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地质论评  2007 

香港九龙复活破火山的鉴别及其地质意义

Keywords: 九龙复活破火山晚中生代香港岛和九龙地区香港

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Abstract:

香港主城区座落在香港岛一九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”。

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