| 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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| 引用本文：李曙光,陈移之,宋明春,张志敏,杨淳,赵敦敏.1994.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[J].地球学报,15(1,2):37-42. |
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| 基金项目:国家自然科学基金 |
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| 中文摘要:胶东海阳所胶南群斜长角闪岩中的锆石有2类：（1）捕掳晶锆石，它给出2149 Ma的￣(207) Pb/￣(206)Pb年龄，证明该区存在有早元古基底；（2）岩浆结晶锆石，它的不一致线上下交点年龄分别为1784±11Ma和448±13 Ma。然而该锆石在晋宁期和印支期曾发生2次铅丢失事件，从而使其下文点年龄（448±13 Ma）无地质意义．其上交点年龄指示了该锆石的最小结晶时代，它表明在18亿年时该地区曾有一次玄武质火山岩事件。 |
| 中文关键词:锆石U－Pb定年，斜长角闪岩，胶东海阳所 |
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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 |
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| Abstract: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. |
| keywords:U-Pb zircon ages amphibolite Haiyangsuo eastern Shandong Province |
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