Collaborative Research: High Field Strength Elements and Hf-Nd Isotope Systematics in Aleutian Lavas: Implications for Conservative Element Behavior in Subduction Zones

合作研究：阿留申熔岩中的高场强元素和 Hf-Nd 同位素系统学：对俯冲带保守元素行为的影响

• 批准号: 0230145
• 负责人: Gene Yogodzinski
• 金额: $ 13.9万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-01-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0230145&HistoricalAwards=false
• 关键词: Collaborative; Research; Field; Strength; Elements

Yogodzinski EAR-0230145This is a study of high field strength element (HFSE; Ti, Ta, Nb, Zr, Hf) and Lu-Hf isotopic systematics in volcanic rocks of the Aleutian island arc. The main objective of the study is to constrain the details of HFSE and related rare-earth element behavior in subduction zones. Specifically, the study will evaluate the conditions under-which HFSE behave conservatively versus non-conservatively during subduction magma genesis. High field strength element abundances and Hf-Nd isotopes will be measured in lavas collected from along the full length of the oceanic Aleutian arc. The analytical approach will involve (1) dissolution of samples in steel-jacketed Teflon vessels; (2) spiking of samples with a mixed 94Zr, 176Lu, 180Hf, 180Ta spike; (3) separation of elements of interest with ion-exchange chemistry; and (4) analysis of samples by isotope dilution on a multi-collector ICP mass spectrometer. This study will document along-arc and cross-arc changes in Aleutian HFSE and Hf isotope geochemistry. Well-documented changes in physical conditions along the arc, in particular the inferred relative temperature of the subducting plate and mantle wedge in the eastern versus western Aleutians, and the presence or absence of subducted sediment in the mantle source beneath different parts of the arc, will provide the geologic context for interpreting the observed HFSE and Hf isotopic variation.

Yogodzinski EAR-0230145这是一项研究高场强元素（HFSE; Ti，Ta，nb，Zr，HF）和Lu-HF同位素系统中的高田间强度元素。该研究的主要目的是限制俯冲带中HFSE和相关稀土元素行为的细节。具体而言，该研究将评估HFSE在俯冲岩浆起源期间保守与非保守的条件。高场强元素丰度和HF-ND同位素将在从海洋阿留申弧的全长沿熔岩中测量。分析方法将涉及（1）在钢制的特氟龙血管中溶解样品； （2）带有94ZR，176lu，180hf，180ta Spike的样品尖峰； （3）与离子交换化学分离感兴趣的要素； （4）通过同位素稀释仪上的样品分析多核心ICP质谱仪。这项研究将记录Aleutian HFSE和HF同位素地球化学的ARC和跨弧变化。有据可查的沿弧线的物理条件发生了充分记录的变化，尤其是在东部和西部阿勒列留岛的俯冲板和地幔楔的相对温度，以及在弧的不同部分下面的地幔源中存在或不存在俯冲沉积物，将提供地理环境，以解释相对的HFSE HFSE HFSE和HFSE ISOPOPOPIAPIC。