For many years the genesis of the Broken Hill Pb-Zn-Ag deposit has been, and continues to be, hotly debated, mostly because many of the original characteristics of the deposit have been obscured by high-grade metamorphism and deformation. Metamorphism not only overprinted the deposit but fundamentally modified the sulfides through metamorphic remobilization. Based on experimental studies it had also been speculated that partial melting of the sulfides may have occurred. The lack of experimental data at elevated pressures in the PbS-FeS-ZnS system has limited this suggestion to mere speculation. We present the results of an experimental study of the melting behavior of sulfides, which show that Broken Hill ores must have been partially molten under peak metamorphic conditions.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址:北京市海淀区学院路29号 邮编:100083 电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700 |