南京大学学报（自然科学版）
南京大學學報（自然科學版）
남경대학학보（자연과학판）
JOURNAL OF NANJING UNIVERSITY(NATURAL SCIENCES)
2014年
5期
564-575
,共12页
王羽涵%殷勇%夏非%邹欣庆
王羽涵%慇勇%夏非%鄒訢慶
왕우함%은용%하비%추흔경
辐射沙脊群%潮流通道%环境演变%14 C测年%光释光测年%南黄海
輻射沙脊群%潮流通道%環境縯變%14 C測年%光釋光測年%南黃海
복사사척군%조류통도%배경연변%14 C측년%광석광측년%남황해
radial tidal sand ridge field%tidal channel%environmental change%14 C dating%OSL dating%southern Yellow Sea
通过分析南黄海辐射沙脊群苦水洋海域铁板沙11DT06钻孔的沉积相序列、14 C 测年数据、粒度特征及其沉积环境意义,并与该海域北翼潮流通道11 DT01孔、里磕脚11 DT02孔对比,重建了 MIS 3阶段以来苦水洋海域的环境演变过程.铁板沙11 DT06孔自上而下揭示了4个沉积序列：S1(潮流沙脊层)、S2(潮滩层)、S3(陆相硬黏土层)和 S4(高潮滩层).MIS 3阶段以来苦水洋海域经历了潮滩(ca.44~25 ka BP)、洪泛平原(陆相硬黏土层,ca.25~12 ka BP)、滨岸沼泽与潮滩(ca.12~7 ka BP)和水下沙脊潮流通道(ca.7 ka BP 至今)等一系列环境演变过程.铁板沙潮流沙脊主要由细砂和粉砂质细砂组成,而 MIS 3阶段与早全新世的潮滩沉积主要由黏土质粉砂和粉砂质黏土组成,分选性总体都较差,基本都为正偏态,表明沉积物粒度分布都存在细尾部分,这正是潮流沉积物的一大特点,与洪泛平原相的硬黏土层存在明显差异,指示了主控沉积动力环境的不同.苦水洋海域三个钻孔测试获得的11个 AMS 14 C和2个 OSL测年数据显示了海陆交互作用强烈地区测年结果的复杂性与不确定性.
通過分析南黃海輻射沙脊群苦水洋海域鐵闆沙11DT06鑽孔的沉積相序列、14 C 測年數據、粒度特徵及其沉積環境意義,併與該海域北翼潮流通道11 DT01孔、裏磕腳11 DT02孔對比,重建瞭 MIS 3階段以來苦水洋海域的環境縯變過程.鐵闆沙11 DT06孔自上而下揭示瞭4箇沉積序列：S1(潮流沙脊層)、S2(潮灘層)、S3(陸相硬黏土層)和 S4(高潮灘層).MIS 3階段以來苦水洋海域經歷瞭潮灘(ca.44~25 ka BP)、洪汎平原(陸相硬黏土層,ca.25~12 ka BP)、濱岸沼澤與潮灘(ca.12~7 ka BP)和水下沙脊潮流通道(ca.7 ka BP 至今)等一繫列環境縯變過程.鐵闆沙潮流沙脊主要由細砂和粉砂質細砂組成,而 MIS 3階段與早全新世的潮灘沉積主要由黏土質粉砂和粉砂質黏土組成,分選性總體都較差,基本都為正偏態,錶明沉積物粒度分佈都存在細尾部分,這正是潮流沉積物的一大特點,與洪汎平原相的硬黏土層存在明顯差異,指示瞭主控沉積動力環境的不同.苦水洋海域三箇鑽孔測試穫得的11箇 AMS 14 C和2箇 OSL測年數據顯示瞭海陸交互作用彊烈地區測年結果的複雜性與不確定性.
통과분석남황해복사사척군고수양해역철판사11DT06찬공적침적상서렬、14 C 측년수거、립도특정급기침적배경의의,병여해해역북익조류통도11 DT01공、리개각11 DT02공대비,중건료 MIS 3계단이래고수양해역적배경연변과정.철판사11 DT06공자상이하게시료4개침적서렬：S1(조류사척층)、S2(조탄층)、S3(륙상경점토층)화 S4(고조탄층).MIS 3계단이래고수양해역경력료조탄(ca.44~25 ka BP)、홍범평원(륙상경점토층,ca.25~12 ka BP)、빈안소택여조탄(ca.12~7 ka BP)화수하사척조류통도(ca.7 ka BP 지금)등일계렬배경연변과정.철판사조류사척주요유세사화분사질세사조성,이 MIS 3계단여조전신세적조탄침적주요유점토질분사화분사질점토조성,분선성총체도교차,기본도위정편태,표명침적물립도분포도존재세미부분,저정시조류침적물적일대특점,여홍범평원상적경점토층존재명현차이,지시료주공침적동력배경적불동.고수양해역삼개찬공측시획득적11개 AMS 14 C화2개 OSL측년수거현시료해륙교호작용강렬지구측년결과적복잡성여불학정성.
Based on the analysis of sedimentary facies,14C dating results,characteristics of grain size and its environmental implication of core 11DT06,which is in the Kushuiyang area of radial sand ridge field,southern Yellow Sea,and stratigraphic correlation between core 11DT06 and adjacent cores(i.e.,core 11DT01 and 11DT02), we reconstructed the progression of environmental changes in the Kushuiyang area since MIS 3.Core 11DT06 revealed four sedimentary sequences from top to bottom(i.e.,S1,tidal sand ridge layer;S2,tidal flat layer;S3, terrigenous stiff mud layer;S4,upper tidal flat layer).The Kushuiyang area experienced a series of environmental changes mainly controlled by sea level changes since MIS 3,which included tidal flat(ca.44~25 ka BP),river flood plain(terrigenous stiff mud layer,ca.25~12 ka BP),coastal marsh and tidal flat(ca.12~7 ka BP),and subaqueous sand ridge-tidal channel(ca.7 ka BP to present)environments.The Tiebansha tidal sand ridge(i.e.,the site of core 11DT06)was mainly composed of fine sand and silty fine sand,while the MIS 3 and early Holocene tidal flat deposits were mainly composed of clayey silt and silty clay.These deposits generally had poor sorting and positive skewness, showing that there was fine sediments in the grain size distribution,which was a major feature of tidal sediments. These characteristics of grain size parameters were obviously different between tidal sediments and stiff mud layers of river flood plain facies,indicating the discrepancy in terms of dynamic sedimentary environments.Eleven AMS 14 C and two OSL dating results of three cores in the Kushuiyang area showed the complexity and uncertainty of late Quaternary datings recovered from the intensive land-sea interaction areas again.
