玢岩型铁矿床指在陆相安山质火山岩分布区与辉石闪长玢岩-次火山岩在空间、时间以及成因上联系的一组以铁为主的矿床，成矿方式以热液充填和交代为主。然而部分矿床发育厚大顺层产出的硫铁矿和硬石膏/石膏矿体，在矿体形态、矿石结构、矿物组合和围岩蚀变等方面与日本黑矿型VMS矿床具有很大的相似性，指示其可能形成于陆相火山湖环境，具有鲜明的成矿特色，此类矿床的形成环境仍缺乏详细研究，矿床成因是长期争议的科学问题。本项目选取其中代表性的庐枞盆地大鲍庄硫铁矿床，在详细的井下和钻孔野外地质研究的基础上，针对矿床中不同成矿阶段，不同类型的黄铁矿、硬石膏和碳酸盐等矿物进行SHRIMP原位碳氧硫同位素以及LA-ICP-MS微量元素分析，阐明矿床成因、物质来源和形成过程，并建立陆相火山环境块状硫化物矿床成矿模式。研究成果将推动玢岩型矿床成矿理论，为相似矿床寻找提供依据和指示，具有重要的理论价值和矿产勘查意义。

Porphyrite iron deposits refer to a group of iron deposits related to gabbro-diorite porphyrite subvolcanic rocks in space, time and genesis in the distribution area of andesite volcanic rocks. The ore-forming pattern is mainly hydrothermal filling and metasomatism. However, the pyrite and anhydrite / gypsum ore bodies developed in some of these deposits are very similar to Kuroko VMS deposits in terms of ore body shape, ore structure, mineral assemblage and wall rock alteration, indicating that they may be formed in continental volcanic lake environment with distinct metallogenic characteristics. The formation environment of such deposits is still lack of detailed study. The genesis of the deposits is a long debated scientific issue. In this project, the Dabaozhuang pyrite deposit in Luzong basin is selected. On the basis of detailed underground and drill hole geological research, SHRIMP in-situ carbon, oxygen and sulfur isotopes and LA-ICP-MS trace elements analysis are carried out for pyrite, anhydrite, carbonate and other minerals in different mineralization stages from the deposit to clarify the genesis, material source and formation process of the deposit, and built the metallogenic model of massive sulfide deposits in continental volcanic environment. The research results will promote the metallogenic theory of porphyrite type deposits, and provide indication for finding similar deposits, and have important theoretical value and mineral exploration significance.