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

马里亚纳弧前蓝片岩和蛇纹石化方辉橄榄岩的研究：深入了解俯冲带中的元素动员机制以及地幔楔中流体移动元素的储存

• 批准号: 13164596
• 负责人: Professor Dr. Thomas Zack
• 金额: --
• 依托单位: Department of Earth Sciences
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/13164596?language=en
• 关键词: Investigation; blueschist; serpentinized; harzburgite; Mariana

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.

来自Izu-Bonin-Mariana(IBM)俯冲带前弧的蛇纹石-泥火山容纳了世界上唯一已知的从20公里深的活动俯冲带内(直接从板地幔界面)输送到海底的样品。在蛇纹岩泥中发现了许多蛇纹岩化的方辉橄榄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仪(SIMS)和飞行时间质谱仪(TOF-SIMS)，以确定准确的Li和B浓度，分别在10-30/m的尺度上进行0 B测量，以及以a&lt；\pm分辨率绘制上述元素的元素图。将这些技术与其他现代分析形式结合起来，应该有助于回答如何在特别细粒的矿物中包含^m级的微量元素。人们认为，这一策略将允许识别与这些岩石中特定结构相关的特定微量元素模式，这些模式反映了特定的俯冲带过程。