Sources and Cycling of Sulfur in Subduction Zones: The Geochemistry of Sulfur in the Mariana Island Arc, Trench andTrough

这个项目是为了确定马里亚纳弧和弧后海槽中新发现的海底玻璃和岩石的硫化物岩石学、硫含量和硫同位素组成。目的是评价这些岩石中硫的来源和汇，以研究俯冲大洋岩石圈和热液蚀变的弧前岩石在弧后盆地岩浆生成中的作用。这些数据还将有助于了解弧后背景下形成的块状硫化物矿床中硫的来源。%岩石成因的一个主要目标是了解在不同环境中产生的岩浆的来源物质。洋壳中的一个重要背景是弧后盆地。弧后盆地岩浆被认为是由两种不同的地幔来源混合而成。由于所建议的来源具有不同的硫同位素组成，它们在马里亚纳弧和弧后海槽岩石中的分析将为帮助厘清弧后盆地岩浆的来源提供基本的新数据。硫化物岩石学研究将有助于确定弧后盆地岩浆中硫的去向。

This is a project to determine the sulfide petrology, sulfur contents, and sulfur isotopic compositions of well documented fresh submarine glasses and rocks form the Mariana Arc and back arc trough. The goal is to evaluate the sources and sinks of sulfur in these rocks in order to investigate role of subducted oceanic lithosphere and hydrothermally altered fore arc rocks in the generation of back arc basin magmas. These data will also be useful for understanding the sources of sulfur in massive sulfide ore deposits formed in back arc settings. %%% A primary goal in petrogenesis is to understand the source materials of magmas that are produced in various settings. One important setting in the ocean crust is the back arc basin. Back arc basin magmas are thought to be derived from mixing of two different mantle sources. Because the suggested sources have different sulfur isotopic compositions, their analysis in the rocks from the Mariana Arc and back arc trough will provide fundamental new data to help sort out the sources of back arc basin magmas. A study of the sulfide petrology will help to determine the fate of sulfur in back arc basin magmas.