| 东秦岭陡岭群变质杂岩Sm-Nd、Rb-Sr、40Ar/39Ar、207Pb/206Pb年龄 |
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| 关键词:Douling Group isotopic data Qingling |
| 基金项目:国家自然科学基金 |
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| Sm Nd、Rb Sr、 40 Ar/ 39 Ar、 207 Pb/ 206 Pb Age of the Douling Metamorphic Complex from Eastern Qinling Orogenic Belt |
| The Douling metamorphic complex (the Douling Group) , situated in Eastern Qinlin gorogenic belt, the joint zone between the North China and the Yangtze plate, consists mainly of gneisses, Di leptites and amphibolites. The ages of the metamorphic rocks of the Douling Group have been measured by single zircon stepwise evaporation deposition for 207 Pb/ 206 Pbage investigations, Sm Nd, Rb Sr and 40 Ar/ 39 Ar methods. The isotopic data show that the Douling Group was formed in early Proterozoic (about 2 000 Ma). After its formation, the Douling Group was subjected to several strong metamorphism and thermal events. The Sm Nd isochron age (1 878±256 Ma, ε Nd (t) =+2.8±2.6) of the gneisses may represent the time of the first strong metamorphism. The main period of metamorphism occurred in Jinningian, 833 ±17 Ma ( 40 Ar/ 39 Ar high temperature plateau age of hornblende). The Rb Sr isochron age of the gneisses, 422±16 Ma, represent a metamorphism of Late Caledonian . In addition, there are a thermal event in Variscan, 323±8 Ma ( 40 Ar/ 39 Ar low temperature plateau age of the hornblende). The isotopic characteristic of the Douling Group is similar to that of the Qingling Group of the North China Plate and probably one part of the Qingling Group. |
| SHEN Jie,ZHANG Zong-qing,LIU Dun-yi.1997.Sm Nd、Rb Sr、 40 Ar/ 39 Ar、 207 Pb/ 206 Pb Age of the Douling Metamorphic Complex from Eastern Qinling Orogenic Belt[J].Acta Geoscientica Sinica,18(3):248-254. |
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