西淋岗第四纪错断面特征及其成因
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摘要
西淋岗第四纪错断面位于佛山市顺德区陈村镇,有研究者认为这是晚第四纪活动断裂。为了进一步探明该错断面形成的机理,进行了大比例尺地质地貌填图、探槽开挖、浅层地震探测和第四纪地层年代测定等工作。结果表明,该点及其周边地貌上没有最新构造活动的迹象,但符合重力活动的特征。第四纪地层的错断和基岩中的断裂不能配套,不是统一构造应力场的产物。两侧物探反射特征表明,基岩断裂并未错断第四纪地层。根据基础地质条件、工程地质类比和高陡稳定性计算结果判断,该错断面的产生具备重力活动的条件,是重力失衡的结果,而并非由构造作用形成。
A Quaternary fault plane was found located at Chencun Town of Foshan City,which is thought as a late Quaternary active fault by many researchers. To explain the formation mechanism of this fault plane,a series of work was carried out,such as geomorphologic survey,validation by exploratory trench,shallow seismic reflection and dating of Quaternary system,etc. According to the analysis of the geomorphologic features,the contrast between bedrock fault and Quaternary fault,and the characteristics of shallow seismic reflection,there are few geomorphologic signs of recent tectonic activities. The displacement of Quaternary bottom and the rupture in the rocks were not formed in the same tectonic stress field,and the bedrock fault didn't offset the Quaternary formation according to the shallow seismic reflection characteristics. Thus,a conclusion is drawn that the Xilingang Fault plane wasn't generated by tectonic movement but the gravity inequilibrium.
A Quaternary fault plane was found located at Chencun Town of Foshan City,which is thought as a late Quaternary active fault by many researchers. To explain the formation mechanism of this fault plane,a series of work was carried out,such as geomorphologic survey,validation by exploratory trench,shallow seismic reflection and dating of Quaternary system,etc. According to the analysis of the geomorphologic features,the contrast between bedrock fault and Quaternary fault,and the characteristics of shallow seismic reflection,there are few geomorphologic signs of recent tectonic activities. The displacement of Quaternary bottom and the rupture in the rocks were not formed in the same tectonic stress field,and the bedrock fault didn't offset the Quaternary formation according to the shallow seismic reflection characteristics. Thus,a conclusion is drawn that the Xilingang Fault plane wasn't generated by tectonic movement but the gravity inequilibrium.
引文
陈国能,张珂.1995.珠江三角洲断裂构造最新活动性研究[J].华南地震,15(3):16—21.CHEN Guo-neng,ZHANG Ke.1995.The research of the fault tectonic activity in the Pearl River Delta[J].South China Journal of Seismology,15(3):16—21(in Chinese).
陈伟光,魏柏林,赵红梅,等.2002.珠江三角洲地区新构造运动[J].华南地震,22(1):8—18.CHEN Wei-guang,WEI Bo-lin,ZHAO Hong-mei,et al.2002.The neotectonic movement in Pearl River Delta area[J].South China Journal of Seismology,22(1):8—18(in Chinese).
邓起东.1984.断层性状、盆地类型及其形成机制[J].地震科学研究,(2):57—64.DENG Qi-dong.1984.The behavior of fault and basin type and their formation mechanism[J].Journal of EarthquakeStudies,(2):57—64(in Chinese).
董好刚,彭轩明,陈立德,等.2008.猴子包危岩体变形机理及稳定性预测[J].华南地质与矿产,(4):56—63.DONG Hao-gang,PENG Xuan-ming,CHEN Li-de,et al.2008.Deforming mechanisms and stability forecast of Houzibaodangerous rock body[J].Geology and Mineral Resources of South China,(4):56—63(in Chinese).
董好刚,彭轩明,陈州丰,等.2009.缓倾层状高边坡典型破坏模式及宏观判据研究[J].长江科学院院报,26(8):36—40.DONG Hao-gang,PENG Xuan-ming,CHEN Zhou-feng,et al.2009.Typical failure modes and identification of low-angled stratofabric rock slope[J].Journal of Yangtze River Scientific Research Institute,(8):36—40(in Chinese).
