河北平原北部三河-黄土庄断裂第四纪以来活动性初探
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摘要: 随着京津冀一体化战略的实施，三河市承接了北京非首都功能的疏解，三河-黄土庄断裂为三河市北部的一条隐伏断裂，受断裂影响两侧第四系厚度相差较大，查明该断裂第四纪以来的活动性可为该地区工程建设等提供参考。本文通过人工浅层地震、地表氡气测量及钻孔对比等工作，对该断裂第四纪以来的活动性进行了初步研究。人工浅层地震剖面显示三河-黄土庄断裂为一条第四纪活动断裂，对第四系沉积具有一定的控制作用，上断点位置大约位于距地表25~30 m处；通过断裂两侧S13孔和S12孔与第四纪标准孔S9孔对比，建立了两个钻孔的第四纪地层格架。通过对比S13孔和S12孔各个时期地层沉积速率和标志层的位置，初步判断三河-黄土庄断裂上新世就活动剧烈，早更新世依然活动强烈，中更新世晚期-晚更新世断裂活动非常微弱甚至不活动。Abstract: With the implementation of the integration of Beijing-Tianjin-Hebei regions Strategy, the Sanhe city has undertaken to relocate all functions non-essential to Beijing’s role as the nation’s capital to neighboring areas. The Sanhe-Huangtuzhuang fault is a hidden fault in the North of the Sanhe city. The thickness of quaternary strata between the two sides is different greatly because of the influence of the fault. Finding out the activity of the fault since Quaternary period can provide reference for engineering construction in this area. Based on the artificial shallow seismic reflection profile、radon measurement and borehole correlation, this paper makes a preliminary study on its activity since the Quaternary period. The artificial shallow seismic reflection profile shows that the Sanhe-Huangtuzhuang fault is an active Quaternary fault and controls the deposition of Quaternary. The up-breakpoint of the fault is about 25-30 m away from the surface. By comparing S13 and S12 holes on both sides of the fault with Quaternary standard borehole S9, the Quaternary stratigraphic framework of the two boreholes are established. According to the comparison of deposition rates and marker beds of the two boreholes in different stages of Quaternary, It is speculated that the Sanhe-Huanghuangzhuang fault has been active since the Pliocene, the fault activity increased in the early Pleistocene, and gradually weakened or even inactive in the late Middle Pleistocene-late Pleistocene.
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