Mid-Cretaceous Tectonic Evolution of the Tongareva Triple Junction in the Southwest Pacific Basin

西南太平洋盆地汤加雷瓦三重交界处中白垩纪构造演化

• 批准号: 9818776
• 负责人: Roger Larson
• 金额: $ 16.02万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-03-15 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9818776&HistoricalAwards=false
• 关键词: Mid; Cretaceous; Tectonic; Evolution; Tongareva

This project will test a hypothesis for the mid-Cretaceous tectonic evolution of a portion of the southwest Pacific Basin. The hypothesis suggests that a plate-tectonic reorganization occurred soon after hotspot volcanism ceased on the Ontong Java and Manihiki plateaus, and the triple junction among the Pacific, Farallon, and Phoenix plates that had been located at the Nova Canton trough shifted to the northeast corner of the Manihiki plateau. A usrvey with multibeam bathymetric, side-scan, magnetometer, and shipboard and satellite gravity will determine the track of the triple junction.

该项目将检验一个关于西南太平洋盆地一部分的白垩纪中期构造演化的假设。 这一假说表明，板块构造重组发生后不久，热点火山活动停止Ontong Java和Manihiki高原，和太平洋，Farallon和凤凰板块之间的三重连接，一直位于新坎顿槽转移到东北角的Manihiki高原。 利用多波束测深仪、侧扫仪、磁力计、船载重力仪和卫星重力仪进行的一次调查将确定三重连接点的轨迹。