赣西宜春-新余地区金矿床成矿规律与成矿模式OA

The tectonic position of the Yichun-Xinyu area in western Jiangxi is located at the southwestern end of the Pingle depression in the northeastern segment of the Qinhang junction zone.The region exhibits intense tectonic activity and magmatic activity,with superior geological conditions for gold mineralization.Currently discovered gold deposits in the area are predominantly small to medium-sized and exhibit diverse types,moreover,the ore de-posits exhibit diverse types.Research on metallogenic processes and ore-forming regularities is crucial for advanc-ing regional gold mineralization theory and achieving exploration breakthroughs.Building on previous studies,this research conducted systematic field investigations focusing on multiple geological bodies,multiple ore-hos-ting strata,and tectonic controls on mineralization.Different types of typical deposits were analyzed to clarify the characteristics of gold mineralization and its controlling factors,summarize ore-forming regularities,and estab-lish a metallogenic model.Research has shown that the main mineralization period of gold in the region is the In-dosinian or Yanshanian period.The ore-forming materials and fluids of gold deposits exhibit multi-source charac-teristics.The ore-forming materials of quartz vein type gold deposits mainly come from magma,and some come from metamorphic basement strata.The ore-forming materials of altered rock type gold deposits mainly come from magma,while some surrounding strata add ore-forming materials such as sulfur and gold.The ore-forming materials of micro disseminated gold deposits mainly come from the gold bearing strata in the basement and cap rocks.In terms of ore-forming fluids,quartz vein type gold deposits are mainly composed of magmatic hydrother-mal fluids,with atmospheric precipitation mixed in during the late stage.The main source of altered rock type gold deposits is magmatic hydrothermal fluids.Micro disseminated gold deposits exhibit a mixed acidic fluid mainly composed of atmospheric precipitation and a small amount of magmatic water.Based on these findings,the author proposed a new metallogenic model for the Yichun-Xinyu region,characterized by"multiple types,multiple stages,and multi-source fluids"in gold mineralization.