The Group 5A Pathfinder Elements: Experiments in Magma-Volatile Systems

Piccoli和Canadian将研究As和Bi在岩浆热液系统中的行为。这些元素在高温和中等压力下的化学性质知之甚少，但在斑岩矿床中，它们是重要的先导元素，用于确定潜在的采矿目标。为此，PI将进行两类实验：1）在100 MPa和800 oC下，As和Bi在长英质熔体与KCl-NaCl-HCl +/-硫化物盐水和蒸汽之间的分配实验（某些实验将在硫化物饱和系统中进行）; 2）在1000 ℃下，在密封的石英管中进行实验，以确定As和Bi在磁黄铁矿和Fe-S之间的分配。皮科利和坎尼正在收集关于As和Bi在地壳中行为的基本数据。这些数据可作为研究它们在地壳中再分布的基础，并可作为斑岩矿床的勘探模式。这项研究将涉及高中，本科，硕士和博士生在我们的研究混合，研究生将参与指导我们的研究团队的更多初级成员在很大程度上。此外，我们的研究团队将带头（并突出我们的研究）我们的部门在春季大学开放日的努力，这一事件通常吸引60，000人从当地社区到马里兰州校园大学。

Piccoli and Candela will study the behavior of As and Bi in magmatic hydrothermal systems. The chemistry of these elements at high temperature and moderate pressure is poorly known, yet in porphyry ore-deposits they serve as important pathfinder elements-elements used to determine potential targets for mining. To this end, the PIs will perform two types of experiments: 1) Experiments on the partitioning of As and Bi between felsic melts and KCl-NaCl-HCl +/-sulfide brine and vapor at 100 MPa and 800oC (some experiments will be performed in sulfide-saturated systems); 2) Experiments at 1000oC in sealed silica tubes to determine the partitioning of As and Bi between pyrrhotite and Fe-S-O melt.Piccoli and Candela are collecting fundamental data on the behavior of As and Bi in the crust of the Earth. These data can be used to serve as the basis for studies of their redistribution in the crust and serve as exploration models for porphyry deposits. This research will involve a mix of high school, undergraduate, masters and doctoral students in our research, and graduate students will participate to a large degree in mentoring more junior members of our research team. Additionally, our research team will spearhead (and highlight our research in) our departmental effort for a university open house in the spring, an event that typically draws 60,000 people to the University of Maryland Campus from the local community.