Tectonic-sedimentary landform classification of 1:250000 Changde Sheet and its implication for researches on Quaternary geology and environment of Jianghan-Dongting basin
The 1:250000 Changde Sheet strides across Willing uplift and Jianghan-Dongting basin from west to east, characterized by complicated Quaternary uplift-depression tectonic framework. Based on detailed geological mapping and lots of borehole data, the authors conducted tectonic -sedimentary landform classification and mapping of this sheet according to Quaternary tectonic activity, sedimentation and present elevation and topographic characteristics. Types of tectonic -sedimentary landforms were derived from decomposition of traditional landform types based on Quaternary geological process. Ten types of tectonic -sedimentary landforms were defined, namely, rising -denudation middle -low mountain ( Ⅰ ), uplift -denudation hilly area ( Ⅱ ), sedimentary and later uplift-denudation hilly area (Ⅲ), sedimentary and later uplift-denudation hilly plateau (Ⅳ), eluvial-slope wash hilly plateau (Ⅴ), isolated hill (Ⅵ), subsiding-sedimentary and later uplift-denudation hilly plateau (Ⅶ), subsiding-sedimentary and later uplift wave plateau (Ⅷ), stable sedimentary low plateau (Ⅸ) and subsiding-sedimentary low plateau (Ⅹ ). A detailed analysis shows that every type of tectonic-sedimentary landform possesses its unique characteristics of elevation, Quaternary uplifting-felling activity, weathering-erosion and sedimentation. Tectonic -sedimentary landform classification and geomorphologic map not only show geographic environments but also provide effective means for direct and visual expression of Quaternary strata, tectonic features and geological-environmental evolution. In addition, diese means will promote and deepen researches on Quaternary geology and environment of the Jianghan-Dongting basin.
国家科技期刊平台
NSTL
万方数据
维普