董好刚,陈立德,黄长生.2010.三峡库区云阳-江津段危岩形成的影响因素及稳定性评价[J].工程地质学报,18(5):645—650.DONG Hao-gang,CHEN Li-de,HUANG Chang-sheng.2010.Influence factors and stability assessment of dangerousrocks in Yunyang-Jiangjin on Three Gorges Reservoir[J].Journal of Engineering Geology,18(5):645—650(inChinese).
黄玉昆,夏法,陈国能.1983.断裂构造对珠江三角洲形成和发展的控制作用[J].海洋学报,(3):316—327.HUANG Yu-kun,XIA Fa,CHEN Guo-neng.1983.Control action of fault in the formation and development of the PearlRiver Delta[J].Acta Oceanologica Sinica,(3):316—327(in Chinese).
黄镇国,李平日,张仲英,等.1982.珠江三角洲形成发育演变[M].广州:科普出版社广州分社.HUANG Zhen-guo,LI Ping-ri,ZHANG Zhong-ying,et al.1982.The Formation,Development and Evolution of the PearlRiver Delta[M].Popular Sciences Press,Guangzhou Branch,Guangzhou(in Chinese).
刘尚仁.2008.珠江三角洲及其附近地区河流阶地的分布与特征:广东河流阶地研究之二[J].热带地理.28(5):400—404.LIU Shang-ren.2008.The distribution and characteristics of the river terraces in the Pearl River Delta and its nearby areas[J].Tropical Geography,28(5):400—404(in Chinese).
马浩明,吴业彪,陈庞龙,等.2007.广从断裂飞来岭—象岗山段最新活动性研究[J].震灾防御技术,2(4):339—345(in Chinese).MA Hao-ming,Wu Ye-biao,CHEN Pang-long,et al.2007.The latest activity of Feilailing-Xianggangshan segment inGuangzhou-Conghua Fault[J].Technology for Earthquake Disaster Prevention,2(4):339—345(in Chinese).
袁宝印,夏正楷,李保生,等.2008.中国南方红土年代地层学与地层划分[J].第四纪研究,28(1):1—13.YUAN Bao-yin,XIA Zheng-kai,LI Bao-sheng,et al.2008.Chronostratigraphy and stratigraphic division of red soil insouthern China[J].Quaternary Sciences,28(1):1—13(in Chinese).
袁家义,梁致荣,刘彝筠,等.1990.珠江三角洲Ⅱ级河流阶地的地质特征及其年代[J].中山大学学报(自然科学版),29(4):102—106.YUAN Jia-yi,LIANG Zhi-rong,LIU Yi-jun,et al.1990.The geological features and age of level II of the river terracesin the Pearl River Delta[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,29(4):102—106(in Chinese).
张珂,陈国能,庄文明.2009.珠江三角洲北部晚第四纪构造运动的新证据[J].华南地震,29(增刊):22—26.ZHANG Ke,CHEN Guo-neng,ZHUANG Wen-ming,et al.2009.New evidences for late Quaternary tectonic movementin the north Pearl River Delta[J].South China Journal of Seismology,29(suppl):22—26(in Chinese).
陈伟光,魏柏林,赵红梅,等.2002.珠江三角洲地区新构造运动[J].华南地震,22(1):8—18.CHEN Wei-guang,WEI Bo-lin,ZHAO Hong-mei,et al.2002.The neotectonic movement in Pearl River Delta area[J].South China Journal of Seismology,22(1):8—18(in Chinese).
邓起东.1984.断层性状、盆地类型及其形成机制[J].地震科学研究,(2):57—64.DENG Qi-dong.1984.The behavior of fault and basin type and their formation mechanism[J].Journal of EarthquakeStudies,(2):57—64(in Chinese).
