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Collaborative Research: Hf-Nd Isotopic and Trace-Element Geochemistry of Globally Subducting Sediments

Collaborative Research: Hf-Nd Isotopic and Trace-Element Geochemistry of Globally Subducting Sediments
合作研究:全球俯冲沉积物的 Hf-Nd 同位素和微量元素地球化学
批准号:
0137110
负责人:
Terry Plank
金额:
$6.73万
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
2002
资助国家:
美国
项目状态:
已结题
起止时间:
2002-03-15 至 2005-02-28

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中文摘要
翻译
含金属的粘土和锰结核和结壳含有高放射成因的Hf同位素,如果俯冲,Hf同位素可用作其存在于弧熔岩中的示踪剂。这项研究的目的是分析Hf和Nd同位素在海洋沉积物从外侧12俯冲系统,以确定如何普遍这种签名可能。这种不寻常的铪同位素分馏的起源也不确定,这些新的数据将有助于限制其原因。最后,新的数据将有助于约束Hf和Nd同位素系统的地球质量平衡。样品将主要是ODP钻探的沉积物,这些沉积物来自Hf同位素变化可能很大的弧和沉积物通量非常高的系统。
英文摘要
Metalliferous clays and Mn nodules and crusts contain highly radiogenic Hf isotopes and if subducted, the Hf isotopes could be used as a tracer for their presence in arc lavas. The purpose of this proposed study is to analyze Hf and Nd isotopes in marine sediments from outboard 12 subduction systems to determine how prevalent this signature might be. The origin of this unusual Hf isotopic fractionation is also uncertain, and these new data will help to constrain its cause. Finally, the new data will be helpful for constraining the terrestrial mass balance of Hf and Nd isotopic systems. The samples will mostly be ODP-drilled sediments obtained from arcs with potentially high variations of Hf isotopes and systems with very high sediment flux.
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