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摘要:
通过桑沟湾周边海域高分辨率浅地层剖面的地质解译，结合典型钻孔沉积地层的对比分析，揭示了研究区晚更新世以来的层序地层序列。研究表明，桑沟湾周边海域晚更新世以来的地层上覆于基岩之上，自下而上识别出了具有层序意义的3个声学地层单元（SU2、SU1-2、SU1-1），与钻孔的3个沉积地层单元（DU2、DU1-2、DU1-1）对应性良好。桑沟湾周边海域晚更新世以来的层序序列，形成于末次冰盛期低海面时期及早—中全新世高海面以来，自下而上包括低水位体系域（河流-河道充填相沉积）、海侵体系域（潮流沙脊与滨海相沉积）、高水位体系域（浅海相沉积）。研究区低水位体系域受河流下切侵蚀作用，沉积厚度变化较大，介于0～15 m；海侵体系域的沉积厚度普遍介于4.5～5.5 m，分布广泛；高水位体系域由岸向海，自西南至东北沉积厚度逐渐增加，最厚处超过30 m。
Abstract:High-resolution seismic reflection data and depositional stratigraphy of typical cores were studied in detail to determine the sequence stratigraphy since the Late Pleistocene around the Sanggou Bay off Rongcheng in Shandong Peninsula. Results show that the Late Pleistocene strata above bedrock in the study area could be subdivided into three seismic units (SU2, SU1-2, SU1-1 in descending order), and they are well corresponded to three depositional units (DU2, DU1-2, DU1-1) of borehole. The sediment sequence covered deposits during the sea-level lowstand of LGM and the sea-level highstand of early-middle Holocene, comprising lowstand systems tract (LST) (deposits of fluvial to incised-channel filling facies), transgressive systems tract (TST) (deposits of tidal sand ridges and littoral facies); and the highstand systems tract (HST) (deposits of neritic facies since). The LST varies considerably in thickness of 0～15 m due to river erosion, while the TST is widely distributed in the thickness of 4.5～5.5 m, and the HST gradually thickens seaward from SW to NE with a maximum thickness of more than 30 m in the study area.
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表 1 研究区晚更新世以来层序地层划分表
Table 1. Sequence stratigraphy since the late Pleistocene in the study area
地层年代 氧同位素期次 地层底界面 地层单元 体系域 沉积相 全新世 MIS1 R1（最大海泛面） SU1-1 高水位体系域 浅海相 R2（海进侵蚀面） SU1-2 海侵体系域 滨海相 晚更新世 MIS2 R3（层序界面） SU2 低水位体系域 河流-河流充填相 
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[1] LIU J P,MILLIMAN J D,GAO S,et al. Holocene development of the Yellow River's subaqueous delta,North Yellow Sea[J]. Marine Geology,2004,209:45-67. doi: 10.1016/j.margeo.2004.06.009
[2] LIU J,SAITO Y,KONG X H,et al. Delta development and channel incision during marine isotope stages 3 and 2 in the western South Yellow Sea[J]. Marine Geology,2010,278:54-76. doi: 10.1016/j.margeo.2010.09.003
[3] YANG Z S,LIU J P. A unique Yellow River-derived distal subaqueous delta in the Yellow Sea[J]. Marine Geology,2007,240:169-176. doi: 10.1016/j.margeo.2007.02.008
[4] 仇建东,张勇,孔祥淮,等. 山东半岛南部滨浅海区晚第四纪声学地层[J]. 海洋地质与第四纪地质,2015,35(2):1-10.
[5] YANG J C,LI G X,LIU Y,et al. Evolution of sedimentary mode since Pleistocene in the central South Yellow Sea,China,based on seismic stratigraphy analysis[J]. Quaternary International,2018,482(20):157-170.
[6] LIU J, ZHANG X H, MEI X, et al. 2018. The sedimentary succession of the last ～3.50 Myr in the western South Yellow Sea: paleoenvironmental and tectonic implications[J]. Marine Geology, 399: 47-75.
