香港九龙复活破火山的鉴别及其地质意义  

Identification of the Kowloon Revived Caldera in Hong Kong

作　　者：邢光福[1] 孙敏[2] 王步云[2] 李晓池 陈荣[1] 李龙明[1] 

机构地区：[1]国土资源部南京地质矿产研究所,南京210016 [2]香港大学地球科学系 [3]香港土木工程署

出　　处：《地质论评》2007年第3期363-370,共8页Geological Review

基　　金：中国地质调查局综合研究项目(编号200113000053);国家自然科学基金资助项目(批准号40002005)的成果

摘　　要：香港主城区座落在香港岛—九龙地区的九龙花岗岩体上,该花岗岩体平面形态呈直径约11km的圆形,周边火山岩群山环绕,构成特殊的圆形盆地地貌,以往曾有人认为是陨石坑。笔者根据前人地质资料分析并经实地考察,认为该地貌形态实为大致以尖沙咀为中心的一个大型晚中生代复活破火山机构,九龙花岗岩体为破火口塌陷后侵位的中央侵入体,周围火山地层产状围斜内倾,发育环形断裂(主要为高角度正断层)和放射状断裂,具典型复活破火山特征,可称之为“九龙复活破火山”。The Hong Kong city is situated within the Kowloon granite in the Hong Kong Island and Kowloon area. Round Kowloon granite with a diameter of about 11km and its surrounding volcanic rock mountains make up a evident round-shape basin which was deemed to be a meteorite crater. Based on geologic documents and our field surveyings, we propose that this basin is a large-scale Late Mesozoic revived caldera centered at Tsim Sha Tsu. The Kowloon granite is its central pluton formed after collapse, its volcanic wall-rocks appear ring-like inclined occurrences inwards overall and have ring faults （mainly mainly normal faults with steep inclined angles） as well as radial faults. We name it to be ＂the Kowloon Revived Caldera＂.

关 键 词：九龙复活破火山 晚中生代 香港岛和九龙地区 香港 

分 类 号：P317[天文地球—固体地球物理学]