秦岭北麓断裂带晚第四纪活动的地貌表现   总被引：3，自引：0，他引：3  

侯建  柴宝龙 《地理学报》1995,50(2):138-146

本区地貌特征反映秦岭北麓断裂带的活动特点是：①第四纪以来主要发生垂直运动，其活动性质与程度有差异性、阶段性。第一、二级阶地的形态和年代资料表征秦岭北麓断裂带晚更新世和全新世垂直位错幅度和平均速率。②河流阶地在上升盘出口处高度大，而向上游逐渐减小，反映第四纪以来，秦岭断块山地继续发生由北向南的掀斜运动。③被断层切割的冲洪积扇体的结构和堆积层的产状特征，反映出山麓带多发育铲形断层。  相似文献   

Geomorphology and hydrology of upper sinking cove,cumberland plateau,Tennessee     

Jerry D. Davis  George A. Brook 《地球表面变化过程与地形》1993,18(4):339-362

Upper Sinking Cove, dissecting the eastern escarpment of the Cumberland Plateau, is characterized by a multiple aquifer, predominantly vadose hydrologic system with minor surface components. There is a central trunk channel along the axis of the cove and a network of independent tributaries. Aquitards within the limestones, particularly Hartselle Formation shales, have influenced both cave and surface landform development by perching ground waters and slowing the vertical growth of closed depressions. Long-term solutional denudation in the portion of the cove underlain by limestones (40 per cent) is an estimated 56 mm per 1000 years, suggesting that karst development began 15–16 million years ago. Despite lower soil CO₂ and spring water hardness, 61 per cent of annual denudation occurs in the six winter months when 76 per cent of yearly runoff occurs. Landform development in Upper Sinking Cove appears to have begun as stream erosion carved a valley first in the sandstone caprock of the escarpment and later in the underlying Pennington Formation limestones containing numerous shale layers which promoted surface stream flow. Eventually stream erosion exposed the massive Bangor limestones which allowed deep ground water flow. Surface streams were pirated underground with the eventual formation of the chain of three closed depressions which constitute Upper Sinking Cove.  相似文献   

哈纳斯湖地区地貌与湖的成因   总被引：1，自引：0，他引：1  

冯敏 《冰川冻土》1993,(4)

哈纳斯湖位于阿尔泰山深处,最大水深188.5m,平均水深122.1m。横断面具典型的箱形形态,在其底部存在现代活动地堑。湖盆的成因是强烈的构造断陷加上山谷冰川的创蚀及终碛垄的堰塞。随着终绩垄被出流下切,湖泊面积变小。  相似文献   

渭河盆地全新世隐伏构造活动   总被引：6，自引：1，他引：6  

侯建军  韩慕康 《地理学报》1994,49(3):258-265

通过对水系线密度和面密度的量计和制图分析，揭示了渭河盆地全新世构造活动的特征，为查明厚层新生代松散沉积物覆盖下隐伏构造的全新世活动提供简便有效的方法。  相似文献   

青藏高原北缘银石山地区地貌年代学初步研究   总被引：6，自引：0，他引：6  

柏道远  孟德保  贾宝华  罗灵生 《地质科技情报》2003,22(4):45-51

青藏高原北缘银石山地区可划分出7类一级地貌类型：强抬升断块区、弱抬升断块区、低丘区、早期夷平面残留区、晚期准夷平面分布区、冲洪积平原、残积缓丘区等。通过相关沉积物的光释光和石英电子自旋共振年龄以及覆于早期夷平面、后期山丘、夷平低地或堆积台面等之上的火山岩年龄测年,重塑了晚新生代以来的地貌演化过程：中新世中晚期—上新世中期为主夷平面发育时期,上新世晚期(3．7Ma)主夷平面解体,强(弱)抬升断块区和低丘山地等开始形成。早更新世早期在低丘区中形成夷平低地或堆积台面,中后期抬升断块区与低丘区相间的地表形貌特征进一步强化。中更新世早期(0．64Ma)残积缓丘区形成,中期(0．43Ma)嵩华山北面形成一级冰斗,中后期(0．365Ma)低丘区主要斜坡地貌成型,末期(0．178Ma)强抬升断块区的主要沟谷地貌基本成型。晚更新世以来主要河流阶地形成,其间在0．037Ma前后冲洪积平原形成。  相似文献   

