Quaternary Activity Characteristics and Regional Tectonic Significance of the Jiulong Fault in Jiujiang, Jiangxi Province, China

IF 4.1 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Xin Qi, Yuyong Jiao, Qinghua Li, Bin Li
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Abstract

Obtaining geological and landform dislocation features, as well as the measured stratigraphic activity age, provides direct evidence to evaluate fault activity, which is more difficult to do in areas with low tectonic activity, such as eastern and central China. A detailed investigation of the fault activity, trenching, drilling joint geological profile, geological survey, and chronological analysis were used to obtain the spatial geometry, fault kinematics, and activity chronology of the Jiulong fault. The conclusions are as follows: (1) The Jiulong fault was a fracture zone composed of four branch faults, with a width of around 30–40 m and good extendibility, while the maximum surface rupture length was 373 m. (2) The Jiulong fault has many strata dislocations, and the dislocation distance decreased from bottom to top, demonstrating synsedimentary structure characteristics, with a maximum stratigraphic dislocation distance of 18.2 m. (3) Preliminary analysis suggested the Jiulong fault as a secondary fracture of the Xiangfan-Guangji fault zone and provided evidence of the southeastward extension of the Xiangfan-Guangji fault. A preliminary hypothesis purported the Xiangfan-Guangji fault as the seismogenic fault of the Ms 5.0 magnitude earthquake in 1911. (4) According to OSL and ESR dating analyses, the upper breakpoint of the Jiulong fault cuts into the Late Pleistocene Xingang Formation (Qp3x) strata, and the latest active age of the Jiulong fault was 57.6 ka. The chronology analysis confirmed an active fault from the Late Pleistocene and identified a weak tectonic in Jiujiang Province, which represents the largest active fault outcrop uncovered in the area so far. This study provides evidence and research materials for the evaluation of fault activity and seismic stability in this region.

中国江西省九江市九龙断层第四纪活动特征及其区域构造意义
获得地质和地貌变位特征以及测得的地层活动年龄,为评估断层活动提供了直接证据,而这在中国东部和中部等构造活动较少的地区较难做到。通过对断层活动的详细调查、开挖沟槽、钻探联合地质剖面、地质调查和年代分析,获得了九龙断层的空间几何学、断层运动学和活动年代学。研究结论如下(1)九龙断层是由四条分支断层组成的断裂带,宽度约为 30-40 米,延伸性较好,地表最大断裂长度为 373 米;(2)九龙断层地层错动较多,错动距离自下而上逐渐减小,表现出统沉积构造特征,最大地层错动距离为 18.2 米。(3) 初步分析认为九龙断层是襄樊-广济断裂带的次级断裂,为襄樊-广济断裂向东南延伸提供了证据。初步假说认为襄樊-广济断层是 1911 年 5.0 级地震的发震断层。(4) 根据 OSL 和 ESR 测年分析,九龙断层上断点切入晚更新世新港组(Qp3x)地层,九龙断层最晚活动年龄为 57.6 ka。年代学分析证实九龙断层为晚更新世活动断层,并确定了九江地区的弱构造,是迄今为止九江地区发现的最大的活动断层露头。这项研究为评估该地区的断层活动性和地震稳定性提供了证据和研究材料。
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来源期刊
Journal of Earth Science
Journal of Earth Science 地学-地球科学综合
CiteScore
5.50
自引率
12.10%
发文量
128
审稿时长
4.5 months
期刊介绍: Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.
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