粤北地貌的形成发育和生产利用

The Formation,Development and the Utilization of the Landform of the North of Guongdong

粤北地貌宏观结构具网格型式,网格内部是盆地,棱边是山地,属次生构造地貌.燕山运动完成了本区构造地貌轮廓,喜山运动是丹霞地貌和北江水系形成发育的重要内力因素,本区新构造运动以大面积间歇拾升为主,幅度不大,新第三纪以来抬升可达700米或更多,据古地磁资料分析,近100万年以来抬升约达70米.不同地层岩性的垂向差别侵蚀尺度目前已达n×100米数量级,而近100万年以来构造运动幅度差异只有n×10米数量级,所以粤北地貌主要是在100万年以前地壳运动基础上经长期侵蚀形成的,而不是近100万年来活动构造的差异性活动造成的.本文还讨论了各地貌类型组合与各种资源条件的关系,并提出有关生产利用建议.

The macrostructure of the landform of the North of Guangdong appearsas a net pattern.There are basins in the interiors of nets,mountainous regionsin the arrises of nets.The neotectonic movement in this area is chiefly charac-terized by extensive,spasmodic uplift.The uplift may arrive at 700 m or moresince Neogene Period,at 70m since a million years late.The vertical differentialerosion scales in distinct rock stratums and lithologies have arrived at n×100mmagnitudes.The forming of landform of North of Guongdongmainly is not thatmoving tectonics moved differentyl since a million years,but is that was erodedfor a long time on the basis of crustal movement befor a million years.The thesisis yet discussed the relationship between the groups of landform type andconditions of various resources and is raised proposals concerning utilization.