九江地区第四系中典型地裂缝特征及构造意义  

Typical Fissure Characteristics of the Quaternary in the Jiujiang Area and their Tectonic Significance

作　　者：齐信[1] 陈州丰[1] 邵长生[1] 陈立德[1] 

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430223

出　　处：《地质学报》2015年第12期2266-2276,共11页Acta Geologica Sinica

基　　金：中国地质调查局项目"长江中游城市群活动构造与地壳稳定性评价"(1212011120097)资助

摘　　要：在九江地区开展断裂活动性调查中,发现了一些第四纪剖面中发育丰富的地裂缝。本文选择三个第四系中典型地裂缝出露剖面为研究材料,通过野外实测展开对剖面的地层序列、地裂缝的宏观和微观特征及地裂缝与区域断裂分布规律进行分析,有以下4点发现:1九江地区第四系中地裂缝形态特征多样,多呈"V"型,"倒V"型,"Y"型,"扫帚"型和"直线"型等;2地裂缝内均有充填物,充填物多呈灰白色、浅灰色条带,宽度不等,多呈上窄下宽,向上渐尖灭,向下未见底。地裂缝内充填物具有劈理化、压扁、挤压、拖拽等受力流变现象;3平面分布上,地裂缝出露剖面PM1位于九江-德安断裂NE末端,PM2位于襄樊-广济断裂SE末端,PM3位于城门山-范家铺断裂带中部,地裂缝出露剖面位置与九江地区区域性断裂展布和历史地震震中分布都具有高度相关性。同时,PM1、PM2和PM3三个剖面的主要地裂缝走向分别为NE、NW和NEE,与其高度相关的断裂走向也分别一致;4PM3剖面发育一条第四纪断层,断层产状为145°∠68°,显示正断性质,最大错据可达1m。综上分析,笔者认为九江地区第四系中典型地裂缝发育是受区域性断裂和地震震中控制的,地裂缝的形成是区域性断裂活动和古地震事件在地表的响应。九江地区第四纪地裂缝的发现,给该区的断裂活动性和古地震研究提供了丰富的研究材料,也为断裂活动性和古地震研究提供了一个新研究思路和研究方法。Our curvey for fault activity in the Jiujiang area found some profiles of the Quaternary contain abundant fissures.Three typical exposed profiles within fissures were chosen as researth material in this paper.Based on the analysis of stratigraphic sequence of profiles, macroscopic and microscopic characteristics of the fissure and and the distribution regularity between fissures and faults,we had found the following 4points：①There are many types of fissures,mostly ＂V＂type,＂inverted V＂type,＂Y＂type,＂broom＂type and ＂straight line＂type,etc.②Fissures have fillings,which are pale,gray pale stripe,varying widths,narrow in apperpost and wide lower part,in upward pinchout,down not bottom.③The planar distribution,PM1 is located in the NE and of the Jiujiang-Dean fault,PM2 is located in the SE end of the Xiangfan-Guangji fault,PM3 is located in the middle of the Liujia-Fanjiapu-Chengmenshan fault;the profiles within fissures position are highly correlated with regional faults distribution and historical earthquake epicenter distribution in the Jiujiang area.Meanwhile,the main faults strikes of PM1,PM2 and PM3are NE,NW and NEE respectively,what are highly relevant to their fault strikes with a maxionun offset up to 1m.④PM3 profile has a uaternary fault the fault occurrence 145°∠68°,shows normal fault properties,Our tempshtion stady shows that the typical fissure development in the quaternary is controlled by regional faults and earthquake epicenters,and the formation of the fissure is discovery reponse to regional fault activity and paleo-earthquake event in quaternary on the surface of the Earth.The typical fissures of the quaternary of in the Jiujiang area,not only what provides a good study care to the fault activity and paleo-earthquake in this area but provide a new research idea and research methods for the study of fault activity and paleo-earthquake.

关 键 词：地裂缝 裂缝泥 活动断层 古地震 九江地区 

分 类 号：P315.2[天文地球—地震学]