[7] LIU J,SAITO Y,WANG H,et al. Sedimentary evolution of the Holocene subaqueous clinoform off the Shandong Peninsula in the Yellow Sea[J]. Marine Geology,2007,236(3/4):165-187.
[8] 汪品先, 章纪军, 赵泉鸿, 等. 东海底质中的有孔虫和介形虫[M]. 北京: 海洋出版社, 1988.1-307.
[9] 王飞飞,丁璇,刘健. 南黄海西部陆架氧同位素3期以来的古沉积环境演化[J]. 微体古生物学报,2012,29(3):235-252.
[10] 陈晓辉,李日辉,孙荣涛,等. 末次冰消期以来辽东半岛东南近岸泥质区的古环境演化[J]. 第四纪研究,2016,36(6):1489-1501.
[11] 汪品先, 闵秋宝, 卞云华. 黄海有孔虫、介形虫组合的初步研究[C]. 海洋微体古生物论文集. 北京: 海洋出版社, 1980. 84-100.
[12] 陈晓辉, 李日辉, 蓝先洪, 等. 渤海西部晚第四纪地层层序特征及沉积响应[J]. 地球科学, 2020, 45（7）: 2684-2696
[13] 陈晓辉, 孟祥君, 李日辉. 辽东湾晚第四纪层序地层[J]. 海洋地质与第四纪地质, 2020, 40（2）: 37-47.
[14] LI G X,LI P,LIU Y,et al. Sedimentary system response to the global sea level change in the East China Seas since the last glacial maximum[J]. Earth-Science Reviews,2014,139:390-405. doi: 10.1016/j.earscirev.2014.09.007
[15] 李凡,于建军,姜秀珩,等. 南黄海埋藏古河系研究[J]. 海洋与湖沼,1991,22(6):501-508.
[16] BERNÉ S,VANGER P,GUICHARD F,et al. Pleistocene forced regressions and tidal sand ridges in the East China Sea[J]. Marine Geology,2002,188:293-315. doi: 10.1016/S0025-3227(02)00446-2
[17] CHAPPELL J,OMURA A,ESAT T,et al. Reconciliaion of late Quaternary sea levels derived from coral terraces at Huon Peninsula with deep sea oxygen isotope records[J]. Earth and Planetary Science Letters,1996,141(1/4):227-236.
[18] LEA D W,MARTIN P A,PAK D K,et al. Reconstructing a 350 ky history of sea level using planktonic Mg/Ca and oxygen isotope records from a Cocos Ridge core[J]. Quaternary Sciences Reviews,2002,21:283-293. doi: 10.1016/S0277-3791(01)00081-6
[19] 蓝先洪,张宪军,赵广涛,等. 南黄海NT1孔沉积物稀土元素组成与物源判别[J]. 地球化学,2009,38(2):123-132.
[20] YOO D G,CHANG T S,LEE G S,et al. Late Quaternary seismic stratigraphy in response to postglacial sea-level rise at the mid-eastern Yellow Sea[J]. Quaternary International,2016,392:125-136. doi: 10.1016/j.quaint.2015.07.045
[21] WANG Z B,YANG S Y,WANG Q,et al. Late Quaternary stratigraphic evolution on the outer shelf of the East China Sea[J]. Continental Shelf Research,2014,90:5-16. doi: 10.1016/j.csr.2014.04.015
[22] CHEN X H,LI R H,LAN X H,et al. Stratigraphy of late Quaternary deposits in the mid-western North Yellow Sea[J]. Journal of Oceanology and Limnology,2018,36(6):2130-2153. doi: 10.1007/s00343-019-7146-9
[23] LOBO F J, RIDENTE D.Stratigraphic architecture and spatio-temporal variability of high-frequency （Milankovitch） depositional cycles on modern continental margins: an overview[J]. Marine Geology, 2014, 352: 215-247.
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