摘要
中国东部新构造运动的地貌标志及其指示意义要给子重新认识。大陆东侧沿海地带在白垩纪至早第三纪时期是复杂高峻的山系，它们被雁行排列的裂谷分隔，新构造运动表现为不等量水平扩张和沉降或倾斜沉降。大陆东侧的海岸，从总体上来说是构造下沉港湾海岸。钱塘江口以北，从边缘海到太行山东麓的新构造运动反映了欧亚板块东部扩张型活动大陆边缘的构造运动特征。台湾岛由于欧亚板块与菲律宾海板块的碰撞而强烈上升。但台湾海峡为强烈裂陷，华南沿海是倾斜沉降。
It ought tO be reviewed the geomorphologic marks of Neotectonic movement inthe eastern China and its indicated significance. The summit level may be directly formed on the top of high mountain due to raising of rate of weathering anddenudation with the increase of mountain altitude . The origin of some of the highterraces was obviously related to the high sea-level during the Tertiary . But some ofthe buried deep trough embedded in large valley, which was buried under erodiblechannel related to the low sea-level during the Quaternary glacial periods, ought to bean ample evidence of tectonic sinking.In the eastern China, the tectonic movements were very violent from Cretaceous to Tertiary . The palaeogeomorphologic texture there were composed of series ofmassive mountain systems and rift valleys. The main rifts were the Yilan, the lowerLiaohe river-Bobal Sea-Huanghua . the Tancheng-Lujiang, the East China Sea, theTaiwan strait etc. The terrain relief betWeen the palaeio-mountain and the rift bottomreached 5 000-8 000m or more.The Neotectonic movements haVe been sunk differently in amount in the easternChina since the Neogene. The palaeo-mountain masses during the Cretaceous -Tertiarybecame 'hidden mountains' buried under the loose depositS with the thickness ofseveral thousand meters. And the low mountains and hills in Liaoning, Shandong, andJiangsu province were encircled by accumulation plains or shallow seas.The Neotectonic movementS of the southeastern coastal region were characterized by depression sloping towards the East China Sea, the Taiwan Strait and the SouthChina Sea. The palaeo-peak plane, originally formed on altitude of the climatic limit consisting of granite rock, with the weathered crust with thickness of hundred meters,has been sunk to altitude of 300- 150m or less above sea-level. In Taiwan Island,the mountains located at two sides of collisional suture between Eurasia plato andPhilippine plate, were characterized by strong uplift with a rate of 5.5- 11mm / asince the last full-glacial Period. Hence, the east side of the continent of China,generally is characterized by depression coast.
出处
《第四纪研究》
CAS
CSCD
北大核心
1998年第3期249-255,共7页
Quaternary Sciences
基金
国家自然科学基金!49571071
关键词
活动大陆边缘
扩张
新构造运动
中国东部
active continental margin, spreading, neotectonic movement sinking,the eastern China
