(1. 中南大学有色金属成矿预测教育部重点实验室，长沙 410083；
2. 中南大学地球科学与信息物理学院，长沙 410083；
3. 湖南省有色地质勘查局，长沙 410016)
摘 要: 对合江口矿的矿床地质特征，特别是岩相学和矿相学特征进行系统研究，并对该矿床中的辉钼矿进行Re-Os同位素测年，获得印支期(225±3.6Ma)成岩成矿作用的地质和年代学证据；结合以往的成岩成矿时代资料，认为锡田地区存在多期成矿事件，并讨论成矿动力学演化特征。结果表明：合江口矿床的第Ⅰ期成矿事件发生在印支期，成矿物质来源为壳幔混合源，发生于挤压大地构造背景中，矿化较弱；第Ⅱ期为燕山早期，在拉张的构造背景下，幔源物质大规模参与成矿，是本区的主成矿期；第Ⅲ期为燕山晚期，是与花岗斑岩脉侵入相关的斑岩-矽卡岩型矿体的成矿期，该期形成的矿体为锡田矿田内新发现类型，也是下一步的找矿方向之一。
关键字: 锡钨矿床；多期成矿作用；Re-Os同位素；合江口；锡田；钦杭带
（1. Key Laboratory of Metalloginic Prediction of Non-ferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Hunan Nonferrous Geological Exploration Bureau, Changsha 410016, China）
Abstract:Thegeology and mineralogy of the Hejiangkou deposit and conducted Re-Os isotopic dating on molybdenite from the Hejiangkou deposit were systematically studied. The dating results provided new evidence for the mineralization that occurred during the Indosinian (225±3.6Ma). By combining the rock-forming ages and mineralization ages obtained by both previous researches, the Xitian area experienced multi-periods mineralizations. Moreover, the metallogenetic tectonic settings of different mineralizations were also discussed. The results show that period I is the Indosinian mineralization period that involves mixing between both crust-derived and mantle-derived ore-forming materials. The period of mineralization took place under the compressional tectonic regime and featured by the weak mineralization. Period Ⅱis the early Yanshanian mineralization that represents the main mineralization period of the area and is related to a large influx of mantle-derived materials under an extensional regime. PeriodⅢ is the late Yanshanian porphyry-skarn type mineralization that is related to the emplacement of granite-porphyry veins and is a recently discovered type in the Xitian orefield. The porphyry-skarn type mineralization also becomes the target of the future ore-prospecting.
Key words: Sn-W deposit; multi-periods mineralization; Re-Os isotope; Hejiangkou; Xitian; Qinzhou-Hangzhou suture