Comparative studies of Danxia landforms in China     

QI Deli  YU Rong  ZHANG Renshun  GE Yunjian  LI Jialin 《地理学报》2005,15(3):337-345

Danxia geomorphology originates from China. This paper studies the spatial distribution and differences in characteristics of Danxia landforms. Based on relevant research and investigations, three congregated areas of Danxia landform in China are discussed in this paper. They are the southeast area (including Jiangxi, Fujian, Zhejiang, Hunan and Guangxi provinces), the southwest area (the transitional zone of Yunnan-Guizhou Plateau and Sichuan Basin) and the northwest area (including Longshan mountain and along the banks of the Huanghe River and its anabranches). Not only the conditions of geology and geography of the three areas but also the differences of Danxia landforms of the three areas are analyzed. The Danxia landscape, characterized by upright-shaped peaks, Danxia mesa, stone wall, cave and vertical cave, "Danxia natural bridge", "a narrow strip of sky" and so on, often presents in the southeast area. The landscape of southwest area is characterized by Danxia escarpment faces and waterfalls. In the northwest area, the Danxia landscape has the traits of arid areas simultaneously, for example, mud-coating type, columniation type, board type, moreover, it is greatly different between these environmental factors such as the microclimate, water, wind, and the loess cover. Finally it explores the causes which lead differences in landform and also explains the landform formation process and its mechanism with reference to the rates of crustal uplift, the tectonic red-basin, and the external processes including working of running water, weathering, biogenic, gravity in each area of Danxia Landforms in China.  相似文献   

金口大峡谷地貌成因与旅游资源   总被引：7，自引：0，他引：7  

罗成德 《山地学报》2004,22(1):30-35

金口大峡谷位于大渡河下游，主要支谷有8条，皆以嶂谷地貌为特色。与大峡谷相邻的大瓦山(3236m)为我国最高的桌状山。这一区域以喀斯特地貌为主，受新构造运动影响明显，具有丰富的旅游地貌资源。  相似文献   

KARST峰丛地貌煤层地温等值线绘制新方法初探     

韩绪山谢波  张心彬巩固 《中国煤田地质》2006,18(2):64-66

黔西北某井田KARST地貌煤层底板温度受岩溶、沉积环境、构造、水文地质条件等因素的影响，存在无规律变化现象。因此在计算未测地温值时，首先将9煤层底板深度、温度、标高进行多元线性回归分析，利用多元同归关系式计算钻孔地温值，与实测值一起进行线性插值，绘制9煤层底板地温等值线图，并圈出正常温度及一、二级高温范围。  相似文献   

流域地貌演化的不同阶段沟壑密度与切割深度关系研究   总被引：9，自引：3，他引：6  

张丽萍  马志正 《地理研究》1998,17(3):273-278

主要探讨了在流域地貌演化的不同阶段,沟壑密度与切割深度的复杂关系,建立了沟壑密度随切割深度变化的理论极值模型及相应阶段的函数,补充了各演化阶段地貌形态要素的定量、定性描述;反之,可用沟壑密度与切割深度的关系推断流域地貌的演化阶段。  相似文献   

贺兰山西侧紫泥湖地区晚更新世以来冰缘地貌过程与环境变化   总被引：3，自引：0，他引：3  

单鹏飞 《地质论评》1997,43(4):428-433

紫泥湖地区座落在贺兰山西边４５ｋｍ处，海拔高度约１２００ｍ，区域地形呈现向北“Ｖ”字形开口的箕状洼地，其上生长旱生植被群落，沿自南而北流的沟谷阶地下发育了冻融 褶皱、冰楔和砂楔等冰缘地貌类型和过程，研究结果表明区域年平均气温末次冰期早期（５５－３５ｋｂＢＰ）较氏１０．５－１２．５℃，末次冰期盛期（２０－１５ｋｂＢＰ）今低１２．５－１３．７  相似文献