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

皮科利和坎德拉将研究砷和铋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成分鲜为人知，但在斑岩矿床中，它们是重要的探路元素--用于确定潜在开采目标的元素。为此，PIS将进行两种类型的实验：1)在100兆帕和800摄氏度下，砷和铋在长英质熔体与KCl-NaC l-HCl+/-硫化物卤水和蒸汽之间的分配实验(一些实验将在硫化物饱和系统中进行)；2)在密封的硅胶管中进行1000摄氏度的实验，以确定砷和铋在磁黄铁矿和Fe-S-O熔体之间的分配。Piccoli和Candela正在收集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，也可作为斑岩矿床的勘探模式。这项研究将包括高中、本科生、硕士和博士生，研究生将在很大程度上参与指导我们研究团队中更多的初级成员。此外，我们的研究团队将带头(并突出我们的研究)我们部门为春季大学开放日所做的努力，这一活动通常会吸引当地社区的60,000人来到马里兰大学校园。

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.