Collaborative Research: The Southeast Mariana Forearc Rifts and the Southernmost Mariana Trough Spreading Center: New Insights into the Tectonics and Magmatism of Intraoceanic Arcs

合作研究：东南马里亚纳弧前裂谷和最南端的马里亚纳海槽扩张中心：对洋内弧的构造和岩浆作用的新见解

• 批准号: 0961352
• 负责人: Robert Stern
• 金额: $ 20.02万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0961352&HistoricalAwards=false
• 关键词: Collaborative; Research; Southeast; Mariana; Forearc

Funds are provided for field work and subsequent lab study of the tectonic and magmatic evolution of an intraoceanic arc as characterized by the SE Marina Arc rifts (SEMFR) and southernmost Marina Trough spreading center. A combined deep-tow sidescan sonar and dredging/wax-coring cruise is planned to the region. The recent discovery of volcanism in the SEMFR suggests that mantle wedge asthenosphere has been drawn into the rifts and thus the PIs hope that their volcanic products may more directly reflect variations in slab fluxes and mantle melting associated with varying P-T conditions and breakdown of hydrous minerals in the underlying slab. The regional bathymetric and geophysical data synthesis will allow the PIs to kinematically model rift evolution.

资金提供的现场工作和随后的实验室研究的构造和岩浆演化的洋内弧的特点是东南滨海弧裂谷（SEMFR）和最南端的滨海槽扩张中心。计划对该区域进行深拖侧扫声纳和疏浚/蜡芯取样联合巡航。最近在SEMFR中发现的火山活动表明，地幔楔软流圈已被拉入裂谷，因此，PI希望他们的火山产物可能更直接地反映与不同的P-T条件和下伏板片中含水矿物的分解相关的板片通量和地幔熔融的变化。区域测深和地球物理数据的综合将使研究所能够对裂谷演化进行运动学建模。