Collaborative Research: Investigation of the Origin of Non-hotspot, Intraplate, Volcanic Ridges and Cross-Grain Gravity Lineations

合作研究：非热点、板内、火山脊和跨粒重力线的起源调查

• 批准号: 9911729
• 负责人: Donald Forsyth
• 金额: $ 47.11万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-05-01 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9911729&HistoricalAwards=false
• 关键词: Collaborative; Research; Investigation; Origin; Non

This project addresses the origin of intraplate volcanic ridges - often called cross-grain anomalies - located on the Pacific plate. Suggestions for the origin of these ridges include small-scale confection rolls, lithospheric boudinage, and small plumes resembling mini-hotspots that originate in the upper mantle. Two neighboring intraplate ridges will be studied. Measurements will include ocean-bottom seismometer observations of mantle structure, a seismic refraction/reflection profile of crustal structure, micro- earthquake recordings, extensive geochemical probing of the melting conditions and composition of the mantle, radiometric dating of the timing of volcanc activity, and mapping of bathymetry, seafloor sidescan reflectivity, sediment thickness, and gravity and magnetic anomalies.

该项目研究了位于太平洋板块的板内火山脊（通常称为交叉颗粒异常）的起源。 关于这些山脊起源的建议包括小规模的糖果卷、岩石圈布丁格和起源于上地幔的类似于迷你热点的小羽流。 将研究两个相邻的板内脊。 测量将包括地幔结构的海底地震仪观测、地壳结构的地震折射/反射剖面、微地震记录、对地幔熔化条件和成分的广泛地球化学探测、火山活动时间的放射性测年，以及测深、海底侧扫反射率、沉积物厚度以及重力和磁异常的绘图。