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Collaborative Research: Assessing Hotspot Fixity in the Pacific Basin

Collaborative Research: Assessing Hotspot Fixity in the Pacific Basin
合作研究:评估太平洋盆地的热点固定性
批准号:
0002875
负责人:
Robert Duncan
金额:
$11.55万
依托单位:
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
项目状态:
已结题
起止时间:
2001-01-15 至 2003-12-31

项目摘要

项目成果

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中文摘要
翻译
本研究将沿着Easter/Salas-y-Gomex/ Nazca(ESN)轨迹进行调查,以更好地描述和限制过去25 - 30 Ma热点的运动。 调查将涉及海山和火山脊的地质年代学、地球化学和地球物理研究。将利用多波束测深数据和反向散射图像确定选定地点的地形和结构特征,并确定疏浚目标。 采用~(40)Ar-~(39)Ar定年技术测定了疏浚物的岩石学、化学和Nd-Pb-Sr同位素特征。 新数据将与现有样本的重新分析相结合,以测试纳斯卡热点运动和地幔流模型,并将其与太平洋热点模型进行比较。
英文摘要
This study will conduct a survey along the Easter/Salas-y-Gomex/ Nazca (ESN) trail tobetter characterize and constrain movement of the hotspot over the last 25 to 30 Ma. The survey will involve geochronologic, geochemical, and geophysical study of seamounts and volcanic ridges. Multibeam bathymetric data and backscatter imagery will be used to define topography and structural features at selected localities and identify targets for dredging. Dredged samples will be dated using 40Ar-39Ar technique and their petrological, chemical and Nd-Pb-Sr isotopic chracteristics will be determined. The new data will be combined with re-analyses of existing samples to test Nazca-hotspot motion and mantle flow models and compare them to Pacific-hotspot models.
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