东海陆架两期沙脊的时空对比

吴自银; 金翔龙; 曹振轶; 李家彪; 郑玉龙; 尚继宏

东海陆架两期沙脊的时空对比

1.
国家海洋局第二海洋研究所, 浙江杭州 310012;国家海洋局第二海洋研究所海底科学国家海洋局重点实验室, 浙江杭州 310012;浙江大学地球科学系, 浙江杭州 310028
2.
国家海洋局第二海洋研究所海底科学国家海洋局重点实验室, 浙江杭州 310012
3.
国家海洋局第二海洋研究所, 浙江杭州 310012;国家海洋局第二海洋研究所海底科学国家海洋局重点实验室, 浙江杭州 310012

基金项目: 国家自然科学基金;“九○八”专项资助项目(908-ZC-I-07;908-ZC-II-05)

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出版历程
- 收稿日期: 2008-11-11
- 修回日期: 2009-05-06

Space-time contrast of two stages sand ridges on the East China Sea shelf

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of State Oceanic Administration for Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310028, China
2.
Key Laboratory of State Oceanic Administration for Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of State Oceanic Administration for Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 基于高分辨率的单道地震和多波束测深数据,识别并对比了东海陆架中部同一海区相距20余万年的层U₁₄和层U₂两期沙脊群,其中层U₁₄期沙脊属于埋藏沙脊,位于东海海底以下90m深处,推测属于距今320~200ka的海侵体系域(TST),沙脊顶界面是该期海侵的最大洪泛面(MFS);层U₂期沙脊位于东海陆架,属于衰退沙脊,系末次盛冰期(LGM)以来的TST,顶界面是LGM以来的MFS。尽管两期沙脊形成年代相距20余万年,地层层位相距近90m,但是沙脊群总体走向一致,表明距今2×10⁵/a以来东海陆架潮波基本格局稳定。从层U₂期可识别出4个亚期沙脊,通过多波束海底地形图可识别出4组走向的沙脊,多亚期、多走向沙脊是LGM以来海平面阶梯状波动在海底地形演变过程中的响应证据。
- 东海陆架 /
- 埋藏沙脊 /
- 衰退沙脊 /
- 精细结构 /
- 多波束测深
Abstract: On the basis of the high-resolution single-channel sparker seismic profiles and MBES (multibeam echo sounding),the LSRs (linear sand ridges) on Stratum U₂ and Stratum U₁₄ on the ECS (East China Sea) shelf are identified and contrasted each other,their form ages are different,more than 200 ka.The sand ridges on Stratum U₁₄ which is bellow seafloor 90 m are buried sand ridges,and belong to TST (transgressive systems tract) of 320~200 ka BP,and the upper bounding surfaces of the sand ridge units are therefore considered as the MFS (maximum flooding surface) of this transgressive.The sand ridges on Stratum U₂ are recessive sand ridges,which have belonged to the TST since the LGM (last glacial maximum),and their upper bounding surfaces are the MFS of the LGM.Although the form ages of two sand ridge units are different,more than 200 ka,and their stratigraphy positions are different,more than 90 m,the general strikes of sand ridges are similar.It is suggested that the palaeo-tidal components of the ECS have been steady since 200 ka.Four substages sand ridges are identified from the stratig raphy of Stratum U₂,and four trends of sand ridges are distinguished from the topogr aphic map of the MBES too.These multistages and multitrend sand ridges are the evidences that the evolution of submarine to pography of the ECS has met the response of sea-level stepped changes since the LGM.
- East China Sea shelf /
- buried sand ridges /
- recessive sand ridges /
- fine structures /
- multibeam echo sounding

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