深水环境多级地貌坡折控制下的重力流动力学的演变
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国家自然科学基金项目(面上项目,重点项目,重大项目)


The Control of the Multiple Geomorphologic Breaks on Evolution of Gravity Flow Dynamics in Deep-Water Environment
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    摘要:

    台湾浅滩陆坡具有活跃的重力流机制,发育了壮观的重力流沉积体系,是研究重力流动力学作用过程的理想场所。自陆架前缘直至深海的马尼拉海沟,发育了三个地貌坡折(包括一个陆架坡折和两个陆坡坡折)。这些地貌坡折控制了重力(流)的启动和整个演化过程,控制了各种重力流沉积体系的空间分布格局。其中陆架坡折控制了重力滑塌的产生,第一和第二陆坡坡折则分别控制了重力滑塌体、碎屑流、浊流的转换。论文利用重力流沉积物波的波形参数恢复了重力流流体有关参数,实证了研究区的确存在有非常活跃的重力流机制。而多级地貌坡折代表着陆坡地貌的不均衡和向均衡的演化,重力流的侵蚀-沉积效应只是陆坡体系调整过程的表现。

    Abstract:

    Gravity flow was active in Taiwan Shoal Slope and deposited the spectacular correspondingly deposition system, and so been the perfect area of the study on process of the gravity flow. At least three geomorphologic breaks including one shelf break and two slope break exist from shelf front to abyssal Manila Trench. These breaks control the initiation and completely evolution of the gravity flow and control the distributing framework of kinds of gravity-flow-deposited system. Among them the shelf break control the initiation of the mass waste and the first and second slope break control transformation between slump, debris flow and turbidity flow respectively. After utilizing the parameters of waveform of sediment wave the correspondingly rheology of gravity flow was reconstructed and assert the existence of the actively gravity flow. The multiple breaks mark the unequilibrium of the slope system and the slope profile’s evolution to the equilibrium, so the effect of erosion-deposition of gravity flow is only the superficial expression of the adjustment of the slope system.

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王海荣,王英民,邱燕,彭学超,王志宏.2009.深水环境多级地貌坡折控制下的重力流动力学的演变[J].地质学报,83(6):812-819.
WANG Hairong, WANG Yingmin, QIU Yan, PENG Xuechao, WANG Zhihong.2009. The Control of the Multiple Geomorphologic Breaks on Evolution of Gravity Flow Dynamics in Deep-Water Environment[J]. Acta Geologica Sinica,83(6):812-819.

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  • 收稿日期:2008-08-06
  • 最后修改日期:2008-10-28
  • 录用日期:2009-02-06
  • 在线发布日期: 2009-06-03
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