The Geochemistry of Sulfur During Submarine Hydrothermal Alteration of the Troodos Ophiolite, Cyprus

海底热液系统中的海水-地壳反应 可能对质量和同位素产生重要影响 海水中的硫的组成，但这种影响已经 由于缺乏数据和对硫的了解， 这些系统。 蚀变洋壳的俯冲作用也被 建议解释弧火山岩的34 S富集， 在硫同位素组成中产生不均匀性， 地幔，但很少有人知道的分布或 蚀变洋壳硫同位素组成 是 建议分析硫化物矿物学，硫含量， 特罗多斯剖面的硫同位素组成 为了了解硫的地球化学 在海水-地壳反应期间，并解决这些问题。 建议的结果将提供一个必要的测试， 海底样品的结果。 此外，蛇绿岩剖面 将提供关于深反应/上流区的重要新数据， 这是海洋样品组所缺少的。 无核武器区 对热液的形成起到重要的控制作用 大量的硫化物沉积物并喷到海底。 的 拟议的研究还将允许测试理论模型 预测深部硫和34 S富集带 热液系统的补给区。 这些岩石还没有 从海底观察到的。

Seawater-crustal reactions in submarine hydrothermal systems may exert an important influence on the mass and isotopic composition of sulfur in seawater, but such effects have been ignored due to a lack of data and understanding of sulfur in these systems. Subduction of altered oceanic crust has also been suggested to account for the 34S-enrichments of arc volcanics and to produce heterogeneities in the sulfur isotopic composition of the mantle, but little is known about the distribution or isotopic composition of sulfur in altered oceanic crust. It is proposed to analyze the sulfide mineralogy, sulfur contents, and sulfur isotopic composition of a section through the Troodos ophiolite in order to understand the geochemistry of sulfur during seawater-crustal reactions and to address these problems. The proposed results will provide a necessary test of recent results from seafloor samples. Moreover, the ophiolite section will provide essential new data on deep reaction/upflow zones, which are lacking from the oceanic sample suite. Such zones exert important controls on hydrothermal fluids which form massive sulfide deposits and vent onto the seafloor. The proposed study will also permit testing of theoretical models which predict zones of sulfur and 34S enriched rocks in the deep recharge areas of hydrothermal systems. Such rocks have not yet been observed from the seafloor.