Collaborative Research: Crustal Accretion and Mantle Processes Along the Subduction-Influenced Eastern Lau Spreading Center

合作研究：受俯冲影响的东刘扩张中心的地壳增生和地幔过程

• 批准号: 0426369
• 负责人: Spahr Webb
• 金额: $ 42.05万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0426369&HistoricalAwards=false
• 关键词: Collaborative; Research; Crustal; Accretion; Mantle

Wiens et al.AbstractThis is a combined active and passive seismic experiment along the Eastern Lau Spreading Center to test the following hypotheses. 1. Circulation in the mantle wedge is dominated by slab driven flow. 2. Interaction of the arc and backarc magma production controls the character of the ridge by influencing melt flux, petrology, and geochemistry. 3. Variations in the mantle melt supply control ridge crest features such as morphology, thermal structure, and hydrothermal venting. The passive experiment consists of 55 broadband ocean bottom seismographs and five land seismographs deployed for 10 months to image the larger-scale structure of the melt production region and the mantle flow pattern. The active source experiment consists of 100 ocean bottom seismographs deployed along a 250 km section of the spreading center extending from the inflated Vala Fa region to the magma-starved northern Eastern Lau Spreading Center where the axial melt lens is absent.In broader terms this experiment addresses a first order problem in ridge dynamics in a unique subduction zone setting and is essential for the stated goals of R2K program. Graduate students will be supported by all four PIs.

维恩斯等人。摘要这是一次沿着东刘扩展中心的主动和被动地震联合实验，以检验以下假设。1.地幔楔内环流以板条驱动流为主。2.弧和弧后岩浆的相互作用通过影响熔体流量、岩石学和地球化学来控制隆起的性质。3.地幔熔体供应的变化控制了山脊的形态、热结构和热液喷发等特征。被动实验由55台宽带海底地震仪和5台陆地地震仪组成，部署了10个月，以成像熔体产生区的更大尺度结构和地幔流动模式。活动震源实验由100个海底地震仪组成，部署在从膨胀的瓦拉法地区延伸到缺乏岩浆的东北刘扩展中心的250公里范围内，那里没有轴向熔融透镜。更广泛地说，这个实验解决了独特俯冲带环境中的脊动力学的一阶问题，对于R2K计划所述的目标是必不可少的。研究生将得到所有四个私人助理的支持。