摘要
武当地块是卷入南秦岭构造带的前震旦纪基底岩块，该基底岩块中广泛发育变形变质的基性岩墙群，获得岩墙群的ＳｍＮｄ全岩等时年龄为ｔ＝７８２±１６４（２σ）Ｍａ，ＩＮｄ＝０．５１１７１±１６（２σ），εＮｄ（ｔ）＝＋１．５±１．０。据此并综合区域地质实际，对南秦岭元古代古陆块的存在及其裂解等相关问题进行了讨论。
The Wudang Block is a Presinian basement block involved in the South Qinling belt,in which a large number of deformed and metamorphosed basic dykes are widely developed.We have determined isochron dating of Sm Nd whole rock: t =782±164(2σ)Ma, I Nd =0.51171±164(2σ),ΣNd( t )=+1.5±1.0.Besed on the result,the questions related to basement signature of South Qinling and rifting of ancient continental block in Neoproterozic,character are also discussed with original geology.
基金
国家自然科学基金
关键词
武当地块
基性岩墙群
钐
钕
同位素测年
South Qinling Wudang block basic dyke swarm Sm Nd dating
