东海海底沙脊的结构及沉积环境
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摘要
东海中南部海底分布着广泛的脊槽状地形引起了人们广泛关注 ,有关文献称之谓全新世海进期的潮流沙脊 ;但对于沙脊的内部结构及其沉积环境序列、沙脊的活动性等问题 ,尚无明确结论。根据地震剖面和钻孔柱状样资料 ,对沙脊体的地层结构、沉积环境和沉积时代进行了研究 ,认为海底沙脊群属于海退期三角洲沉积体系 ,目前已被冰后期海进形成的已改造的陆架席状砂所覆盖 ,且不存在沙脊迁移的迹象
In the south of the East China Sea,are widely distributed ridge-trough landforms,which have attracted great attention,and in some documents,they are called Holocene transgressive tidal ridges,but the inner structure,sedimentary succession and movements of the ridges are not yet established.Studies on stratigraphic structures,sedimentary environment and sedimentation history of submarine dune ridges in the East China Sea have indicated the following results. (1) Inner structure and sedimentary succession of the dune ridges are typical of regressive delta on the basis of shallow stratigraphic profile and drilling. (2) Micro-paleontologic and sporopollen data from layerset Ⅱ of the seafloor dune are similar to those of deltaic succession in sedimentary environment. (3) Inner structure of the dune ridges is not consistent with structure and environmental characteristics of tidal dunes.Ridge bodies are not located at the same tidal erosion level.Each body cannot be an independent sedimentary trap and it becomes one successive system together with the underlying strata,surrounding strata and trough strata,and thus cannot be called tidal dunes. (4) After the formation of the submarine dunes,the surficial layers were once reworked by marine dynamic processes,but there are no evidences for their migration and movement.
In the south of the East China Sea,are widely distributed ridge-trough landforms,which have attracted great attention,and in some documents,they are called Holocene transgressive tidal ridges,but the inner structure,sedimentary succession and movements of the ridges are not yet established.Studies on stratigraphic structures,sedimentary environment and sedimentation history of submarine dune ridges in the East China Sea have indicated the following results. (1) Inner structure and sedimentary succession of the dune ridges are typical of regressive delta on the basis of shallow stratigraphic profile and drilling. (2) Micro-paleontologic and sporopollen data from layerset Ⅱ of the seafloor dune are similar to those of deltaic succession in sedimentary environment. (3) Inner structure of the dune ridges is not consistent with structure and environmental characteristics of tidal dunes.Ridge bodies are not located at the same tidal erosion level.Each body cannot be an independent sedimentary trap and it becomes one successive system together with the underlying strata,surrounding strata and trough strata,and thus cannot be called tidal dunes. (4) After the formation of the submarine dunes,the surficial layers were once reworked by marine dynamic processes,but there are no evidences for their migration and movement.
引文
[1] 朱永其,曾成开,冯韵.东海陆架地貌特征[J].东海海洋,1984,2(2).
[2] YANG Chang-shu,SUN jia-song.Tidal sand ridges of theEastChina shelf[A].Tidal-Influenced sedimentaryEnviron-ments andFacies[C].1988.
[3] 杨长恕.港辐射沙脊成因探讨[J].海洋地质与第四纪地质,1985,5(3):35-44.
[4] CHANG-shuYang.Active moribund and buried tidal sandridges in theEastChinaSea andSouthernYellowSea[J].Ma-rineGeology1989,88:97-116.
[5] LIU Zhen-xia,SergeBerne.Paleoenvironments and sedim enta-tion of theEastChinaSea[A].Collection ofDonghai results ofjointChinese andFrench study[C].1999,1-50.
[6] 黄慧珍,唐保根,杨文达,等.长江三角洲沉积地质学[M].北京:地质出版社,1996.27-180.
[7] 杨文达,陈中原,丁培民.长江水下三角洲区沉积相序及其发育特征[J].水文地质工程地质论丛,1987,(2):191-204.
[8] 王开发,等.东海大陆架海底泥炭层孢粉、藻类组合与海面变化[J].海洋地质研究,1981,1(1):57-68.
[9] H G里丁.沉积环境和相[M].1985.54,275.
[10] 许世运,王靖泰,李萍.论三角洲发育的阶段性[A].长江三角洲现代沉积研究[M].上海:华东师范大学出版社,1987.264-277.
[11] 杨文达.长江口外陆架砂的形成时代与沉积动力特征[J].海洋地质与第四纪地质,1983,3(2):41-49.
[12] 朱永其,曾成开,金长茂.东海陆架地貌的初步研究[A].东海研究文集[C].北京:海洋出版社,1984.82-93.
[2] YANG Chang-shu,SUN jia-song.Tidal sand ridges of theEastChina shelf[A].Tidal-Influenced sedimentaryEnviron-ments andFacies[C].1988.
[3] 杨长恕.港辐射沙脊成因探讨[J].海洋地质与第四纪地质,1985,5(3):35-44.
[4] CHANG-shuYang.Active moribund and buried tidal sandridges in theEastChinaSea andSouthernYellowSea[J].Ma-rineGeology1989,88:97-116.
[5] LIU Zhen-xia,SergeBerne.Paleoenvironments and sedim enta-tion of theEastChinaSea[A].Collection ofDonghai results ofjointChinese andFrench study[C].1999,1-50.
[6] 黄慧珍,唐保根,杨文达,等.长江三角洲沉积地质学[M].北京:地质出版社,1996.27-180.
[7] 杨文达,陈中原,丁培民.长江水下三角洲区沉积相序及其发育特征[J].水文地质工程地质论丛,1987,(2):191-204.
[8] 王开发,等.东海大陆架海底泥炭层孢粉、藻类组合与海面变化[J].海洋地质研究,1981,1(1):57-68.
[9] H G里丁.沉积环境和相[M].1985.54,275.
[10] 许世运,王靖泰,李萍.论三角洲发育的阶段性[A].长江三角洲现代沉积研究[M].上海:华东师范大学出版社,1987.264-277.
[11] 杨文达.长江口外陆架砂的形成时代与沉积动力特征[J].海洋地质与第四纪地质,1983,3(2):41-49.
[12] 朱永其,曾成开,金长茂.东海陆架地貌的初步研究[A].东海研究文集[C].北京:海洋出版社,1984.82-93.
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