辽东湾北部晚更新世中期以来的地层结构及环境演化
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摘要
晚更新世中期以来,辽东湾是一个在海侵-海退旋回中连续接受沉积的沉降盆地。在对岩心和高分辨率地层剖面记录分析的基础上,得到了本地区的地层结构和地震反射资料。从海底往下120.4 m的岩芯可划分为16个沉积层,沉积物以粗粒物质为主。根据地震反射资料,本区地层可分为6个地震单元,分别属于3个海相层和3个陆相层。与Bc-1孔相同,研究区沉积地层与冰期旋回具有明显的对应关系,冰期时形成陆相地层,间冰期时形成海相地层。冰期时河流作用较为发育,并且绝大多数河流沉积被风力作用所改造。
Since the middle stage of Late Pleistocene,the Liaodong Bay has been a subsiding basin to continuously receive sediments during regression-transgression cycles.Based on the analysis of core and high resolution stratigraphic profile records,the stratigraphic structure and seismic reflection data in the area are obtained.The core 120.4 m long shows 16 depositional strata,and its sediments are mainly coarse-grained components.According to the seismic reflection data,the strata in the area can be divided into 6 seismic units,and belong to 3 marine focies strata and 3 continental facies strata,respectively.Similar to those in Core Bc-1,the depositional strata in the area have obvious corresponding relation to the glacial-interglacial cycles,that is,the continental facies strata were formed during the glacial periods,and the marine facies strata were formed during the interglacial periods.The riverine actions were more developed during the glacial periods,and most of riverine deposits were rebuilt by the wind actions.
Since the middle stage of Late Pleistocene,the Liaodong Bay has been a subsiding basin to continuously receive sediments during regression-transgression cycles.Based on the analysis of core and high resolution stratigraphic profile records,the stratigraphic structure and seismic reflection data in the area are obtained.The core 120.4 m long shows 16 depositional strata,and its sediments are mainly coarse-grained components.According to the seismic reflection data,the strata in the area can be divided into 6 seismic units,and belong to 3 marine focies strata and 3 continental facies strata,respectively.Similar to those in Core Bc-1,the depositional strata in the area have obvious corresponding relation to the glacial-interglacial cycles,that is,the continental facies strata were formed during the glacial periods,and the marine facies strata were formed during the interglacial periods.The riverine actions were more developed during the glacial periods,and most of riverine deposits were rebuilt by the wind actions.
引文
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[2]Li S L.A preliminary study of foraminifera and Ostracoda assemblages in the Liaodong Bay[J].Acta Scientiarum Naturalium Universi-tatis Pekinensis,1994,30(2):181-193.李淑鸾.辽东湾表层沉积中有孔虫介形虫研究[J].北京大学学报(自然科学版),1994,30(2):181-193.
[3]Wang M T,Zhuang Z Y,et al.Sedimentary characteristics of the shallow buried paleo-channels in the northern central Liaodong Bay andtheir effects on offshore engineering[J].Journal of Oceanography of Huanghai&Bohai Seas,2000,18(2):18-24.王明田,庄振业,等.辽东湾中北部浅层埋藏古河道沉积特征及对海上工程的影响[J].黄渤海海洋,2000,18(2):18-24.
[4]Qin Y S,et al.Geology of the Bohai Sea[M].Beijing:Science Press,1985.秦蕴珊,等.渤海地质[M].北京:科学出版社,1985.
[5]Jin S Z,et al.Marine Environment in the Shallow Sea Oil-Gas Region of Liaohe Oil Field[M].Dalian:Dalian Maritime UniversityPress,1996.金尚柱,等.辽河油田浅海油气区海洋环境[M].大连:大连海事大学出版社,1996.
[6]Li P Y.The coastal zone loess of the Liaodong Peninsula[J].Acta Geologica Sinica,1992,66(1):82-94.李培英.辽东海岸带黄土[J].地质学报,1992,66(1):82-94.
[7]Zhuang Z Y.Quaternary Environmental Evolution[M].Qingdao:Ocean University of Qingdao Press,1999.庄振业.第四纪环境演变[M].青岛:青岛海洋大学出版社,1999.
[8]Xia D X,Liu Z X,et al.A preliminary study on disintegration event of the Yellow River during the last glacicial[J].Oceanologia et Lim-nologia Sinica,1994,25(6):280-289.夏东兴,刘振夏,等.末次冰期黄河解体初探[J].海洋与湖沼,1994,25(6):280-289.
[9]Liang M S and Zhang J L.Correlation Between Onshore and Offshore Quaternary in China[M].Beijing:Science Press,1991.梁名胜,张吉林.中国海陆第四纪对比研究[M].北京:科学出版社,1991.
[10]An Z S,Wu X H,et al.The paleo-monsoon during the last 130 ka in China-II.Variations of the paleo-monsoon[J].Science in China(Ser.B),1991,21(11):1210-1212.安芷生,吴锡浩,等.最近130 ka中国的古季风-II.古季风变迁[J].中国科学(B辑),1991,21(11):1210-1212.
[11]Qin Y S.The evolution and sedimentary process on the continental shelf since the last glacicial period[J].Exploration of Nature,1996,15(5),24-26.秦蕴珊.末次冰期以来陆架环境演化及沉积作用[J].大自然探索,1996,15(5):24-26.
[12]Yu H J.A new exploration of shelf environment during the last stage of Late Pleistocene[J].Transactions of Oceanology and Limnolo-gy,1995,(1):26-32.于洪军.晚更新世末期黄、渤海陆架环境的新探讨[J].海洋湖沼通报,1995,(1):26-32.
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