The Isotopic Distribution of Hafnium in Seawater

康奈尔大学的一位研究人员计划测量从大西洋(北大西洋深水、北极中水、地中海外流水和修改的南极中间水和深水)和太平洋(赤道水、北极中水、北中太平洋水和海洋普通水)和太平洋(赤道水、北极中水、北中太平洋水和大洋普通水)采集的海水样品的Hf同位素组成(176Hf/177Hf)和EHF值(归一化为CHUR的Hf同位素组成，176Hf/177Hf比值为0.282772)。此外，PI将分析来自东太平洋隆起9‘N的热液流体和从纳斯卡板块收集的含金属沉积物。这些测量的目的是对这种元素的地球化学提供新的见解，并确定铁锰结壳确实记录了海水中的氢的成分。如果铁锰结壳记录了海水Hf的浓度，那么PI认为Hf的同位素组成可以作为风化强度的古指示器。

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.