| 滦平盆地大北沟组—大店子组沉积和地层格架及陆相层型意义 |
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| 关键词:Luanping basin Dabeigou-Dadianzi Formations the stratoframework terrestrial stratotype |
| 基金项目:中国地质科学院地质调查项目“中国地层标志化石及重点层型剖面”(No:DKD2001019) |
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| The Stratigraphic Framework of the Dabeigou-Dadianzi Formations in Luanping Basin, Northern Hebei and Its Stratotype Significance |
| A stratigraphic framework of Late Jurassic Dabeigou Formation and Early Cretaceous Dadianzi Formation has been set up recently on the basis of data obtained from facies analogy, fossil fauna and mark-beds of many sections in Luanping basin, northern Hebei. The stratigraphic framework is very important in recognizing the depression center of the basin and determining the stratotype sections, in addition to studying basinal development, tectonic conditions and volcanic activities. In the depositional period of the two formations, the basin was faulted down like a dustpan with the deeper part in the southwest. And from southwest to northeast, these sections gradually change in stratigraphic thickness, number of sedimentary cycles and facies sequences. The Zhangjiagou section discovered recently is situated at the deepest center of the basin. The Dabeigou-Dadianzi Formations in the section show a successive deposition and is characterized by mudstone, shale and siltstone interbedded with sandstone and conglomerate of semi-deep lake facies and deep lake facies in front of fan-shaped deltas. They have a large stratigraphic thickness (665 m) and consist of 5 big depositional cycles. Most of the cycles are composed of transitional facies sequences, i.e. the beach-lake facies, the fan-shaped delta facies, the fore-fan-shaped delta facies and the semi-deep lake and deep lake facies. Moreover, the section avoids the stratigraphic absence caused by volcanic eruptions and sedimentary interruptions resulting from erosion by the "Fengwoliang Conglomerate". So the Zhangjiagou section is an ideal candidate section for erecting the terrestrial stratotype and studying the Jurassic-Cretaceous boundary in China. |
| LIU Yong-qing,TIAN Shu-gang,LI Pei-xian,PANG Qi-qing,LI Yin.2001.The Stratigraphic Framework of the Dabeigou-Dadianzi Formations in Luanping Basin, Northern Hebei and Its Stratotype Significance[J].Acta Geoscientica Sinica,22(5):391-396. |
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