| 武当地块基性岩墙群的Sm-Nd定年及其相关问题讨论 |
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| 引用本文：周鼎武,张成立,刘良,王居里,刘颖宇,张宗清.1998.武当地块基性岩墙群的Sm-Nd定年及其相关问题讨论[J].地球学报,19(1):25-30. |
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| 基金项目:国家自然科学基金 |
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| 中文摘要: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Ｓｍ Ｎｄ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。 |
| 中文关键词:南秦岭 武当地块 基性岩墙群 Sm-Nd测年 |
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| Sm-Nd Dating of Basic Dykes from Wudang Block and a Discussion of Related-Questons |
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| Abstract: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. |
| keywords:South Qinling Wudang block basic dyke swarm Sm-Nd dating |
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