【摘要】 应用锆石SHRIMP方法对湖南骑田岭岩体东缘的“印支期”菜岭岩体进行了精确的SHRIMP定年研究。结果表明菜岭花岗岩的形成年龄为(160±2)Ma,从而确证它是燕山期花岗岩,且属于骑田岭岩体主侵入阶段的范畴。少量继承锆石核记录了中元古代的年龄信息,表明前寒武纪岩石可能是区内花岗岩浆熔融源区的重要组成之一。更多还原

【Abstract】 The Cailing granite on the eastern margin of the Qitianling granite was precisely dated at160 ± 2Ma using zircon SHRIMP,which suggests that the Cailing granite was intruded in the early Yanshanian,rather than in the Indosinian as is considered previously.A few inherited cores record Mesoproterozoic age information,which indicates that Precambrian rocks might be one of the important components in the granitic magma melting source region in the study area.更多还原