| 摘要: |
| 1992–1993年用浅地层剖面仪对南黄海中部浅地层进行测量，在70–80m左右的深水区发现了埋藏古三角洲堆积体。结合实测海底地形图及岩芯沉积相资料对浅地层剖面进行综合分析。结果表明，该区域是距今2.7万a左右的黄河河口三角洲，这说明，晚更新世末期黄河已经流入南黄海陆架区，水深70–80m附近曾经发育一期古海岸线。 |
| 关键词: 晚更新世 南黄海 埋藏古三角洲 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，B25940235号 |
附件 |
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| BURIED PALEO-HUANGHE RIVER DELTA IN THE CENTRAL SOUTHERN YELLOW SEA DURING THE LATE PLEISTOCENE |
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LI Fan,ZHANG Xiu-rong,MENG Guang-Lan,HAN Gui-rong
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Institute of Oceanology, The Chinese Academy of Sciences, Qingdao, 266071
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| Abstract: |
| During 1992 - 1993, sub-bottom stratigraphic sequences were measured using Geopulse (ORE) in the central deep water area of the southern yellow sea. The result shows that there are two strong reflection surfaces (T1, T2) and three strata (A, B1, B2) below the seabed. T1 and T2 are located in 1-2m and around 25m below the seabed, respectively. The stratum above T1 represents Holocene marine sediments, between T1 and T2 are terrigenous and transitional facies during the late Pleistocene and below T2 is the middle Pleistocene sediment. A buried paleo-delta characterized by progradational oblique reflection configurations between T1 and T2 was found in the late Pleistocene sequence. The result of core analysis shows that sediment in 0 - 91cm represents a marine stratum deposited in the Holocene, that in 91-1258cm a paleo-deltaic alluvial plain formed during the late Pleistocene and below 125cm a river mouth bar is 26820±2380a B.P. 14C dating. The composition of this paleo-deltaic sediment is similar to the sediment from the Huanghe River. Thus, it is proposed that the buried delta represents the paleo-Huanghe River delta formed during the regressive periods of the late Pleistocene. According to the record, the Huanghe River was not only formed but also flowed on the present-day Yellow Sea Shelf during the late Pleistocene. |
| Key words: Late pleistocene, Southern Yellow Sea, Buried paleo-Huanghe River Delta |
