Pliocene-Quaternary evolution of the continental shelf of central Vietnam based on high resolution seismic data
Pliocene-Quaternary evolution of the continental shelf of central Vietnam based on high resolution seismic data
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DOI：
10.1016/j.jseaes.2013.08.001
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发表时间：
2014-01-05
影响因子：
3
通讯作者：
Phan Thien Huong
中科院分区：
文献类型：
--
作者：
Mai Thanh Tan;Le Van Dung;Phan Thien Huong
越南中部大陆架的特点是复杂的地质结构，在走滑设置，因此与越南大陆架的其他部分相比，独特的形态。通过对该地区上新世-第四纪沉积物的研究，可以突出显示控制地层演化的过程。本文介绍了越南中部大陆架上新世-第四纪地质演化的高分辨率地震资料的新成果。我们的研究结果demOnstrate越南中部的大陆架是狭窄的，相对于越南大陆架的其他部分。上新世-第四纪陆架的演化受上新世前裂谷作用的控制。然而，在上新世-第四纪期间，除了斜坡中的几个铲式断层外，现今陆架下方的断层系统并不强烈活动。然而，第四纪火山活动广泛发生在近海和陆上，特别是在主要断裂附近。上新世-第四纪沉积根据不整合面划分为7个单元，这些不整合面是与冰川旋回相对应的海退的结果。这一时期的沉积环境包括滨海平原、河流、近岸和陆棚环境。大部分全新世沉积物被困在近岸，而外大陆架的特点是丰富的滞后砾石作为一个快速的海平面上升之间的-20和8 ka。(C)2013爱思唯尔有限公司保留所有权利。
The continental shelf of central Vietnam is characterized by complex geological structures in a strike-slip setting and thus by unique morphology compared to other parts of the Vietnam shelf. Studying the Pliocene-Quaternary sediments in this area allows the processes that control the stratigraphic evolution to be highlighted. In this paper, we prese.nt new results derived from high resolution seismic data that reveal the geological evolution of the continental shelf of central Vietnam during the Pliocene-Quaternary. Our results demOnstrate that the continental shelf of central Vietnam is narrow relatively to other parts of the Vietnam shelf. The evolution of the shelf during the Pliocene-Quaternary was controlled by the pre-Pliocene rifting process. However, fault systems below the present shelf were not strongly active during the Pliocene-Quaternary period, except for several listric faults in the slope. Nonetheless, Quaternary volcanic activities occurred widely both offshore and onshore, especially near the major faults. The Pliocene-Quaternary sedimentary deposits were subdivided into 7 units based on unconformities as result of marine regression corresponding to glacial cycles. Sedimentary environments during this period consist of coastal plain, fluvial, nearshore and shelf environments. Most of the Holocene sediments were trapped nearshore while the outer shelf is characterized by abundant lag gravels as a result of rapid sea level rise between -20 and 8 ka. (C) 2013 Elsevier Ltd. All rights reserved.