摘要
辽宁西部是我国钼矿资源的主要矿产地。作者根据30个K—Ar同位素年龄和一条Rb—Sr等时线年龄讨论了兰家沟钼矿区两种主要类型花岗岩和钼矿化的时代。研究表明,分布广泛的似斑状中粗粒花岗岩K—Ar年龄为219—188Ma,与钼矿化有密切关系的似斑状细粒花岗岩Rb—Sr等时线年龄为154Ma,K—Ar等时线年龄为152Ma。根据与钼矿化关系最密切的钾化细粒花岗岩、云英岩化花岗岩和石英斑岩的年龄,认为钼矿化富集时代为148—60Ma,作者还运用辉钼矿的Re、Os的化学分析数据,计算了Re—Os年龄,其年龄值为180Ma,与中粗粒似斑状花岗岩年龄相近。
W.Liaoning is the main place of molybdenum deposit resources in our country. According to the age of 30 K-Ar isotopes and a Rb-Sr isochron,studies on the two major types of granite and the age of molybdenum mineralize in molybdenum deposit of Lanjiagou,show that K-Ar isotope age of widely distributed porphyroid medium- coarse granite is 219-188Ma;Rb-Sr isochron age of porphyroid fine granite most closely related with molybdenum mineralize is 154Ma,K-Ar isochron age is 152Ma. According to the age of potassic-altered fine granite,greisenization granite and quartz-porphyry,the time of molybdenum mineralization is 148-60Ma.Re-Os age is calculated to be 180Ma by the author using the chemical analysis data of Re,Os in molybdenite,similar to porphyroid medium-coarse granite.
出处
《国土资源》
1989年第4期312-320,共9页
Land & Resources
