A Hf and Nd-Isotope Study of Mantle Materials

这项研究有两个主要目标：1)确定橄榄岩中HF的耗竭年龄。对美国西部橄榄岩的系统研究是拟议的橄榄岩研究的重点，这将进一步限制这种HF耗尽组分的存在。2)结合NdHf同位素系统学估算熔融程度和深度。初步结果表明，熔体参数随主要元素的变化而变化。这项研究将进一步研究同位素熔体参数与主要元素变化之间的关系。这将表明，Hf和Nd同位素可以用来区分熔体生成和岩浆提取的模式。

This study has two main goals: 1) Determination of the age of Hf-depletions in peridotites. A systematic study of western US peridotites is the focus of the proposed peridotite study which will further constrain the existence through time of this Hf depleted component. 2) Estimation of the degree and depth of melting using the combined Nd and Hf-isotope systematics. Initial results show that melt parameters vary consistently with major element variations. This study will further examine the relationships between the isotopic melt parameters and the major element variations. It will be shown that Hf and Nd isotopes can thus be used to distinguish between models for melt generation and magma extraction.