湖南骑田岭白腊水锡矿床成矿年龄讨论

A Discussion on the Ore-forming Age of the Bailashui Tin Deposit in Qitianling,Hunan

白腊水锡矿是骑田岭地区最重要的矿床 ,在该矿床中又以夕卡岩化破碎带蚀变岩型锡矿为主。通过矿床成矿环境和矿区及外围岩 (矿 )石K Ar、锆石U Pb、Rb Sr等时线等和石英流体包裹体Rb Sr等时线年龄资料的讨论 ,认为该矿床的成矿作用发生的燕山早期 ,年龄资料显示至少有 2个成矿阶段 ;而且 19号矿脉的主成矿阶段可能早于 10号矿脉。

The Bailashui tin deposit,situated in southern Qitianling rock body of Hunan Province,is a large-size tin deposit discovered in recent years. It consists of forty tin ore veins of such types as the altered rock type of the skarnization fracture zone,the altered rock body type and the porphyry type. In the deposit,the skarnization fracture zone type (No.19 ore vein) is most important. Based on studies of the metallogenic environment of the deposit together with the K-Ar,zircon U-Pb and Rb-Sr age data of the metallogenic area and the Shizhuyuan mining area,it is held that the ore-forming process must have taken place in early Yanshanian period,and that there existed at least two ore-forming stages,with the formation of the No.19 ore vein earlier than that of the No.10 ore vein.