| 大别造山带北缘中生代地层格架厘定 |
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| 引用本文： | 李双应,岳书仓,王道轩,刘因,李任伟,孟庆任,金福全.大别造山带北缘中生代地层格架厘定[J].地层学杂志,2002,26(3):178-186,220. |
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| 作者姓名： | 李双应 岳书仓 王道轩 刘因 李任伟 孟庆任 金福全 |
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| 作者单位： | 1. 合肥工业大学资源与环境工程学院,安徽合肥,230009
2. 中国科学院地质与地球物理研究所,北京,100029 |
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| 基金项目： | 国家重点基础研究发展规划项目 (编号 :G19990 75 5 0 7)资助 |
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| 摘 要： | 大别山北麓陆相中生代地层发育 ,由于缺乏可靠生物化石证据 ,地层的划分和对比直到现在仍然存在巨大分歧 ,这制约了造山带研究的深入。根据对发现的火山岩碎屑和 K- Ar同位素年代学数据 (10 3.6— 138.3Ma)研究 ,表明凤凰山组、周公山组和毛坦厂组同属于早白垩世 ,并且可能是同期异相产物 ;覆盖在毛坦厂组之上的黑石渡组亦为早白垩世。根据地层接触关系、同位素年龄数据和岩相对比 ,三尖辅组以中侏罗世为主 ,可能跨早、晚侏罗世 ,与防虎山组和圆筒山组为同期异相。已有的石榴石重矿物分析和孢粉研究支持上述结论。地层接触关系表明白大畈组为早白垩世火山岩。
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| 关 键 词： | 火山碎屑 同位素年龄 中生代 地层格架 大别山北麓 安徽 |
| 文章编号： | 0253-4959(2002)03-0178-09 |
ON THE FRAMEWORK OF MESOZOIC STRATA ON THE NORTHERN MARGIN OF DABIE OROGENIC BELT |
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| LI Shuang ying ,YUE Shu cang ,WANG Dao xuan ,LIU Yin ,LI Ren wei ,MEN Qing ren ,and JIN Fu quan.ON THE FRAMEWORK OF MESOZOIC STRATA ON THE NORTHERN MARGIN OF DABIE OROGENIC BELT[J].Journal of Stratigraphy,2002,26(3):178-186,220. |
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| Authors: | LI Shuang ying YUE Shu cang WANG Dao xuan LIU Yin LI Ren wei MEN Qing ren and JIN Fu quan |
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| Abstract: | The continental Mesozoic strata on the northern margin of Dabei Orogenic Belt are well deve loped, but owing to the lack for convincing fossil evidence, the division and correlation of these strata have been a controversial subject for a long time. Thus, an intensive study of the orogenic belt has been limited. Studies of the debris of the discovered volcanic rocks and their characteristics as well as the K Ar isotopic geochronology show that the Fenghuangtai, Zhougongshan, and Maotanchang Formations all belong to the Early Cretaceous and are probably the heteropic contemporaneous products. The Heishidu Formation overlying the Maotanchang Formation is also Early Cretaceous in age. Based on the stratigraphic contact, isotopic dating, and lithofacies correlation, the Sanjianpu Formation is mostly of Middle Jurassic age and probadly straddles the Early Middle Jurassic and Middle Late Jurassic boundaries. The Sanjianpu Formation and the Yuantongshan Formation are contemporaneous and heteropic. The analyses of the garnets and the sporopollen support the conclusion mentioned above. The stratigraphic contact shows that the Baidafan Formation is volcanic rocks of Early Cretaceous age. |
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| Keywords: | volcaniclastic rock isotope age Mesozoic stratigraphic framework Dabieshan Anhui |
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