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在研究和介绍湖南芙蓉锡矿矿床地质特征的基础上 ,对云英岩型锡矿石中的白云母和与成矿有关的骑田岭角闪黑云花岗岩中的黑云母进行了40 Ar_3 9Ar年龄测定 ,获得角闪黑云花岗岩的坪年龄为 (1 5 7.5± 0 .3)Ma;三门云英岩锡矿石的坪年龄为 (1 5 6 .1± 0 .4 )Ma ;淘洗窝云英岩锡矿石的坪年龄 (1 6 0 .1± 0 .9)Ma。这 3组测年数据很一致 ,不仅精确地反应出成岩成矿的时间限制 ,而且表明了花岗岩成岩与锡矿成矿的密切关系。此外 ,三组数据坪年龄一致显示出 ,在成岩成矿之后矿体未受到后期热事件的扰动。芙蓉锡矿床是湘南大型钨锡多金属矿集区的组成部分 ,也是华南地区中生代钨锡成矿两大高峰期之一的 1 6 0～ 1 35Ma期间形成的代表性矿床 ,可能为中国东部地球动力学体制调整时晚期岩石圈减薄过程中的产物
Based on the study and introduction of the geological characteristics of Fuyin tin deposit in Hunan Province, the biotite in muscovite-type tin ore and the biotite in Qitianling hornblende biotite granite related to ore-forming were studied by 40Ar-39Ar age The dating age of the hornblendellite granites was (15.5 ± 0.3) Ma. The plateau age of the tin-quartzite in Sanmen was (165 ± 1.04) Ma. Yunyingyan tin ore Ping age (160 ± 1.09) Ma. These three sets of dating data are consistent, not only accurately reflect the time limit of diagenetic mineralization, but also shows the close relationship between granite diagenesis and tin mineralization. In addition, the three data sets show that the ore body is not disturbed by late thermal events after diagenetic mineralization. The Furong Tin deposit is a component of the large tungsten-tin-polymetallic ore district in southern Hunan and also a representative mineral deposit formed during the period of 160 ~ 135 Ma which is one of the two peak periods of Mesozoic tungsten-tin mineralization in southern China. The product of the late lithosphere thinning in the adjustment of dynamical system