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: 0426408
• 负责人: Douglas Wiens
• 金额: $ 53.5万
• 依托单位: Washington 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=0426408&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.

这是一个结合主动和被动地震实验沿着东刘扩展中心，以测试以下假设。1.地幔楔中的环流以板片驱动流为主。2.弧和弧后岩浆生产的相互作用通过影响熔体通量、岩石学和地球化学来控制脊的性质。3.地幔熔体供应的变化控制脊顶特征，如形态，热结构和热液喷口。被动实验由55个宽带海底地震仪和5个陆地地震仪组成，部署了10个月，对熔体产生区的大规模结构和地幔流动模式进行成像。主动震源实验由100个海底地震仪组成，这些地震仪沿着从膨胀的Vala Fa地区延伸到岩浆的250公里的扩张中心部分部署，在更广泛的意义上，这个实验解决了在一个独特的俯冲带设置中脊动力学的一阶问题，并且对于R2K的既定目标是必不可少的程序.研究生将得到所有四个PI的支持。