THE RESEARCH ON ACTIVITY BEHAVIOR OF CHONGGANGSHAN-WANGQIAN SEGMENT OF TAN-LU FAULT ZONE SINCE LATE PLEISTOCENE

doi:10.3969/j.issn.0253-4967.2015.11

Abstract

Abstract:

The relationship between the latest displacement of active fault and seismic events is an important basic problem. Taking the Sihong segment of the Tan-Lu Fault as the main research area, we selected the Chonggangshan-Wangqian segment as the study section by Google map terrain analysis, excavated 6 large scale trenches, identified and cataloged the Late Quaternary deformation events and prehistoric earthquake relics, analyzed activity stages and behavior of the section. The result indicates that the Chonggangshan-Wangqian segment of the Tan-Lu Fault has undergone intense compression and thrust movement since the Late Quaternary. It is displayed that the brick-red sandstone of Upper Cretaceous thrust at high angle over the yellowish-brown clay of the Late Pleistocene in Chonggangshan segment, while the white or yellow sandstone of Oligocene in Wangqian segment thrust westward over the Late Quaternary sediments, accompanied by rifting activity. By the ¹⁴C dating, we get two paleoearthquake events, and their age is (11 755±45)～(10 525±45)a BP and about(10 135± 50)a BP, respectively. This suggests that the Chonggangshan-Wangqian segment of Tan-Lu Fault zone has undergone strong thrust movement since the late Pleistocene, and this activity had continued to the early Holocene.

Key words: Tan-Lu Fault, Chonggangshan-Wangqian segment, late Pleistocene, prehistoric earthquake activity

摘要：

活动断裂最新错动与地震事件的关系是重要的基础研究课题。文中选定郯庐断裂带泗洪县重岗山—王迁段, 开挖大型探槽, 识别编录晚第四纪以来变形和史前地震事件, 分析其活动期次和特性。结果表明, 郯庐断裂带重岗山—王迁段晚第四纪以来曾发生强烈的挤压逆冲活动, 在重岗山表现为晚白垩世砖红色砂岩向西高角度逆冲于晚更新世黄褐色黏土之上, 在王迁则表现为黄白色上新世砂岩向西逆覆于晚第四纪沉积之上, 且存在部分张裂现象。通过¹⁴C测年分析, 得到重岗山—王迁段的2次古地震事件, 其年代依次为(11 755±45)～(10 525±45)a BP与(10 135±50)a BP。郯庐断裂带重岗山—王迁段晚更新世以来逆冲活动强烈, 而且一直持续到全新世初期。

关键词: 郯庐断裂带, 重岗山—王迁段, 晚更新世, 史前地震活动

CLC Number:

P315.2

SHEN Xiao-qi, YAO Da-quan, ZHENG Hai-gang, YANG Yuan-yuan, ZHAI Hong-tao, ZHENG Ying-ping, WANG Jun, ZHAO Peng, XIAO Wei-peng. THE RESEARCH ON ACTIVITY BEHAVIOR OF CHONGGANGSHAN-WANGQIAN SEGMENT OF TAN-LU FAULT ZONE SINCE LATE PLEISTOCENE[J]. SEISMOLOGY AND GEOLOGY, 2015, 37(1): 139-148.

沈小七, 姚大全, 郑海刚, 杨源源, 翟洪涛, 郑颖平, 王俊, 赵鹏, 肖伟鹏. 郯庐断裂带重岗山—王迁段晚更新世以来的活动习性[J]. 地震地质, 2015, 37(1): 139-148.

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