| Early Cretaceous Tectonism and Diatoms in Korea |
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| 作者姓名： | Ki-Hong CHANG Sun-Ok PARK |
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| 作者单位： | Department of Geology, Kyungpook National University, Daegu, Korea;Department of Geology, Kyungpook National University, Daegu, Korea |
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| 基金项目： | Acknowledgments This study aims at the stratigraphic identification of the Dabokni Formation bearing diatom fossils. The fossil identification done by D.M. Harwood and V.A. Nikolaev was illuminative in clarifying the stratigraphic position of the Formation. We wish to express our thanks to both scientists as we have cited a part of their publication. It must be made clear, however, that the present authors are solely responsible for the stratigraphic conclusions. |
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| 摘 要： | The Early Cretaceous Sindong Group, a non-marine molasse, unconformably overlies the folded earliest Cretaceous Myogok Formation. The tectonism that folded the Jaseong Synthem including the Myogok and other formations is here called the Nakdong-Jaeryeonggang （N-J） tectonism. The Oknyeobong and Dabokni Formations are discussed to show that they belong to the Jaseong Synthem. The Dabokni Formation yielded fossil diatoms whose age has been referred as the ＂earliest Cretaceous＂ based on the geologically constrained age of the fossil-bearing deposit. The age of the N-J tectonism appears Barremian as it is between the Hauterivian Myogok Formation and the Aptian Sindong Group with the TPN （Trigonioides-Plicatounio-Nippononaia） fauna. The N-J tectonism, an orogeny, quite deformed pre-Aptian strata in Korea, but can hardly find its reported equivalent in NE China. A revised correlation table shows that the Jaseong- Sindong sequence corresponds to the Jehol Group of China. The Sindong-Hayang transition was characterized by basin migration and dextral rotation probably caused by the Tan-Lu fault system in a broad sense.
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| 关 键 词： | 白垩纪早期 侏罗纪晚期 硅藻 地质构造 |
| 收稿时间： | 2007/12/3 0:00:00 |
| 修稿时间： | 2008/9/22 0:00:00 |
Early Cretaceous Tectonism and Diatoms in Korea |
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| Authors: | Ki-Hong CHANG Sun-Ok PARK |
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| Institution: | Department of Geology, Kyungpook National University, Daegu, Korea |
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| Abstract: | The Early Cretaceous Sindong Group,a non-marine molasse,unconformably overlies the folded earliest Cretaceous Myogok Formation.The tectonism that folded the Jaseong Synthem including the Myogok and other formations is here called the Nakdong-Jaeryeonggang(N-J) tectonism.The Oknyeobong and Dabokni Formations are discussed to show that they belong to the Jaseong Synthem.The Dabokni Formation yielded fossil diatoms whose age has been referred as the"earliest Cretaceous"based on the geologically constrained age of the fossil-bearing deposit. The age of the N-J tectonism appears Barremian as it is between the Hauterivian Myogok Formation and the Aptian Sindong Group with the TPN(Trigonioides-Plicatounio-Nippononaia) fauna.The N-J tectonism,an orogeny,quite deformed pre-Aptian strata in Korea,but can hardly find its reported equivalent in NE China.A revised correlation table shows that the Jaseong- Sindong sequence corresponds to the Jehol Group of China.The Sindong-Hayang transition was characterized by basin migration and dextral rotation probably caused by the Tan-Lu fault system in a broad sense. |
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| Keywords: | Early Cretaceous Late Jurassic Dabokni Formation Jaseoung Synthem NakdongJaeryeonggang tectonism Archaic fresh-water diatoms |
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