造山带中镁铁－超镁铁岩的不同定年方法简评──以闽北顺昌岩体为例  

Review on the Different Method of Dating Mafic-Ultramafic Rocks in the Orogenic Belt──Taking the Shunchang Massif as an Example

作　　者：任胜利[1] 孙敏[1] 李继亮[1] 周新华[1] 

机构地区：[1]中国地质大学地矿系,香港大学地质系,中国科学院地质所

出　　处：《福建地质》1996年第1期55-62,共8页Geology of Fujian

基　　金：国家自然科学基金

摘　　要：通过对不同同位素体系测年方法的分析，并结合闽北顺昌镁铁－超镁铁杂岩的系统同位素年代测定结果，提出造山带中变质镁铁－超镁铁岩的年代测定应以颗粒锆石Ｕ－Ｐｂ法和全岩Ｓｍ－Ｎｄ等时线法为主，对Ｒｂ－Ｓｒ、４０Ａｒ－３９Ａｒ和Ｋ－Ａｒ同位素测年结果的应用应持慎重态度。Based on the analysis of different dating methods of isotopic system and the dating results of the metumorphic mafic-ultramafic rocks in Shunchang, Northern Fujian, it's proposed in the paper that the U-Pb method of single zircon and the method of the whole-rock Sm-Nd isochronic age should be taken as the main ways for dating metamorphic mafic-ultramafic rocks in the orogenic belts. The discovery of younger ages dating with the Rb-Sr, 40Ar-39Ar and K-Ar methods suggests that caution is warranted in using these isotopic systems to date metumorphic mafic-ultramafic rocks.

关 键 词：同位素年代学 变质镁铁 超镁铁岩 造山带 岩体 

分 类 号：P588.242[天文地球—岩石学] P542.2[天文地球—地质学]