当前位置: X-MOL 学术Cont. Shelf Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The impact of energetic tropical cyclones (typhoons) on the modern sediment magnetism along the South China coast
Continental Shelf Research ( IF 2.3 ) Pub Date : 2021-05-19 , DOI: 10.1016/j.csr.2021.104447
Mingkun Li , Wenshen Chen , Tingping Ouyang , Chenjian He , Yuxing Kuang , Shasha Peng

Tropical cyclones (TCs) often affect the surface sediments of coastal areas, and impact the sediment imprint. Although the sediment magnetism is sensitive to coastal changes, the understanding of the coastal magnetic minerals’ redistribution affected by TCs is far from adequate. Here, the magnetic and grain-size records from the seafloor sediments along the Leizhou Peninsula coast in South China before and after two violent TCs (Mangkhut and Barijat) occurred in September 2018 are present. The magnetic minerals mainly consist of magnetite, hematite, and goethite. For most sites, the content of hematite increased compared to magnetite and the magnetic minerals became coarser after the TCs subsided, while the amount of fine clay (<2 μm) decreased and the amount of coarse sand (500–2000 μm) increased. This is due to the preferential deposition of the lamellae hematite from the soils and the enhanced hydrodynamic transportation of suspended sediments. The mangrove forest resists the change to a certain degree, especially in the Leizhou Bay. The magnetic and grain-size properties are sensitive to the TC-induced deposits, and provide convincing tools to aid in detecting the paleo-TC activity in tropical coastal regions.



中文翻译:

高能热带气旋(台风)对华南沿海现代沉积物磁学的影响

热带气旋(TCs)通常会影响沿海地区的表层沉积物,并影响沉积物的印记。尽管沉积物磁性对海岸变化敏感,但对受TC影响的海岸磁性矿物重新分布的了解还远远不够。在这里,显示了2018年9月发生两个暴力TC(Mangkhut和Barijat)前后的华南雷州半岛沿岸海底沉积物的磁性和粒度记录。磁性矿物主要由磁铁矿,赤铁矿和针铁矿组成。在大多数地点,赤铁矿的含量比磁铁矿增加,并且在TC消退后,磁性矿物变得更粗糙,而细粘土(<2μm)的数量减少而粗砂(500–2000μm)的数量增加。这是由于片状赤铁矿在土壤中的优先沉积以及悬浮沉积物的水动力传输增加。红树林在一定程度上抵抗了这种变化,特别是在雷州湾。磁性和晶粒度特性对TC诱发的沉积物很敏感,并提供了令人信服的工具来帮助检测热带沿海地区的古TC活性。

更新日期:2021-05-22
down
wechat
bug