湖南骑田岭岩体东缘菜岭岩体的锆石SHRIMP定年及其意义

基金项目: 中国地质调查局基础地质综合研究项目（200113900018）和宜昌地质矿产研究所科技发展基金(K200302)资助。

Zircon SHRIMP dating of the Cailing granite on the eastern margin of the Qitianling granite, Hunan, South China, and its significance

1.
China University of Geosciences, Wuhan 430074, Hubei, China
2.
Yichang Institute of Geology and Mineral Resources, Yichang 443003, Hubei, China

摘要: 提要：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。
- 菜岭花岗岩 /
- SHRIMP /
- 锆石 /
- 燕山期 /
- 湖南
Abstract: Abstract：The Cailing granite on the eastern margin of the Qitianling granite was precisely dated at 160±2 Ma 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.
- Cailing granite /
- SHRIMP /
- zircon /
- Yanshanian /
- Hunan