Investigation of blueschist and serpentinized harzburgite from the Mariana forearc: Insights into the mechanisms of element mobilization in subduction zones and storage of fluid-mobile elements in the mantle wedge

来自伊豆-波宁-马里亚纳（IBM）俯冲带前弧的蛇形泥火山是世界上唯一已知的从20公里深处的一个活跃俯冲带（直接来自板块-地幔界面）被运送到海底的样本。在蛇纹岩泥中发现了许多蛇纹岩化的哈尔茨布尔岩和蓝片岩相变质岩。利用高分辨率的原位地球化学分析，该项目试图研究这些样品，这些样品提供了关于俯冲过程的独特信息。特别是，该项目包括二次离子质谱（SIMS）和飞行时间(TOF)-SIMS，以确定精确的Li和B浓度，在10-30//m的尺度上进行0 B测量，以及分别以<\pm分辨率对上述元素进行元素映射。将这些技术与其他现代形式的分析相结合，应该有助于回答^m尺度的微量元素是如何包含在特别细粒度的矿物中。这一策略将有助于识别这些岩石中与特定结构相关的特定微量元素模式，从而反映特定的俯冲带过程。

The serpentine-mud volcanoes from the forearc of the Izu-Bonin-Mariana (IBM) subduction zone houses the only known samples worldwide that have been transported to the ocean floor from within an active subduction zone from a depth of 20 km (directly from the slab-mantle interface). Many serpentinized harzburgites and blueschist-facies metamafics are found within the serpentine-mud. Using high-resolution, in situ geochemical analysis, this project seeks to study these samples, which offer unique information about the subduction process. In particular, this project includes secondary ion mass spectrometry (SIMS) as well as Time-of-Flight (TOF)-SIMS, in order to ascertain accurate Li and B concentrations, 0 B-measurements at a scale of 10-30//m, as well as element-mapping of the above-mentioned elements with a <\pm resolution, respectively. Combining these techniques with other modern forms of analysis should help to answer how trace elements at the ^m scale are included in particularly fine-grained minerals. It is thought that this strategy will allow the recognition of specific trace element pattern associated with specific textures within these rocks, which reflect specific subduction zone processes.