Origin of the Pacific-Antarctic EPR and of its Large-Scale Segmentation

太平洋-南极洲EPR的起源及其大规模分割

• 批准号: 9314679
• 负责人: Peter Lonsdale
• 金额: $ 47.98万
• 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: 1994
• 资助国家: 美国
• 起止时间: 1994-01-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9314679&HistoricalAwards=false
• 关键词: Origin; Pacific; Antarctic; EPR; its

Lonsdale 9314679 A pair of marine geophysical surveys, on each margin of the Pacific-Antarctic East Pacific Rise, will establish how this rise lengthened by 2500 km during the Cenozoic, and how it produced major offsets which define the large-scale segmentation of the present spreading center. Existing data indicate that growth of the rise was by creation and capture of risecrest microplates, rifting of old oceanic lithosphere, and migration of triple junctions, so the project will include investigation of these processes. Principal survey tools will be a multibeam sonar, magnetometer, and single channel seismic profiler.

朗斯代尔9314679 在太平洋-南极东太平洋隆起的每一个边缘进行的一对海洋地球物理调查将确定这一隆起在新生代期间如何延长了2500公里，以及它如何产生主要的偏移，这些偏移定义了目前扩张中心的大规模分割。现有的数据表明，上升的增长是通过创建和捕获risecrest微板块，旧海洋岩石圈的裂谷，以及三重连接的迁移，因此该项目将包括这些过程的调查。 主要勘测工具将是多波束声纳、磁力计和单通道地震剖面仪。