Collaborative Research: Os, Nd and Hf isotopes in abyssal peridotites from Arctic Lena Trough: Continental lithospheric or asthenospheric mantle origin?

合作研究：北极勒拿海槽深海橄榄岩中的 Os、Nd 和 Hf 同位素：大陆岩石圈或软流圈地幔起源？

• 批准号: 0648409
• 负责人: John Lassiter
• 金额: --
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0648409&HistoricalAwards=false
• 关键词: Collaborative; Research; Os; Nd; Hf

(0648567/0648409 Snow/Lassiter)Intellectual Merit: This research seeks to use geochemical signatures in ultramafic ocean-basement rocks to understand the cause of continental breakups. Rocks collected on recent cruises to the Lena Trough, a young rift zone in the North Atlantic/Arctic separating the continental margins of European and North America will be analyzed and interpreted. Mineral separates from peridotitic mantle rocks from this amagmatic rift will be analyzed for the radiogenic isotopes Os, Re, Nd, and Hf to test whether there is an asthenospheric or continental lithospheric origin for the Lena Trough basement. If the rocks have a subcontinental source, the isotopes should show very low Os isotope ratios and scattered Nd and Hf values. Young asthenospheric origins will be reflected in uniformly young Nd and Hf model ages and Os isotopic compositions that match the average worldwide abyssal peridotite value.Broader Impacts: The project enhances the infrastructure for science by supporting new laboratories and equipment at two institutions. It also develops a new technique to measure Os isotopes via direct injection which improves on previous sparging methods. The work will expose undergraduates to research and train a graduate student. Efforts will be made to recruit try and recruit the graduate student from a group under-represented in the sciences.

（0648567/0648409雪/拉斯特）知识分子：本研究试图在超镁铁质的海洋销售岩石中使用地球化学签名来了解大陆分裂的原因。 岩石是在最近巡游到莉娜·沃尔（Lena Wold）的岩石上，这是北大西洋/北极地区的一个年轻裂谷区，将欧洲和北美大陆边缘分开的岩石将得到分析和解释。将分析从橄榄石岩石与这种杂乱无章的裂痕的矿物分离的放射性同位素OS，RE，ND和HF，以测试LENA槽基地的低磷酸或大陆岩石圈起源。 如果岩石具有次大源，同位素应显示出非常低的OS同位素比，并且散射的ND和HF值。 年轻的软圈起源将反映在统一的年轻ND和HF模型年龄和OS同位素组合物中，与全球平均深渊的陆地岩橄榄岩价值相匹配。BOADER的影响：该项目通过在两个机构的新实验室和设备支持新的实验室和设备来增强科学的基础设施。它还开发了一种新技术，可以通过直接注入来测量OS同位素，从而改善了先前的喷射方法。 这项工作将使本科生暴露于研究和培训研究生。 将努力招募尝试，并从科学中不足的小组中招募研究生。