董好刚,彭轩明,陈立德,等.2008.猴子包危岩体变形机理及稳定性预测[J].华南地质与矿产,(4):56—63.DONG Hao-gang,PENG Xuan-ming,CHEN Li-de,et al.2008.Deforming mechanisms and stability forecast of Houzibaodangerous rock body[J].Geology and Mineral Resources of South China,(4):56—63(in Chinese).
董好刚,彭轩明,陈州丰,等.2009.缓倾层状高边坡典型破坏模式及宏观判据研究[J].长江科学院院报,26(8):36—40.DONG Hao-gang,PENG Xuan-ming,CHEN Zhou-feng,et al.2009.Typical failure modes and identification of low-angled stratofabric rock slope[J].Journal of Yangtze River Scientific Research Institute,(8):36—40(in Chinese).
董好刚,陈立德,黄长生.2010.三峡库区云阳-江津段危岩形成的影响因素及稳定性评价[J].工程地质学报,18(5):645—650.DONG Hao-gang,CHEN Li-de,HUANG Chang-sheng.2010.Influence factors and stability assessment of dangerousrocks in Yunyang-Jiangjin on Three Gorges Reservoir[J].Journal of Engineering Geology,18(5):645—650(inChinese).
黄玉昆,夏法,陈国能.1983.断裂构造对珠江三角洲形成和发展的控制作用[J].海洋学报,(3):316—327.HUANG Yu-kun,XIA Fa,CHEN Guo-neng.1983.Control action of fault in the formation and development of the PearlRiver Delta[J].Acta Oceanologica Sinica,(3):316—327(in Chinese).
黄镇国,李平日,张仲英,等.1982.珠江三角洲形成发育演变[M].广州:科普出版社广州分社.HUANG Zhen-guo,LI Ping-ri,ZHANG Zhong-ying,et al.1982.The Formation,Development and Evolution of the PearlRiver Delta[M].Popular Sciences Press,Guangzhou Branch,Guangzhou(in Chinese).
刘尚仁.2008.珠江三角洲及其附近地区河流阶地的分布与特征:广东河流阶地研究之二[J].热带地理.28(5):400—404.LIU Shang-ren.2008.The distribution and characteristics of the river terraces in the Pearl River Delta and its nearby areas[J].Tropical Geography,28(5):400—404(in Chinese).
马浩明,吴业彪,陈庞龙,等.2007.广从断裂飞来岭—象岗山段最新活动性研究[J].震灾防御技术,2(4):339—345(in Chinese).MA Hao-ming,Wu Ye-biao,CHEN Pang-long,et al.2007.The latest activity of Feilailing-Xianggangshan segment inGuangzhou-Conghua Fault[J].Technology for Earthquake Disaster Prevention,2(4):339—345(in Chinese).
袁宝印,夏正楷,李保生,等.2008.中国南方红土年代地层学与地层划分[J].第四纪研究,28(1):1—13.YUAN Bao-yin,XIA Zheng-kai,LI Bao-sheng,et al.2008.Chronostratigraphy and stratigraphic division of red soil insouthern China[J].Quaternary Sciences,28(1):1—13(in Chinese).
袁家义,梁致荣,刘彝筠,等.1990.珠江三角洲Ⅱ级河流阶地的地质特征及其年代[J].中山大学学报(自然科学版),29(4):102—106.YUAN Jia-yi,LIANG Zhi-rong,LIU Yi-jun,et al.1990.The geological features and age of level II of the river terracesin the Pearl River Delta[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,29(4):102—106(in Chinese).
张珂,陈国能,庄文明.2009.珠江三角洲北部晚第四纪构造运动的新证据[J].华南地震,29(增刊):22—26.ZHANG Ke,CHEN Guo-neng,ZHUANG Wen-ming,et al.2009.New evidences for late Quaternary tectonic movementin the north Pearl River Delta[J].South China Journal of Seismology,29(suppl):22—26(in Chinese).
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