珠江三角洲地区重磁资料解释的深部断裂及其新构造意义
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摘要
对珠江三角洲地区布格重力和航磁资料系统处理、研究、解释,确认珠江三角洲地区地壳深部存在近EW向、NW向和NE向3组断裂系统。近EW向断裂是深部主要断裂系统,大部分断裂深及30km以上,其中有些断裂是以往很少为人们关注的;NW向断裂分布也比较广泛,但深度相对较浅,大都在10km左右,不超过20km;NE向断裂虽然地表出露最广,规模最大,但只有广州-恩平断裂可深及30km以上,大多数也相对较浅,特别是以往一些被称为深大断裂的断裂只有10km左右深度,不超过20km。上述工作新成果同传统概念的珠江三角洲地区深大断裂格局有较大改变。本文提出"新构造期深大断裂"的新概念及理论分析、解释这种格局的改变。并认为它对研究新构造、地质构造、工程地质、地震地质、找矿、找水、地质灾害等方面或具有科学理论意义和实用价值。文章还阐述了近EW,NW和NE向3组断裂间的相互切割关系,认为前二组断裂活动较NE向断裂更活跃或更新一些。
Based on processing, analyzing, and interpreting the Bouguer gravity and aeromagnetic data,it is confirmed that there were three fault systems, the EW, the NW, and the NE in the crustal deep level of the Pearl River Delta region. The EW one is the main fault system in deep level,with the depth of the most part over 30km. According to this interpretation,the depth of the Fogang- Heyuan Fault(EW) was only about 10km, although it was formerly considered as an abyssal fault. The NW faults were distributed in a wider area,with the depth shallower than 20km, mostly about 10km. The outcrop of the NE faults is the most widely seen among these three fault systems. However,the NE faults,besides the Guangzhou- Enping Fault whose depth is over 30km, are relatively shallower, especially those previously considered as abyssal faults, such as the Heyuan - Zhongshan (Shaowu) Fault, the Huidong -Shenzhen(Lianghuashan) Fault which are about 10km and less than 20km in depth. These results differ largely from the traditional ideas on the abyssal fault pattern in Pearl River Delta region. We thus propose a new concept the Neotectonic Stage Abyssal Fault. According to this concept, all tectonic movements have their sources in the deep. Every tectonic movement had rearmed( sometimes even thoroughly reformed)the deep material composition and the structure pattern. All these should have been recorded in gravity and magnetic fields. This new concept might be applied to the some research fields, e. g., neotectonics, seismologeology, geological structure, geological hazard, and mineral and water resources. We also discussed the dissecting relationships among the three fault systems. The EW fault system dissected the other two more markedly. Then came the NW fault system and the NE fault system is the weakest.
Based on processing, analyzing, and interpreting the Bouguer gravity and aeromagnetic data,it is confirmed that there were three fault systems, the EW, the NW, and the NE in the crustal deep level of the Pearl River Delta region. The EW one is the main fault system in deep level,with the depth of the most part over 30km. According to this interpretation,the depth of the Fogang- Heyuan Fault(EW) was only about 10km, although it was formerly considered as an abyssal fault. The NW faults were distributed in a wider area,with the depth shallower than 20km, mostly about 10km. The outcrop of the NE faults is the most widely seen among these three fault systems. However,the NE faults,besides the Guangzhou- Enping Fault whose depth is over 30km, are relatively shallower, especially those previously considered as abyssal faults, such as the Heyuan - Zhongshan (Shaowu) Fault, the Huidong -Shenzhen(Lianghuashan) Fault which are about 10km and less than 20km in depth. These results differ largely from the traditional ideas on the abyssal fault pattern in Pearl River Delta region. We thus propose a new concept the Neotectonic Stage Abyssal Fault. According to this concept, all tectonic movements have their sources in the deep. Every tectonic movement had rearmed( sometimes even thoroughly reformed)the deep material composition and the structure pattern. All these should have been recorded in gravity and magnetic fields. This new concept might be applied to the some research fields, e. g., neotectonics, seismologeology, geological structure, geological hazard, and mineral and water resources. We also discussed the dissecting relationships among the three fault systems. The EW fault system dissected the other two more markedly. Then came the NW fault system and the NE fault system is the weakest.
