岩矿测试Issue(6)：892-899,8.DOI:10.15898/j.cnki.11-2131/td.2014.06.021
LA－ICP－MS锆石U－Pb同位素定年：对闽北地区稻香组形成时代的制约
LA-ICP-MS Zircon U-Pb Isotopic Dating:Constraints on the Daoxiang Formation Age in North Fujian Province
摘要
Abstract
Although there is poor outcrop in the area,the Daoxiang formation exposed in North Fujian has unique rock assemblage and metamorphism,and deformation characteristics show that the Daoxiang group does exist,and belongs to metamorphic rock of the Cambrian period in previous research with Sm-Nd model age as (500 ±35 )Ma. However,the limitations of the test method,adversly influence the the reliability of the formation age.LA-ICP-MS U-Pb dating provides reliable and precise evidence of the formation age of the rocks.Zircon LA-ICP-MS U-Pb data of basalt and siliceous rocks carried out by this group show that the newest age of basalt is (1 1 1 .4 ±2.0)Ma,i.e. belonging to Early Cretaceous,which represents the lower limit of the formation age.The result is consistent with that of siliceous rocks,the newest of which is 1 24 Ma.The inherited zircon ages indicate proterozoic-paleozoic-mesozoic materials may be included in the source region,so the Daoxiang formation should be further disintegrated, the Vesicular basalt and Siliceous rocks which formed at Mesozoic should be separated from the Daoxiang formation. The discovery of all these ages enriches research work of tectonic evolution of Daoxiang formation and provides valuable data of the isotopic geochronological age.关键词
稻香组/硅质岩/玄武岩/LA-ICP-MS锆石U-Pb同位素定年/晚中生代早白垩世/闽北地区Key words
Daoxiang formation/siliceous rocks/basalts/LA-ICP-MS zircon U-Pb isotopic dating/Early Cretaceous/North Fujian Province分类
天文与地球科学引用本文复制引用
赵希林,余明刚,姜杨,李亚楠,靳国栋,陈志洪,邢光福..LA－ICP－MS锆石U－Pb同位素定年：对闽北地区稻香组形成时代的制约[J].岩矿测试,2014,(6):892-899,8.基金项目
中国地质调查局基础地质调查项目 （）
