The Isotopic Distribution of Hafnium in Seawater

海水中铪的同位素分布

• 批准号: 0117437
• 负责人: Linda Godfrey
• 金额: $ 12.03万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2001-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0117437&HistoricalAwards=false
• 关键词: Isotopic; Distribution; Hafnium; Seawater

ABSTRACTOCE-0117437A researcher from Cornell University plans to measure the hafnium (Hf) isotopic composition (176Hf/177Hf) and eHf values (isotopic composition of Hf normalized to CHUR, a chondrite with a 176Hf/177Hf ratio of 0.282772) of seawater samples recovered from both the Atlantic (North Atlantic Deep Water, Arctic Intermediate Water, Mediterranean Outflow Water and modified Antarctic Intermediate and Deep Water) and Pacific Ocean (Equatorial Water, Arctic Intermediate Water, North Central Pacific Water and Ocean Common Water). In addition, the PI will analyze hydrothermal fluids from 9'N on the East Pacific Rise and metalliferous sediments collected from the Nazca Plate. The goal of these measurements is to provide new insights into the geochemistry of this element and ascertain that ferromanganese crusts indeed record the composition of Hf in seawater. If ferromanganese crust record seawater Hf concentrations, then the PI contends that the isotopic composition of Hf can be used as a paleo indicator of weathering intensity.

康奈尔大学的一位研究人员计划测量铪（Hf）的同位素组成，（176 Hf/177 Hf）和eHf值（Hf的同位素组成标准化为CHUR，一种球粒陨石，176 Hf/177 Hf比值为0.282772）的海水样品从大西洋和（北大西洋深层水、北极中层水、地中海外流水和改良南极中层水和深层水）和太平洋（赤道水、北极中层水、中太平洋北部水和海洋共有水）。 此外，PI将分析东太平洋海隆北纬9度的热液流体和从纳斯卡板块收集的含金属沉积物。 这些测量的目的是提供新的见解，这种元素的地球化学，并确定铁锰结壳确实记录了海水中的铪的成分。 如果铁锰结壳记录海水Hf浓度，那么PI认为Hf的同位素组成可以用作风化强度的古指标。