| 北大西洋洛克尔海槽东北部内波沉积--深水大型沉积物波成因的再解释 |
| |
| 引用本文： | 张兴阳,高振中,姚雪根.北大西洋洛克尔海槽东北部内波沉积--深水大型沉积物波成因的再解释[J].沉积学报,1999,17(3):464-472. |
| |
| 作者姓名： | 张兴阳 高振中 姚雪根 |
| |
| 作者单位： | 1 江汉石油学院地质系 湖北荆州 434102; |
| |
| 摘 要： | 北大西洋洛克尔海槽东北部水深约1 000～ 1 000 m 处有两个大型沉积物波发育区。波长1 ～ 2 km，波高18 ～ 20 m，分布面积分别为350 km 2 与 20 km 2。沉积物波向上坡迁移，内部包括上攀床形单元、不对称波形单元及正弦波形单元。前人提出的大区沉积物波挪威海底层水溢流成因及小区沉积物Lee波迁移模式都存在许多问题。根据古气候及古洋流资料，研究区内沉积物波各单元形成时具备内波形成的条件，内波的发育与等深流的活动密切相关。运用内波理论可对沉积物波各构成单元作出合理的水动力学解释，研究区内两列同向内波的叠加、单列内波及内驻波先后作用海底，可分别形成大型上攀床形、不对称波形及正弦波形单元。
|
| 关 键 词： | 洛克尔海槽 内波沉积 深水沉积物波 等深流 冰期 |
| 收稿时间： | 1998-03-04 |
Internal-wave Deposits in the North-eastern Rockall Trough,North Atlantic Ocean--Reinterpretation of deep-water sediment waves formation |
| |
| ZHANG Xing-yang,GAO Zhen-zhong,YAO Xue-gen.Internal-wave Deposits in the North-eastern Rockall Trough,North Atlantic Ocean--Reinterpretation of deep-water sediment waves formation[J].Acta Sedimentologica Sinica,1999,17(3):464-472. |
| |
| Authors: | ZHANG Xing-yang GAO Zhen-zhong YAO Xue-gen |
| |
| Institution: | 1 Geoglogy Department of Jiang han Petrdeum Institute,Jingzhou Hubei 434102;2 Manager Department of Nature Gas Exploration Project of Sichuan and Hubei,Wanxian Sichuan 634000 |
| |
| Abstract: | Tow sediment wave fields are developed in a depth zone of about 1 000 1 100m in the north eastern Rockall Trough.Their wavelengths vary from 1 to 2 km and waveheights from 18 to 20 m,covering area of 350km 2 and 20km 2 respectively.Sedment waves migrate upslope and include generally an upslope climbing,asymmetry upslope and sinusoidal shape in stratigraphic section.The conclusions proposed by former scholars that sediment waves of large area were formed by the overflow moving from the Norwegian Ses and the Lee Wave modle has caused the upslope migration of the sediment waves of small area have many problems.Considering the paleoclimate and paleocirculation,internal waves coul be generated in study area while every unit of the sediment waves was being formed.The formation of internal waves is related to contour currents closely.Resonnable hydrolic mechanism of sediment waves formation can be obtained accord ing to the theory of internal wave.Generated under different paleoclimatic and paleocirculative conditions,the combining of two internal waves propagating toward the same direction,unique internal wave and internal stand wave which inter sected sea floor successively would form a general basal climbing,intermidiate asymmetric and upper sinusoidal shape in stratigraphic section. |
| |
| Keywords: | Rokall Trough internal wave deposits deep water sediment waves contour current ice age |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
