Discussion of alluvial architecture for the Upper Triassic Xujiahe Formation in terms of sedimentological impact of terrestrial vegetation on fluvial sedimentation: A case study at Pu′an section in Yongchuan of Chongqing
Mei Mingxiang, Liu Shaofeng
School of Earth Sciences and Natural Resources，China University of Geosciences（Beijing），Beijing100083
Although there are some different recognitions or controversies，more and more geological facts support that terrestrial vegetation had made obvious impact on fluvial sedimentation，which is chiefly expressed through the protection to riverbank resulted from carbonaceous materials that are preserved in the form of coal or peat and this promoted the development of meandering and anastomosing rivers.The Xujiahe Formation of the Upper Triassic in the Sichuan Basin is marked by a set of alluvial succession with coal seams，which makes up a succession of the molasses with the nature of foreland basin and becomes an example to study the fluvial succession controlled by vegetation.The Xujiahe Formation at the Pu′an section in Yongchuan of Chongqing is mainly composed of a fluvial succession，which can be subdivided into 6 members，i.e.， the fine-grained clastic deposits with coal seams belonging to the low-energy fluvial facies constitute the Members 1，3 and 5，and the sandy bottom-load deposits belonging to the high-energy fluvial facies make up the Members 2，4 and 6.The stratigraphic cyclicity reflected by lithostratigraphic divisions becomes the foundation to sequence-stratigraphic discerning and division;thus，the Xujiahe Formation at the Pu′an section can be grouped into three fluvial third-order depositional sequences. The fluvial sequences of the Xujiahe Formation at the Pu′an section have great significance, which is mainly based on the following two main features: （1）a particular alluvial architecture made up a generally upward-coarsing fluvial sequences that are different from the current model of the fluvial sequence;（2)high-energy channel sandstones that are obviously influenced by the development of vegetation.The observation and study on the fluvial depositional sequences of the Xujiahe Formation at the Pu′an section based on the sedimentological impact of the terrestrial vegetation to fluvial sedimentation will provide an important clue and a thinking approach for the further study on analysis of sedimentary facies of the Xujiahe Formation that is one of the more controversial issues in current stratigraphic research.
Mei Mingxiang,Liu Shaofeng. Discussion of alluvial architecture for the Upper Triassic Xujiahe Formation in terms of sedimentological impact of terrestrial vegetation on fluvial sedimentation: A case study at Pu′an section in Yongchuan of Chongqing[J]. JOPC, 2013, 15(2): 143-154.
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