River terraces in the northern Guizhou Plateau and their implications for karst landform evolution
JIANG Xi,1,2, CHEN Wenqi1, NING Fan1, SUN Yuhui1, AO Jin1, LUO Weijun3, KUANG Guangxian41. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China 2. Key Laboratory of Karst Geological Resources and Environment of Ministry of Education, Guizhou University, Guiyang 550025, China 3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 4. Administration for Shuanghe Cave National Geopark, Suiyang 563300, Guizhou, China
Abstract Geologists pay much attention to mountainous geomorphic evolution of Guizhou Plateau, because of its core region of karst area in Southwest China. There are two different geomorphic blocks in the northern Guizhou Plateau, which is representative for the karst landforms in Guizhou. River terraces in the karst intermontane basin, as an important step-like landform system in this area, are of great significance for the study of regional geomorphic evolution. In this work, we studied sediment characteristics and optical stimulated luminescence (OSL) dating of the terraces in the Suiyang Basin and the Wangcao Basin in the northern Guizhou Plateau. And then, the terrace ages and associated evolutionary dynamics of Guizhou Plateau have been discussed. Combining the terrace development and geological background, we explored karst landform evolution of northern Guizhou Plateau. It is found that in the Suiyang Basin, the ages of terrace are ranged between 18.8 ka-8.2 ka for T1 and 144.4 ka-104.1 ka for T2. In the Wangcao Basin, the ages of terrace are 5.5 ka for T1 and 45.1 ka for T2. In the Suiyang Basin, the terraces mainly deposited floodplain sandy sediments, while the terraces in the Wangcao Basin mostly cut the thick dolomite bedrock. The dating results show that in the formation stage of terrace T1, the average cutting rate of the Furong River in Wangcao Basin is 1.67 m/ka, significantly greater than that of the Yangchuan River in the Suiyang Basin, which is 0.35 m/ka. According to dating and regional geological correlation, we hold that climate change may affect the sedimentary characteristics of the terraces, but tectonic uplift is the dominant driving force for terrace formation. Different terrace ages are the results of differential uplifts in the Guizhou Plateau. Based on the terrace characteristics and dating, we found that tectonic uplift and river undercutting in the Wangcao Basin were more intensive than those in the Suiyang Basin. Actively driven by differential tectonic uplift and river erosion, the karst deep-cutting gorges and peak clusters landform is formed in the Furong River Basin, a part of Dalou Mountain, while the flat intermontane basins and hill clustered landform has been developed in the middle reaches of Wujiang River Basin. Keywords：Guizhou Plateau;river terrace;OSL dating;karst;landform evolution
PDF (5958KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 蒋玺, 陈文奇, 宁凡, 孙玉慧, 敖进, 罗维均, 况光显. 贵州高原北部河流阶地发育与喀斯特地貌演化. 地理研究[J], 2021, 40(1): 81-92 doi:10.11821/dlyj020200485 JIANG Xi, CHEN Wenqi, NING Fan, SUN Yuhui, AO Jin, LUO Weijun, KUANG Guangxian. River terraces in the northern Guizhou Plateau and their implications for karst landform evolution. Geographical Research[J], 2021, 40(1): 81-92 doi:10.11821/dlyj020200485
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,1,2, 陈文奇1, 宁凡1, 孙玉慧1, 敖进1, 罗维均3, 况光显4
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