摘要
香港—九龙地区,中生代以来地壳发生了方向不同的水平挤压活动,多层席状地质层体相互叠覆。末次自北往南的推覆活动使北部地体拼贴、叠置在南部相对原地体上。各期推覆形迹叠加改造,构造形态殊异,地壳表部的断裂也都受制於这一机制。
Hong Kong-KowLoon region is divided by Tolo Channel-Tsuen Wan fault zone into two parts-the south and north terranes. The north terrane has complicated structures, in which Paleozoic and Meso-Cenozoic strata crop out, and experienced the nappe compressions of SE-NW and N-S directions. The new and old geologic sheet-bodies of overlap appear broadly inverted succession, the dynamic metamorphism and deformation widely took place in pre early Cretaceous strata. North allochthone napped and docked into south autochthone along Tolo Channel-Tsuen wan fault, then resulted in a great number of the fenster and klippe associations, in last nappe activity.
The nappe structural features with SE-NW trend consisting of Repulse Bay Formation klippe and mid-acid plutonic rock, and accompanied imbricate fault structures in south Tolo Channel-Tsuen Wan fully indicate that the autochthone of late nappe activity is also non-root allochthone in early period.
The overlap of the north terrane surpass present position of Tolo Channel-Tsuen wan fault, therefore the actual front of the nappe would be in south Lautau Island klippe belonging to the north terrane formerly. The collision of the north terrane also has an intensive effect on underlying terrane, which give rise to a series of dome-shape and basin-shape structures in the position of tectonic syntaxis, such as the Tuen Mun and ShaTin-KowLoon dome-shape antiform in the same EW belt,the Lautau Island and HongKong Island ( south ) basin-shape synforms etc.
The nappe activity With NW trend took place in K2-E.The nappe structure features with EW trend not only destroys the structure features with NE trend but also have an effect on E stratum. The southward nappe activity might occurin E2 or QP.
出处
《石油实验地质》
CAS
CSCD
北大核心
1991年第2期152-157,共6页
Petroleum Geology & Experiment
