Origin, Deformation and Composition of Mesozoic Oceanic Crust Entering the Tonga-Kermadec Trench

进入汤加-克马德克海沟的中生代洋壳的起源、变形和成分

• 批准号: 9731045
• 负责人: Peter Lonsdale
• 金额: $ 32.45万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-15 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9731045&HistoricalAwards=false
• 关键词: Origin; Deformation; Composition; Mesozoic; Oceanic

The proposed work will test the ideas about how oceanic lithosphere deforms as it enters the subduction zone and how its composition affects the magmatism of the adjacent volcanic arc. The investigators will undertake a magnetic and multibeam bathymetric survey and dredge rock samples from the outer bulge of Tonga-Kermadec Trench for geomorphological and geochemical analyses, respectively. This will allow them to sample young exposures of old oceanic crust rpoduced by faulting and study the sample young exposures of old oceanic crust produced by faulting and study the Mesozoic deformation. A 2000-km long and 80 km wide strip will be mapped by Seabeam 2000 and ca 20-30 dredge samples will be collected.

拟议的工作将测试有关海洋岩石圈如何变形，因为它进入俯冲带，以及它的组成如何影响邻近火山弧的岩浆活动的想法。 调查人员将进行磁力和多波束测深测量，并从汤加-Kermadec海沟的外隆部挖掘岩石样本，分别用于地貌和地球化学分析。 这将使他们能够对断层作用产生的古老洋壳的年轻出露部分进行取样，并研究断层作用产生的古老洋壳的年轻出露部分的样品，并研究中生代的变形。 Seabeam 2000将绘制一个2000 km长、80 km宽的条带，并将收集约20-30个疏浚样本。