| 冀北滦平晚中生代火山碎屑（熔）岩中锆石SHRIMP U-Pb年龄及其地质意义 |
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| 引用本文： | 柳永清,李佩贤,田树刚.冀北滦平晚中生代火山碎屑（熔）岩中锆石SHRIMP U-Pb年龄及其地质意义[J].岩石矿物学杂志,2003,22(3):237-244. |
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| 作者姓名： | 柳永清 李佩贤 田树刚 |
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| 作者单位： | 中国地质科学院,地质研究所,北京,100037 |
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| 基金项目： | 国土资源部地质大调查资助项目 (DKD2 0 0 10 19)，国土资源部国际合作与科技司资助项目 (2 0 0 0 10 40 4) |
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| 摘 要： | 冀北滦平张家沟门村大北沟组上部首次发现凝灰岩和凝灰质砂岩层 ,其中单颗粒锆石SHRIMPU_Pb年龄为 133.9± 2 .5Ma、130 .1± 2 .5Ma,并新测得井上村东张家口组顶部流纹质强熔结凝灰岩单颗粒锆石SHRIMPU_Pb年龄为 135 .4± 1.6Ma。综合研究及对比表明 ,滦平盆地含热河生物群岩系层序较为齐全 ,热河生物群应萌发于135Ma ;大北沟组大店子组界线年代为 130Ma。该界线年代的确定有助于侏罗白垩系界线年代的研究。
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| 关 键 词： | 张家口组 大北沟组 大店子组 单颗粒锆石SHRIMP U—Pb年龄 热河生物群 滦平 冀北 |
| 文章编号： | 1000-6524(2003)03-0237-08 |
| 修稿时间： | 2003年2月25日 |
SHRIMP U-Pb zircon age of Late Mesozoic tuff(lava) in Luanping basin, northern Hebei, and its implications |
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| LIU Yong-qing,LI Peixian and TIAN Shu-gang.SHRIMP U-Pb zircon age of Late Mesozoic tuff(lava) in Luanping basin, northern Hebei, and its implications[J].Acta Petrologica Et Mineralogica,2003,22(3):237-244. |
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| Authors: | LIU Yong-qing LI Peixian and TIAN Shu-gang |
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| Abstract: | The recently discovered bedded tuff and tuffaceous sandstone within the Dabeigou Formation in Luanping basin of northernHebei were dated by SHRIMP zircon U-Pb technique at 133.9±2.5 Ma and 130.1±2.5 Ma respectively. The SHRIMP zircon U_Pb age of 135.4±1.6 Ma for the top tufflava of the Zhangjiagou Formation at eastern Jingshang Village was also obtained. A comprehensive study indicates that a complete Jehol biota_bearing succession is deposited in Luanping basin of northernHebei, and that 135 Ma is the lowest chronohorizon from which Jehol biota appeared. The authors hold that the boundary between Dabeigou Formation and
Dadianzi Formation is 130 Ma in age, the data is helpful to the study of the boundary between Jurassic and Cretaceous. |
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| Keywords: | Zhangjiakou Formation Dabeigou Formation Dadianzi Formation SHRIMP zircon U-Pb age Jehol biota Luanping northern Hebei |
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