CSEDI Collaborative Research: Experimental Study of Trace-Element Partitioning between the Core and Mantle

研究人员建议在加州大学伯克利分校的高压实验地球化学家和伍兹霍尔海洋研究所的分析地球化学家之间进行为期2年的合作研究。本研究将通过实验来评估在高压和高温下（~100 GPa和4000 K）的地球深部地幔和地核中金属和硅酸盐之间微量元素分配测量的可行性和有效性。 将评估将激光加热金刚石单元的能力与二次离子质谱法的能力相结合的可能性，激光加热金刚石单元用于再现行星内部的条件，二次离子质谱法用于在毫秒的空间尺度上测量ppm级及以下的同位素丰度。 如果成功的话，这些组合工具可以作为解决地球化学和地球物理学中主要问题的一种手段，这些问题取决于对地幔和地核内微量元素分布的了解。 这些研究对于确定地核和地幔之间的化学相互作用在地质时期的潜在后果至关重要，更广泛地说，对于破译地球深部内部的演变至关重要。 这里提出的实验是为了帮助开发方法的元素分区研究在未来进行。

Shimizu EAR-0112244The investigators propose to conduct a 2-year collaborative study between high-pressure experimental geophysicists at the University of California at Berkeley and analytical geochemists at Woods Hole Oceanographic Institution. This research will experimentally evaluate the feasibility and validate the measurement of trace-element partitioning between metal and silicate at the high pressures and temperatures of the Earth's deep mantle and core, ~100 GPa and 4000 K. The possibility of combining the capability of the laser-heated diamond cell, to reproduce conditions of the planetary interior, with that of secondary ion mass spectrometry (SIMS), for measuring isotopic abundances at the ppm level and below on spatial scales of ms, will be evaluated. If successful, these combined tools can be used as a means of resolving major issues in geochemistry and geophysics that depend on understanding the distribution of trace elements within the mantle and core. Such studies are crucial for determining the potential consequences of chemical interactions between the core and mantle over geological time and, more generally, for deciphering the evolution of the Earth's deep interior. The experiments proposed here are intended to help develop methodologies for element-partitioning studies to be pursued in the future.