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
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
中文摘要
含金属粘土、锰结核和结壳含有高放射性成因的Hf同位素,如果消减,Hf同位素可作为弧状熔岩中存在的示踪剂。这项拟议研究的目的是分析12个外侧俯冲系统的海洋沉积物中的Hf和ND同位素,以确定这一特征可能有多普遍。这种不寻常的Hf同位素分馏的来源也不确定,这些新数据将有助于限制其原因。最后,这些新的数据将有助于约束Hf和Nd同位素体系的地球物质平衡。这些样品将主要是从HF同位素变化可能很大的弧线和具有非常高沉积物通量的系统中获得的钻探过的沉积物。
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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