冰后期胶州湾层序地层划分与沉积环境演变
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摘要
通过对胶州湾青岛近海沉积物微古化石及浅层地震资料的综合解释,运用层序地层概念,确定了层序界面的划分方法。初次海泛面之下为河流沉积,微体古生物缺乏,其上岩性以含贝壳的砂质粗粒为主,微古特征表现为低丰度、低分异度。浓缩段岩性为虫孔发育的泥质细粒组分,微古丰度出现最高值。据此可将胶州湾青岛近海层序地层划分为半个三级层序,海进体系域发育海侵边界层、潮沟充填及古滨岸沉积,高位体系域形成大沽河洋河复合三角洲沉积体及湾口两侧的潮汐三角洲沉积体。以层序的方法研究近岸沉积物有利于不同地域不同时代地层间的对比,通过岩性和微体化石及矿物分布等特征综合确定海泛面,在具有多物源、快速沉积特点的近岸海湾有一定的现实意义。
Definition of sequence stratigraphy on the offshore of Qingdao is carried out based on the analysis of microfossil properties of QDD3 core sediments and seismic data.Depositional system research is helpful to the spatial and space stratigraphy comparison using the conception of sequence.A half third-level sequence,considering no obvious evidence of sea-level drop in the East China Sea region,can be classified,which is composed of Transgressive Systems Tract(TST) and Highstand Systems Tract(HST) on the study area.Transgression boundary formation is an important interface above riverbed sediment.Its lithology is sandy coarse sediments and abundant with shell fragments.Microfossil abundance and diversity is at low-level.Lithology in condensed section is mainly mudy fine particle with worm holes,and abundance of microfossil gets its maximum value.Distinguishing of marine flooding surface from condensed section in the offshore region by seismic reflection feature is sometimes difficult as for the rapid depositional rate and multi-resources,so integrated utilization of lithology,microfossil and mineral character can be an effective method for recognizing the sequence stratigraphy.
Definition of sequence stratigraphy on the offshore of Qingdao is carried out based on the analysis of microfossil properties of QDD3 core sediments and seismic data.Depositional system research is helpful to the spatial and space stratigraphy comparison using the conception of sequence.A half third-level sequence,considering no obvious evidence of sea-level drop in the East China Sea region,can be classified,which is composed of Transgressive Systems Tract(TST) and Highstand Systems Tract(HST) on the study area.Transgression boundary formation is an important interface above riverbed sediment.Its lithology is sandy coarse sediments and abundant with shell fragments.Microfossil abundance and diversity is at low-level.Lithology in condensed section is mainly mudy fine particle with worm holes,and abundance of microfossil gets its maximum value.Distinguishing of marine flooding surface from condensed section in the offshore region by seismic reflection feature is sometimes difficult as for the rapid depositional rate and multi-resources,so integrated utilization of lithology,microfossil and mineral character can be an effective method for recognizing the sequence stratigraphy.
引文
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[2]朱雄华,林和茂.南黄海QC2孔化石群及海侵序列[C]//中国近海及沿海地区第四纪进程与事件.北京:海洋出版社,1989:46.61.[ZHU Xiong.hua,LI N He.mao.Fossil communities and transgressional sequence of drilling core QC2in the south.ern Huanghai(Yellow)sea[C]//Quaternary Processes and E.vents in China Offshore and Onshore Areas.Beijing:China O.cean Press,1989:46.61.]
[3]林和茂,朱雄华.南黄海及中国沿海第四纪海侵对比[C]//中国近海及沿海地区第四纪进程与事件.北京:海洋出版社,1989:33.45.[LI N He.mao,ZHU Xiong.hua.Correlation of Quaternary marine transgressions in southern Huanghai(Yellow)Sea and in China coastal areas[C]//Quaternary Processes and Events in China Offshore and Onshore Areas.Beijing:China Ocean Press,1989:33.45.]
[4]李善为.从海湾沉积物特征看胶州湾的形成演变[J].海洋学报,1983,5:328.339.[LI Shan.wei.Formation and evolution of Jiaozhou Bay based onthe sedi ment character[J].Acta Ocean.ological Sinica,1983,5:328.339.]
[5]韩有松,孟广兰.青岛沿海地区20000年以来的古地理环境演变[J].海洋与湖沼,1986,17:196.206.[HAN You.song,MENG Guang.lan.Paleogeography environment evolution for Qingdao offshore area since twenty thousand years[J].Oceanologia et Li mnologia Sinica,1986,17:196.206.]
[6]王永吉,李善为.青岛胶州湾地区20000年以来的古植被与古气候[J].植物学报,1983,25(4):385.391.[WANG Yong.ji,LI Shan.wei.Vegetation and cli mate since twenty thousand years in Qingdao Jiaozhou Bay area[J].Actabotanica Sinica,1983,25(4):385.391.]
[7]杨怀仁,谢志仁.中国东部近20000年来的气候波动与海面升降运动[J].海洋与湖沼,1984,15(1):1.13.[YANG Huai.ren,XIE Zhi.ren.Cli mate fluctuate and see.level change since twenty thousand yearsin East China region[J].Oceanologia et Li mnologia Sinica,1984,15(1):1.13.]
[8]Park Y A.The changes of sealevel and cli mate duringthelate Pleistocene and Holocene in the Yellow Sea region[J].Korean J.Quat.Res.,1992(6):13.20.]
[9]Fairbanks R G.A17000.year glacio.eustatic sea level record:influence of glacial melting rates on the Yonuger Dryas event and deep ocean circlulation[J].Nature,1989,342:637.647.
[10]孙映涛,董贺平,马立柱.全新世以来胶州湾中部沉积物矿物变化特征及沉积环境[J].海洋地质动态,2008,24(1):4.8.[SUN Ying.tao,DONG He.ping,MA Li.zhu.Mineral char.acter and sedi mentary environment for the Jiaozhou Bay cen.tral area since Holocene[J].Marine Geology Letters,2008,24(1):4.8.]
[11]李广雪,庄振业,韩德亮.末次冰期晚期以来地层序列与地质环境特征——渤海南部地区沉积序列研究[J].青岛海洋大学学报,1998,28(1):150.161.[LI Guang.xue,ZHUANG Zhen.ye,HAN De.liang.Stratigraphic sequences and charac.teristics of geological environment since thelate period of Last Glacial Age along southern shore of Bohai sea[J].Journal of Ocean University of Qingdao,1998,28(1):150.161.]
[12]董贺平,李广雪,李绍全,等.青岛近海潮流沉积体系[J].中国海洋大学学报自然科学版,2006,36(1):31.36.[DONG He.ping,LI Guang.xue,LI Shao.quan.On the offshore tidal depositional systemin Qingdao[J].Periodical of Ocean Uni.versity of China,2006,36(1):31.36.]
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