摘要
深圳大鹏半岛和香港地区古火山活动带,分布于广东省东部火山活动亚带莲花山火山喷发带上,属于浙闽粤港火山活动带,也是环太平洋火山活动带的一部分。为研究两地火山岩的成因机制、构造演化过程以及两地火山活动的异同点,本文采用实地考察、同位素测年等方法,从火山地层、构造和火山活动性等方面,对大鹏半岛与香港火山活动特征异同点进行对比研究。研究发现两地火山具有相似的沉积环境、相同区域地质构造背景,经历了相似的地质演化过程,火山活动时期也基本相同。二者的不同之处是地貌特征和地质景观不同,各具特色。香港的火山机构存在超级破火山口,六边形柱状节理普遍发育。大鹏半岛火山以火山穹丘为特征,典型火山地质现象是球粒、石泡、流纹、火山碎屑较为发育。根据同位素测年分析,大鹏半岛火山岩同位素年龄值为137~161 Ma,为侏罗纪晚期至白垩纪早期的产物。
The ancient volcanoes of Dapeng Peninsula,Shenzhen and Hong Kong are located in the eruption zone of the Lianhuashan Volcano,a sub-zone of volcanic activity in eastern Guangdong Province.It belongs to the volcanic belt of Zhejiang,Fujian and Guangdong,is also a part of the circum-Pacific volcanic belt.The purpose of this work is to explore the genetic mechanism,tectonic evolution and the similarities and differences of volcanic activities in these two places.Based on field investigations and isotope dating,we make a comparative study on the similarities and differences of volcanic activity characteristics between the Dapeng Peninsula and Hong Kong from the aspects of volcanic strata,structure and activity.Research suggests that the volcanoes of these two places have similar sedimentary environments,same regional geological structure background,similar geological evolution processes,and roughly same volcanic activity periods.The differences between the two places are the geomorphologic features and geological landscapes,and each has its distinct characteristics.There is a supercaldera in the volcanic structure of Hong Kong,where hexagonal columnar joints are widely developed.The Dapeng Peninsula volcano is characterized by volcanic domes,with typical volcanic geological phenomena of pellet,rock bubble,rhyolite and pyroclastic.According to isotopic dating,the age of volcanic rocks in Dapeng Peninsula is 137~161 Ma,which is the product of late Jurassic to early Cretaceous.
作者
姚锦梅
李洁兰
康镇江
宋建潮
唐嘉锋
YAO Jinmei;LI Jielan;KANG Zhenjiang;SONG Jianchao;TANG Jiafeng(Shenzhen Geology&Construction Engineering Company,Shenzhen,Guangdong 518023;Shenzhen Dapeng Peninsula National Geopark Administration Office,Shenzhen,Guangdong 518121;Geological Society of Shenzhen,Shenzhen,Guangdong 518023)
出处
《地质与勘探》
CAS
CSCD
北大核心
2022年第1期148-157,共10页
Geology and Exploration
基金
广东省深圳市地质局地质工程院士工作站专项经费项目(编号:2013B090400025)资助。
关键词
火山活动带
构造背景
火山地层
火山活动性
对比研究
大鹏半岛
深圳
香港
volcanic active belt
tectonic background
volcanic stratum
volcanic activity
comparative study
Dapeng Peninsula
Shenzhen
Hong Kong
