likely at water depths of -5000 m. The enrichment in both fluid-mobile (e.g. Rb, Cs) and melt soluble (e.g. Th) elements indicate that the Troodos Ophiolite formed by propagation of a back-arc rift into the forearc region of an active subduction zone. (C) 2019 Elsevier B.V. All rights reserved.

Authors with CRIS profile

Dominic Wölki Lehrstuhl für Endogene Geodynamik (LEG) Marcel Regelous Geozentrum Nordbayern Karsten Haase Lehrstuhl für Endogene Geodynamik (LEG)

Related research project(s)

Tectonic origin of the Troodos Ophiolite from three-dimensional geochemical mapping of the lava pile Nov. 1, 2016 - Oct. 31, 2019

Involved external institutions

The University of Tulsa US United States (USA) (US)

How to cite

APA:

Wölki, D., Michael, P., Regelous, M., & Haase, K. (2020). Enrichment of H2O and fluid-soluble trace elements in the Troodos Ophiolite: Evidence for a near-trench origin. Lithos, 356. https://doi.org/10.1016/j.lithos.2019.105299

MLA:

Wölki, Dominic, et al. "Enrichment of H2O and fluid-soluble trace elements in the Troodos Ophiolite: Evidence for a near-trench origin." Lithos 356 (2020).

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