摘要:
提要：1:25万常德市幅自西向东跨武陵隆起和江汉—洞庭盆地，具复杂的第四纪隆-凹构造格局。以详细地表调查和大量第四系钻孔资料为基础，以第四纪构造活动、沉积作用以及现今地势高低和地貌形态特征为主要依据，对1∶25万常德市幅进行了构造-沉积地貌类型的划分与编图。构造-沉积地貌类型是以第四纪地质作用为依据对传统地貌类型和地貌单元所作的分解和细化。研究区共厘定出抬升剥蚀中低山（Ⅰ）、抬升剥蚀丘陵（Ⅱ）、沉积-抬蚀丘陵（Ⅲ）、沉积-抬蚀岗状平原（Ⅳ）、残坡积岗状平原（Ⅴ）、孤山（Ⅵ）、沉降沉积-抬蚀岗状平原（Ⅶ）、沉降沉积-抬升波状平原（Ⅷ）、稳定沉积低平原（Ⅸ）、沉降沉积低平原（Ⅹ）等10种构造-沉积地貌类型。详细的解析表明，不同构造-沉积地貌类型的地表高程、第四纪地壳升降特征、风化剥蚀和沉积作用等各具特征。构造-沉积地貌类型的划分及其地貌图的编制，不仅反映出地表地理环境暨地貌特征，同时提供了直观表达不同地区第四纪地层、构造特征及其反映的地质与环境演化过程的有效途径，有助于促进和深化江汉-洞庭盆地第四纪地质与环境研究。
Abstract:
Abstract：The 1∶250000 Changde Sheet strides across Wuling 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-falling 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, these means will promote and deepen researches on Quaternary geology and environment of the Jianghan-Dongting basin.
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