| 摘要: |
| 应用“向阳红16号”1992年地质调查和“向阳红9号”1995年地球物理调查的实际资料,并参照80年代以来有关研究成果,对冲绳海槽沉积物类型、陆源组分的堆积形式、沉积速率、物质通量以及沉积环境状况等进行了研究。结果表明,冲绳海槽陆源碎屑主要集中在海底峡谷口外,形成海底扇沉积。海底扇以其与峡谷伴生而地势和缓、陆源组分含量高、沉积通量大、沉积物楔入体复合叠置为标志,揭示出海底峡谷在陆源碎屑向海槽输送过程中的通道作用;提出陆架潮流与海底峡谷内波、内潮汐的联合作用是陆源碎屑经峡谷通道向海槽持续搬运的主要动力因素,而黑潮摆动及其涡旋分支对峡谷上游沉积物的供给具有积极作用。 |
| 关键词: 冲绳海槽 陆源沉积 峡谷通道 海底扇 |
| DOI： |
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| 基金项目:国家“八五”科技攻关项目,85-904-03-02号、85-904-04-02号 |
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| TERRIGENOUS TRANSPORTATION THROUGH CANYON AND SEDIMENTATION OF SUBMARINE FAN IN THE OKINAWA TROUGH |
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LI Wei-Ran1, YANG Zuo-Sheng1, WANG Qi1, CAO Li-Hua1, WANG Yong-Ji2, WANG Xian-Lan3
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1.College of Marine Geosciences, Ocean University of Qingdao, Qingdao 266003;2.The First Institute of Oceanography, State Oceanic Administration, Qingdao 266003;3.The Second Institute of Oceanography, SOA, Hangzhou 310012
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| Abstract: |
| Factual materials from R/V Xiangyanghong 16 geological survey in 1992 and R/V Xiangyanghong 9 geophysical survey in 1995 were used, together with the referred achievements in research of relevant areas since 1980, for a study on sediment distributions, terrigenous accumulation form, sedimentation rates, fluxes and sedimentary environment in the Okinawa Trough. The result shows that terrigenous debris into the Okinawa Trough has being accumulated mainly outside the submarine canyon mouths to form submarine fans, which are characterized by high terrigenous constituent, high fluxes, interdigitally superimposed sediment wedges and flattish relief associated with submarine canyons, bringing to light the passage function of submarine canyon transporting terrigenous debris into the trough. It is suggested that a joint function of tidal movement on the continental shelf and internal wave, internal tide in the canyons is a key mechanism of terrigenous transport into the trough, the Kuroshio seasonal swinging and its vortex current branches are taking an active part in applying sediments to the upper canyons. |
| Key words: Okinawa Trough, Terrigenous sedimentation, Canyon passage, Submarine fan |
