摘要
本文重点论述了南宁盆地北侧断裂的特征及其发展规律。文章通过各种宏观构造、微构造和显微构造证据说明该断裂带是在加里东期及印支期所形成的压扭性断裂构造的基础上发展而成的。在白垩纪之后,开始出现伸展性。南宁盆地雏形亦是在此时出现,并在第三纪时进一步扩大形成。在第三纪时,断裂表现为控相的和沉积作用同时代的断层,并与第三系及第四系组成北深南浅的箕状构造。另外,还论证了该断裂带在晚第三纪以来仍有活动。从而确定该断裂带是一条多期性连续活动断裂,进一步说明了南宁断块陷落盆地的形成条件与成生时期。
This paper lays stress on the description of the characteristics and the development of the fault in the northern part of the Nanning Basin. Based on evidence of macrostructure, microstructure, and microscopic structure, it is proved that the fault originated and has developed from the compressive-twisted fault which formed during Caledonian and Indosinian age. After the Cretaceous, the fault began to extend. Meanwhile the precursor of the Nanning Basin began to form, and later developed into a complete basin in the Tertiary. During the Tertiary, the fault was a syndepositional one which controlled sedimentary fades, and later constituted with Tertiary and Quarternary strata a structure which was deep in the north and shallower in the south.
This paper proves that the fault zone has been active since the Late Tertiary and has undergone continuous movement in different periods of time. This paper also describes the age and the conditions under which the faulted basin of Nanning formed.
