| 南岭东段燕山期镁铁质岩石Nd-Sr同位素研究及意义 |
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| 关键词:Mafic rocks Nd-Sr isotopes Yanshanian East Nanling region |
| 基金项目:核工业科学基金项目(编号:Y11218960401) |
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| Nd-Sr Isotopic Studies Of Yanshanian Mafic Rock in Eastern Nanling Region and Their Implications |
| The East Nanling′s Yanshanian mafic magma activity can be divided into four phase,namely Middle Jurassic,Late Jurassic,Early Cretaceous and Late Cretaceous,which are also four important episodes of extensional activities. The four phases mafic rocks have similar compositions,all characterised by high I _ Sr (commonly from 0.705 to 0.710) and wide variation range of ε_ Nd values ( from -7.90 to 5.16). This implies an origin of crust-mantle mixture.The mafic rock possess features of intraplate basalts,indicating that they are intraplate products and that in East Nanling region there existed a post-orogenic phase in the Middle Jurassic. The rock-forming model is as follows: When mafic magma rose to the crust bottom,it was contaminate by crustal materials,and rocks were formed in the setting of lithosphere extension and crustal extension. |
| ZHANG Shu-ming,WU Jian-hua,ZHOU Wei-xun.2004.Nd-Sr Isotopic Studies Of Yanshanian Mafic Rock in Eastern Nanling Region and Their Implications[J].Acta Geoscientica Sinica,25(2):248-254. |
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