Genesis of an unusual clastic dike in an uncommon braided river deposit
Su Dechen1, 2, A. J. (Tom) van Loon3, *, Sun Aiping1, 2
1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. State Key Laboratory of Continental Tectonics and Dynamics, Beijing 100037, China; 3. Geological Institute, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznan, Poland
A clastic dike containing unusually large clasts occurs in the Quaternary deposits that unconformably cover the Mesoproterozoic sediments in the Fangshan District, Beijing area, China. The material into which the dike intruded is also uncommon because it consists mainly of loess-type silts that were deposited by braided rivers. The intrusion of the dike is explained as the result of the expulsion of pore water into the coarse, gravel-containing layers of a braided river system. The large size of the clasts in the dike is explained by an exceptionally strong upwards-directed flow which owed its high energy to a high hydrostatic pressure that had been built up because pore water could not gradually seep through the impermeable silt-sized material during ongoing burial. This uncommon dike is compared with a second example, in similar Quaternary sediments covering the Mesozoic rocks in the Huairou District.
The authors are indebted to Prof. Lü Jinbo, Mr. Duan Xu, and Mr. Guo Rongtao for valuable suggestions and for their help in the field. The second author is indebted to Prof. Feng Zengzhao and Prof. Bao Zhidong, who provided the financial means to come to China to carry out the fieldwork.
Su Dechen,A. J. (Tom) van Loon,Sun Aiping. Genesis of an unusual clastic dike in an uncommon braided river deposit[J]. Journal of Palaeogeography, 2013, 2(2): 127-137.
Su Dechen,A. J. (Tom) van Loon,Sun Aiping. Genesis of an unusual clastic dike in an uncommon braided river deposit[J]. Journal of Palaeogeography, 2013, 2(2): 127-137.
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