| 深水单向迁移水道建造模式与成因机制研究进展* |
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| 引用本文： | 周伟.深水单向迁移水道建造模式与成因机制研究进展*[J].古地理学报,2021,23(6):1082-1093. |
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| 作者姓名： | 周伟 |
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| 作者单位： | 1.成都理工大学能源学院,四川成都 610059;2.油气藏地质及开发工程国家重点实验室,成都理工大学,四川成都 610059 |
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| 基金项目： | *国家自然科学基金项目(编号: 42002125)资助。 |
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| 摘 要： | 深水水道是发育于大陆坡—海底平原的一种常见地貌。单向迁移水道是深水水道中的一种特殊类型,其成因主要源于垂直陆坡走向浊流与平行陆坡走向底流(即等深流)的交互作用。单向迁移水道的迁移—建造特征目前存在2种截然不同的模式。其一为下游迁移模式,即水道顺着等深流的流动方向单向迁移,该模式下水道建造特征表现为非对称“U”形或“V”形剖面形态、顺直—低弯度平面特征、外堤岸缺乏,以水道内的侵蚀—充填建造为主。其二为上游迁移模式,即水道向等深流的来源方向单向迁移,该模式下水道建造特征表现为非对称“鸥翼”状剖面形态、低—高弯度平面特征、外堤岸单侧较发育,以水道—堤岸建造为主。这2种截然不同的迁移—建造特征表明交互作用成因的深水单向迁移水道的形成机制及古海洋学意义目前还存在较大争议。现代化的重力流与底流交互作用模拟实验(如数值模拟、水槽模拟)、地质露头分析和近海底流体原位观测可能是解决该争议的最有力手段。
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| 关 键 词： | 深水单向迁移水道 浊流 等深流 交互作用 模拟实验 |
| 收稿时间： | 2021-03-01 |
Research progress on architectural patterns and formation mechanisms of deep-water unidirectionally migrating channels |
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| Zhou Wei.Research progress on architectural patterns and formation mechanisms of deep-water unidirectionally migrating channels[J].Journal of Palaeogeography,2021,23(6):1082-1093. |
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| Authors: | Zhou Wei |
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| Institution: | 1.College of Energy,Chengdu University of Technology,Chengdu 610059,China;2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China |
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| Abstract: | Deep-water channels are a common topography developed on continental slopes-submarine plains. Unidirectionally migrating channels(UMCs)are a special type of deep-water channels,which are mainly caused by the interaction of the down-slope turbidity currents with along-slope bottom currents(i.e. contour currents). There are currently two distinct patterns in the migration-architecture characteristics of UMCs. The first is the downstream migration pattern,where the channel migrates unidirectionally in the direction of the contour current,and is characterized by an asymmetric‘U’or‘V’ shaped channel profile,a straight to low-sinuosity plan form,and a predominance of intra-channel erosion-infill construction lacking of bilateral outer levees. The second is the upstream migration pattern,where the channel migrates unidirectionally in the direction of the source of the contour current,which is characterized by an asymmetrical‘gull-wing shaped’ channel profile,a low-to high-sinuosity plan form,and is dominated by the channel-levee construction with a single, more developed outer levee. These two distinct migration-architecture characteristics suggest that the formation mechanisms and the paleoceanographic significance of deep-water UMCs of interacting origin are still highly controversial. Interaction simulation experiments of modern gravity flows and bottom currents(e.g.,flume-tank experiments and numerical simulations),geological outcrop analyses,and in-situ near-seafloor flow monitoring may be the most powerful tools of resolving these controversies. |
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| Keywords: | deep-water unidirectionally migrating channel turbidity flow contour current interaction simulation experiment |
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