Trace Element and Rare Earth Element (REE) Partitioning during Fluid-Mineral Equilibria at Elevated Temperatures andPressures

洋中脊温泉流体的微量元素和稀土元素化学取决于两个因素：1)流体流经的寄主岩石的组成；2)岩石和流体之间发生的化学交换。然而，为了使这些元素有助于了解海底热液系统中发生的岩石组成或化学变化，还需要了解很多关于原位条件下的矿物-流体平衡的知识。Drs。塞弗里德和伯恩特将进行实验室实验，模拟被认为存在于大洋中脊中的温度、压力、矿物和流体条件。目标是定量了解微量元素和稀土元素在矿物和热液流体之间分布的热力学基础。大部分工作将在明尼苏达大学进行，但涉及稀土元素分析的特殊技术将分包给Klinkhammer博士，他将在麻省理工学院进行这项工作。

Trace element and Rare Earth Element chemistry of hot spring fluids in mid-ocean ridges depends upon two factors: 1) the composition of the host rock through which these fluids flow; and 2) the chemical exchanges that occur between the rocks and the fluids. However, for these elements to be useful in gaining understanding of either rock composition or chemical alterations that occur in sub-seafloor hydrothermal systems, much has yet to be learned about mineral-fluid equilibria under in situ conditions. The Drs. Seyfried and Berndt will conduct lab experiments that duplicate the temperature, pressure, mineral and fluid conditions thought to exist within mid-ocean ridges. The goal is to gain a quantitative understanding of the thermodynamic basis for the distribution of trace elements and Rare Earth Elements between minerals and hydrothermal fluids. Most of the work will be conducted at the Univ. of Minnesota, but special techniques involving REE analysis is sub-contracted to Dr. Klinkhammer who will do the work at MIT.