摘要
红土发育、气候变化、构造活动之间存在旋回、周期、因果、主次、配置等耦合关系。其中旋回和周期 ,以红土发育的阶段性为标志 ,突出一个“期”字。通过探讨红土旋回与季风发展期、冰期间冰期、新构造期、构造活动期等的对应关系 ,可以将我国第四纪分为 3个构造 -气候 (红土 )
It is generally considered that the evolution period of red earth is corresponded with the warm period of interglacial but the relationship between climate (red earth) and tectonic movement has not discussed well. The problem is still remained whether the warm period was associated with the relatively stable period or with the active period of tectonic movement. This paper hold the former point of view. The dating and distribution of red earth during N 2, Q 1, Q 2 and Q 3 show that the formation and evolution of monsoon circulation can be divided into 5 stages in China. In addition, the relationship between red earth and climate is also presented by the unanimity each other of cycles. Since early Pleistocene there were 10, 9 and 10 cycles of earth-climate in North China, the area of middle lower reach of Yangtze River and South China, respectively. The average main periodicity is 100～120 ka and the secondary is 60～70 ka. Taking the climate cycles of loess paleosoil series as a time mark, the multi layer red earth in south area of China can be contrasted with the interculated red layers in Loess one by one. The coupling relationship between red earth and the stages of neotectonics is obvious, for example, the deformed elevation of red earth of several periods of N 2, Q 1 and Q 2 indicates three important tectonic events since late Pliocene in China. These events are regarded as the main reason causing the formation of three large stepes of China's relief, which is marked by the distribution of red earth. The deformed emplitude of red earth is different in space and time showing the moving of block fault movement. Finally, by comparing the corresponding relation between cycles of red earth, uplift stages of Xizang Qinghai (Tibet) Plateau and development periods of monsoon circulation, three main cycles of tectonics-climate are deduced, namely the first (before 1 4 Ma BP), the second (1 4~0 64 Ma BP) and the third (since 0 64 Ma BP). For each cycle, two stages can also be divided, the former is characterized by relatively stable tectonics and warm climate, the latter, the active tectonics and cold climate.
出处
《地理学报》
EI
CSCD
北大核心
2000年第2期200-208,共9页
Acta Geographica Sinica
基金
广东省自然科学基金资助项目!( 92 0 2 3 5)&&
