摘要
对骑田岭岩体主体仰天湖单元粗中粒斑状角闪石黑云母二长花岗岩进行了黑云母40Ar-39Ar年龄测定,获得坪年龄为(155.1±1.8)Ma,等时线年龄为(154.7±1.8)Ma。该年龄样品提高了骑田岭岩体形成时代的面上控制程度,与前人有关高精度年代资料一起说明骑田岭序列为中侏罗世末—晚侏罗世初形成的大岩基,基本排除其内部有其它时代成分的可能。结合骑田岭地区锡矿与花岗岩的关系,认为江口一带具有寻找锡矿的前景。
The biotitic ^40Ar-^39Ar dating was performed from the coarse-medium-grained hornblende biotite monzogranite of Yangtianhu unit in the Qitianling granite pluton. The result showed ^40Ar-^39Ar plateau age of 155.1± 1.8 M, and ^40Ar-^39Ar isochronal age of 154.7 ± 1.8 Ma. The data and other pervious ages indicate that Qitianling Sequence is a Middle Jurassic - Late Jurassic large pluton, and no other times bodies exist in Yangtianhu unit. On the relationships of the tin deposits and granites, the authors consider that there are good prospects for finding Sn deposits in Jiangkou area.
出处
《资源调查与环境》
2005年第3期179-184,共6页
Resources Survey & Environment
基金
中国地质调查局区域地质调查项目(200213000035)资助。
