| 胶东海阳所斜长角闪岩的锆石U－Pb年龄──多期变质作用对锆石不一致线年龄影响的实例 |
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| 关键词:U-Pb zircon ages amphibolite Haiyangsuo eastern Shandong Province |
| 基金项目:国家自然科学基金 |
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| U-P6 ZIRCON AGES OF AMPHIBOLITE FROM THE HAIYANGSUO AREA,EASTERN SHANDONG PROVINCE──AN EXAMPLE FOR INFLUENCE OF MULTIMETAMORPHISM TO LOWER AND UPPER INTERCEPTS OF ZIRCON DISCORDIA LINE AT THE CONCORDIA CURVE |
| There are two kind of zircons in amphibolite from the Haiyangsuo area, eastern ShandongProvince:(1)Xenocrysts,they give ￣(207) Pb/￣(206)Pb age of 2149 Ma,which suggests an early proterozoicbasement in this area;(2)Magmatic euhedral zircons,they give an upper intercept age of 1784±11Ma and lower intercept age of 448±13 Ma.The lower intercept age of 448±13 Ma could be resultfrom two lead loss events during the Jinning(700-1000Ma)and Indosinian(190-245Ma)move-ments and have no geological significance.The upper intercept age indicats a low limit of crystal age ofthe zircons and suggests a basaltic volcanic event at 1.8 Ga ago in this area. |
| LI Shu-guang,CHEN Yi-zhi,SONG Ming-chun,ZHANG Zhi-min,YANG Chun,ZHAO Dun-min.1994.U-P6 ZIRCON AGES OF AMPHIBOLITE FROM THE HAIYANGSUO AREA,EASTERN SHANDONG PROVINCE──AN EXAMPLE FOR INFLUENCE OF MULTIMETAMORPHISM TO LOWER AND UPPER INTERCEPTS OF ZIRCON DISCORDIA LINE AT THE CONCORDIA CURVE[J].Acta Geoscientica Sinica,15(1,2):37-42. |
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