APPROACH OF THE GEOLOGIC TECTONIC CHARACTERISTICS IN HONG KONG-KOWLOON

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.