引文
1) 任镇寰,刘天佑.珠江三角洲地区重磁资料处理解研报告.广东省地震局,2006
1) 广东省地震局.莲花山断裂带西南段危险性研究.2001
1 曾华霖.地球物理系列--重力场与重力勘探.北京:地质出版社,2005． 1-273 Zeng Hualin.Gravity Exploration.Beijing:Geological Publishing House,2005． 1-273
2 穆石敏,申宁华,孙运生.区域地球物理数据处理方法及应用.长春:吉林科学技术出版社,1990． 1-292 Mu Shimin,Shen Ninghua,Sun Yunsheng.Methods for Regional Geophysiacal Data Processing and Their Application.Changchun:Jilin Science and Technology Publishing House,1990． 1-292
3 任镇寰,黄剑涛,廖桂金等.广州地区重磁资料解释的深部断裂系统.华南地震,2007 ,27(4) :28-40 Ren Zhenhuan,Huang Jiantao,Liao Guijin et al.Interpretation of the gravity-magnetic data of deep-seated faults in Guangzhou region.South China Journal of Seismology,2007 ,27(4) :28-40
4 任镇寰,刘天佑,廖桂金等.五桂山北麓断裂的重磁资料解释.大地测量与地球动力学,2006,26(4) :92-96 Ren Zhenhuan,Liu Tianyou,Liao Guijm et al.Interpretation of gravimetric and magnetic data of Wuguishan north foot fault.Journal of Geodesy and Geodynamics,2006,26(4) :92-96
5 任镇寰,郭钦华,杨廉法.五桂山北麓断裂及其活动性.华南地震,2005,25(4) :17-24 Ren Zhenhuan,Guo Qmhua,Yang Lianfa.The fault and it's activity in the north foot of Wuguishan mountain.South China Journal of Seismology,2005 ,25(4) :17-24
6 广东省地质矿产局编.广‘东省区域地质志.北京:地质出版社, 1988． 718-781 Buren of Geology and Mineral Resources of Guangdong Province ed.Reglonal Geology of Guangdong Province.Beijing:Geologlcal Publishing House,1988． 718-781
7 任镇寰,孙崇赤,黄剑涛等.滨海断裂带珠江口段的重磁资料解释.海洋地质与第四纪地质,2008,28(3) :55-63 Ren Zhenhuan,Sun Chongchi,Huang Jiantao et al.Interpretation of the gravimetry and magnetometry data of the segment of the coastal fracture zone in the Zhujiang(Pearl)River mouth.Marine Geology and Quaternary Geology,2008 ,28(3) :55-63
8 黄咏茵,陈恩民,苏丹.1605年琼州大地震震源区区域重、磁场特征及深部构造背景研究(Ⅱ)续.华南地震,1988,8(3) :9-26 Huang Yongyin,Chen Enmin,Su Dan.Researches on the chracteristics of the reglonal gravity-magnetic fields and the setting of the deep-seated structures in the focal area of the Qiongzhou great earthquake of 1605(Ⅱ).South China Journal of Seismology,1988,8(3) :9-26
9 丁原章.常宝琦,肖安予等.水库诱发地震.北京:地震出版社,1989． 76-89 Ding Yuanzhang,Chang Baoqi,Xiao Anyu et al.The Reservoir Induced Earthquake.Beijing:Seismological Press,1989． 76-89
10 魏柏林,孙崇赤,秦乃岗等.珠江三角洲地震活动及预测研究.北京:地震出版社,2002． 26-53 Wei Bailin,Sun Chongchi,Qin Naigang et al.Study of Seismic Activity and Seismic Calculate for Pearlriver Delta Area.Beijing:Seismological Press,2002． 26-53
11 张文佑,张抗,杨树康.中国东部及相邻海域中新生代地壳演化与盆地类型.海洋地质研究,1982,2(1) :1-15 Zhang Wenyou,Zhang Kong,Yang Shukang.On the evolution of crust and the classification of Mesozoic and Cenozoic basins in the eastern China and adjacent sea area.Marine Geological Research,1982,2(1) :1-15
12 刘以宣.南海新构造与地壳稳定性.北京:科技出版社,1994． 85-95 Liu Yixuan.N eotectonice and Crustal Stability of South China Sea.Beijing:Published by Science Press,1994． 85-95
13 梁德华.试论南海系.海洋地质研究,1982,2(4) :8-15 Liang Dehua.On the Naihai system.Marine Geological Research,1982,2(4) :8-15
14 郝书俭,王春华.雷琼地区断裂构造的磁场分析.见:丁原章,李坪,时振梁等编.海南岛北部地震研究文集.北京:地震出版社,1988． 147-151 Hao Shujian,Wang Chunhua.A study on the fracture structure based on the magnetic field in the area of Leizhou Penisnla and North Hainan Island.In:Ding Yuanzhang,Li Ping,Shi Zhenliang et al.eds.Assembly of Seismic Thesis on North Hainan Island.Beijing:Seismological Press,1988． 147-151
15 陈伟光.珠江三角洲及其邻近海域第四纪地质与地震危险性.华南地震,1998,18(2) :58-62 Chen Weiguang.The research of pearl river delta area seismic risk evaluation by Quaternary geology.South China Journal of Seismology,1998,18(2) :58-62
