生长地层揭示松原地区孤店断裂第四纪以来的构造特征

doi:10.3969/j.issn.0253-4967.2018.06.004

摘要/Abstract

摘要： 近年来松原地区地震活动频繁，该地区第四纪以来的构造运动形式日益成为人们关注的问题。文中选择松原地区位于松辽盆地中央坳陷和东南隆起2个构造单元之间的孤店活动断裂作为研究对象，利用生长地层讨论孤店断裂第四纪的构造特征，为研究区域构造演化、抗震设防提供依据。利用深部石油反射地震勘探数据，厘定了孤店断裂的位置、几何学和运动学特征。依据浅层反射地震探测、联排钻孔探测以及第四纪年代学测试数据，精细地确定了孤店断裂第四纪以来的构造活动形式，通过这些数据分析认为孤店断裂在第四纪以逆冲褶皱构造为主。基于浅层地震剖面和联排钻孔识别出1套由逆冲褶皱形成的先超覆后退覆的生长地层，利用沉积速率与抬升速率的关系，估计早更新世早期孤店断裂的抬升速率<0.15mm/a；早更新世晚期断裂的抬升速率>0.091mm/a；中更新世的抬升速率>0.052mm/a。同时根据年代学数据，确定孤店断裂在205ka BP以来的抬升速率为0.046mm/a。

关键词: 松原, 生长地层, 孤店断裂, 第四纪

Abstract: Because of the frequent seismic activity in Songyuan in recent years, the modes of tectonic movement in this area since the Quaternary have attracted increasing consideration. This paper selects the Gudian Fault which locates between the southeast uplift and central depression of Songliao Basin as the research object. We discussed the Quaternary structural characteristics of the Gudian Fault using growth strata. Using the data of deep seismic reflection prospecting for oil, we determined the location, geometry and kinematics characteristics of the Gudian Fault. And using the shallow seismic reflection prospecting data, the combined drilling exploration data and TL data, we determined precisely the inversion tectonics feature of the fault since late Cenozoic. Based on the above data, we believe that the Gudian Fault is dominated mainly by thrust-folding since Quaternary. A set of growth strata is recognized by shallow seismic reflection exploration data. According to the overlap of growth strata and the relationship between deposition rate and uplift rate, we confirm that the uplift rate of Gudian Fault in the early of Early Pleistocene is less than 0.15mm/a. And according to the offlap of growth strata and the relationship between deposition rate and uplift rate, the uplift rate of the Gudian Fault is more than 0.091mm/a in the late of Early Pleistocene and more than 0.052mm/a in middle Pleistocene. According to the chronological data, it is determined that the uplift rate of the Gudian Fault is 0.046mm/y since 205ka.

Key words: Songyuan, growth strata, Gudian Fault, Quaternary

中图分类号:

P546

于晓辉, 沈军, 戴训也, 王昌盛. 生长地层揭示松原地区孤店断裂第四纪以来的构造特征[J]. 地震地质, 2018, 40(6): 1240-1253.

YU Xiao-hui, SHEN Jun, DAI Xun-ye, WANG Chang-sheng. GROWTH STRATA REVEAL THE QUATERNARY TECTONIC FEATURE OF GUDIAN FAULT IN SONGYUAN, SONGLIAO BASIN, CHINA[J]. SEISMOLOGY AND GEOLOGY, 2018, 40(6): 1240-1253.

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