Enrichment of H2O and fluid-soluble trace elements in the Troodos Ophiolite: Evidence for a near-trench origin
Enrichment of H2O and fluid-soluble trace elements in the Troodos Ophiolite: Evidence for a near-trench origin
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特罗多斯蛇绿岩中 H2O 和流体可溶性微量元素的富集:近海沟起源的证据
DOI:
10.1016/j.lithos.2019.105299
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发表时间:
2020
期刊:
影响因子:
3.5
通讯作者:
Regelous
中科院分区:
文献类型:
--
作者:
Woelki;Michael;Regelous
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 and87Sr/86Sr). 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 fore-arc region of an active subduction zone.
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影响因子:
5.3
作者:
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通讯作者:
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影响因子:
5.3
作者:
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Dominic Woelki;M. Regelous;K. Haase;R. H. Romer;C. Beier
DOI:
10.1029/2018gc007731
发表时间:
2019-01
期刊:
Geochemistry, Geophysics, Geosystems : G(3)
影响因子:
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影响因子:
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通讯作者:
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DOI:
--
发表时间:
2010
期刊:
影响因子:
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C. Macpherson;D. Hilton;K. Hammerschmidt
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