ORE-CONTROLLING CONDITIONS OF THE VEIN-TYPE LEAD-ZINC DEPOSITS IN THE CRETACEOUS RED BEDS IN FENGHUANG-MAYANG AREA IN THE SOUTHWEST EDGE OF YUANMA BASIN

The Yuanma basin is a Mesozoic fault basin, with many lead and zinc mineralized occurrences in the western edge. The deposits are in vein type hosted in the sandstone-conglomerate of Cretaceous red beds, in large size, with high grade and easily dressing and smelting ores. The characteristics of the deposits and ore-controlling conditions are analyzed. It is significant for the mineral exploration in the area.