Quaternary stratigraphic division and its environmental significance of Borehole QHJ01 in southern alluvial plain of the Yongding River
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摘要: 对永定河冲积平原南部固安县东三更生村501 m深的QHJ01孔岩心进行了岩石地层、磁性地层、AMS 14C和光释光（OSL）测年等研究。结果表明：①Matuyama（松山）/Gauss（高斯）和Brunhes（布容）/Matuyama（松山）极性界线分别位于231.2 m和78.7 m处，结合岩石地层学及生物地层学特征，确定地层埋深在231.2 m、78.7 m处分别作为下更新统、中更新统的底界。②通过AMS 14C、光释光（OSL）测年，确定上更新统和全新统的底界深度分别位于53.5 m和25.5 m。③古永定河冲洪积扇在上新世末期即到达了固安地区，其岩石地层学标志是上新世首次出现的厚层“泥包砾”层之上含大量泥砾的砂层。④第四纪以来，永定河冲洪积平原南部（固安地区）为永定河多期改道与摆动形成的泛滥沉积环境。本研究为廊（坊）固（安）凹陷中心地带第四纪地层划分对比、古地理环境演化研究，提供了重要的年代地层格架。Abstract: Based on the core materials collected from the Borehole QHJ01, which is located at Dongsangengsheng village of Guan county in southern alluvial plain of the Yongding River and has a depth of 501m, the analyses oflithostrotigraphy, magnetostratigraphy, AMS 14C and OSL dating, ostracoda and sporopollen assemblages were carried out.The results show that:①The boundaries of Matuyama/Gauss polarity chron and Brunhes/Matuyama polarity chron appear at the depth of 231.2m and 78.7m, respectively.Combined with the characteristics of rock stratigraphy and biostratigraphy, it suggests that the bottom of the Lower Pleistocene and Middle Pleistocene is 231.2 m and 78.7 m.②The dating of AMS 14C and OSL shows the bottom of the Upper Pleistocene and the Holocene is 53.5m and 25.5 m.③The alluvial fan of the palaeo-Yongding River reached the Guan area at the end of the Pliocene, and its petrological sign is a thick gravel sand layer above the thick muddy boulder layer of the Pliocene, which was first appeared in the Pliocen.④Since the Quaternary, the southern part of the Yongding River alluvial plain is dominated by the overflowing sedimentary environment of the Yongding River.The present paper provided important age control for Quaternary stratigraphic division, correlation and paleogeographic environmental evolution in thecentral areaof the Lang(fang)-Gu(an)Depression.
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