1) 广东省地震局.莲花山断裂带西南段危险性研究.2001
1 曾华霖.地球物理系列--重力场与重力勘探.北京:地质出版社,2005． 1-273 Zeng Hualin.Gravity Exploration.Beijing:Geological Publishing House,2005． 1-273
2 穆石敏,申宁华,孙运生.区域地球物理数据处理方法及应用.长春:吉林科学技术出版社,1990． 1-292 Mu Shimin,Shen Ninghua,Sun Yunsheng.Methods for Regional Geophysiacal Data Processing and Their Application.Changchun:Jilin Science and Technology Publishing House,1990． 1-292
3 任镇寰,黄剑涛,廖桂金等.广州地区重磁资料解释的深部断裂系统.华南地震,2007 ,27(4) :28-40 Ren Zhenhuan,Huang Jiantao,Liao Guijin et al.Interpretation of the gravity-magnetic data of deep-seated faults in Guangzhou region.South China Journal of Seismology,2007 ,27(4) :28-40
4 任镇寰,刘天佑,廖桂金等.五桂山北麓断裂的重磁资料解释.大地测量与地球动力学,2006,26(4) :92-96 Ren Zhenhuan,Liu Tianyou,Liao Guijm et al.Interpretation of gravimetric and magnetic data of Wuguishan north foot fault.Journal of Geodesy and Geodynamics,2006,26(4) :92-96
5 任镇寰,郭钦华,杨廉法.五桂山北麓断裂及其活动性.华南地震,2005,25(4) :17-24 Ren Zhenhuan,Guo Qmhua,Yang Lianfa.The fault and it's activity in the north foot of Wuguishan mountain.South China Journal of Seismology,2005 ,25(4) :17-24
6 广东省地质矿产局编.广‘东省区域地质志.北京:地质出版社, 1988． 718-781 Buren of Geology and Mineral Resources of Guangdong Province ed.Reglonal Geology of Guangdong Province.Beijing:Geologlcal Publishing House,1988． 718-781
7 任镇寰,孙崇赤,黄剑涛等.滨海断裂带珠江口段的重磁资料解释.海洋地质与第四纪地质,2008,28(3) :55-63 Ren Zhenhuan,Sun Chongchi,Huang Jiantao et al.Interpretation of the gravimetry and magnetometry data of the segment of the coastal fracture zone in the Zhujiang(Pearl)River mouth.Marine Geology and Quaternary Geology,2008 ,28(3) :55-63
8 黄咏茵,陈恩民,苏丹.1605年琼州大地震震源区区域重、磁场特征及深部构造背景研究(Ⅱ)续.华南地震,1988,8(3) :9-26 Huang Yongyin,Chen Enmin,Su Dan.Researches on the chracteristics of the reglonal gravity-magnetic fields and the setting of the deep-seated structures in the focal area of the Qiongzhou great earthquake of 1605(Ⅱ).South China Journal of Seismology,1988,8(3) :9-26
9 丁原章.常宝琦,肖安予等.水库诱发地震.北京:地震出版社,1989． 76-89 Ding Yuanzhang,Chang Baoqi,Xiao Anyu et al.The Reservoir Induced Earthquake.Beijing:Seismological Press,1989． 76-89
10 魏柏林,孙崇赤,秦乃岗等.珠江三角洲地震活动及预测研究.北京:地震出版社,2002． 26-53 Wei Bailin,Sun Chongchi,Qin Naigang et al.Study of Seismic Activity and Seismic Calculate for Pearlriver Delta Area.Beijing:Seismological Press,2002． 26-53
11 张文佑,张抗,杨树康.中国东部及相邻海域中新生代地壳演化与盆地类型.海洋地质研究,1982,2(1) :1-15 Zhang Wenyou,Zhang Kong,Yang Shukang.On the evolution of crust and the classification of Mesozoic and Cenozoic basins in the eastern China and adjacent sea area.Marine Geological Research,1982,2(1) :1-15
12 刘以宣.南海新构造与地壳稳定性.北京:科技出版社,1994． 85-95 Liu Yixuan.N eotectonice and Crustal Stability of South China Sea.Beijing:Published by Science Press,1994． 85-95
13 梁德华.试论南海系.海洋地质研究,1982,2(4) :8-15 Liang Dehua.On the Naihai system.Marine Geological Research,1982,2(4) :8-15
14 郝书俭,王春华.雷琼地区断裂构造的磁场分析.见:丁原章,李坪,时振梁等编.海南岛北部地震研究文集.北京:地震出版社,1988． 147-151 Hao Shujian,Wang Chunhua.A study on the fracture structure based on the magnetic field in the area of Leizhou Penisnla and North Hainan Island.In:Ding Yuanzhang,Li Ping,Shi Zhenliang et al.eds.Assembly of Seismic Thesis on North Hainan Island.Beijing:Seismological Press,1988． 147-151
15 陈伟光.珠江三角洲及其邻近海域第四纪地质与地震危险性.华南地震,1998,18(2) :58-62 Chen Weiguang.The research of pearl river delta area seismic risk evaluation by Quaternary geology.South China Journal of Seismology,1998,18(2) :58-62
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