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
Regelous
中科院分区:
地球科学2区
文献类型:
--
作者:
Woelki;Michael;Regelous

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塞浦路斯岛上的Troodos蛇绿岩是白垩纪超俯冲带蛇绿岩。它是由俯冲带附近的海底扩张形成的,但它形成的确切构造环境尚有争议。我们测定了新鲜Troodos火山玻璃的H2O含量和其他挥发物(S, Cl和CO2)以及Sr, Nd和Pb同位素组成,之前测量了主要和微量元素的含量。玻璃成分从博宁岩到拉斑安山岩不等。脱气最少的玻璃的H2O含量为1.7 ~ 2.7 wt%, H2O/Ce比值为4400 ~ 33,600。低Zr/Yb的贫玻璃具有最高的分馏校正H2O含量和H2O/Ce,以及最高的俯冲带输入(最高的Th/La、Ba/Zr和87sr /86Sr)。高H2O含量,流体可动元素富集,Zr、Hf和重稀土元素富集,与俯冲带上方地层一致,非常靠近弧前位置的海沟,可能在水深~5000 m。流体可动元素(如Rb、Cs)和熔融可溶元素(如Th)的富集表明,Troodos蛇绿岩是由弧后裂谷传播到活动俯冲带的弧前区域形成的。
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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