西江三角洲岩心中的硅藻及其记录的古环境

兰彬斌; 蓝东兆; 郑志昌; 石学法

西江三角洲岩心中的硅藻及其记录的古环境

1.
国家海洋局, 第三海洋研究所, 海洋与海岸地质环境开放实验室, 福建, 厦门, 361005
2.
国土资源部, 广州海洋地质调查局, 广东, 广州, 510760
3.
国家海洋局, 第一海洋研究所, 海洋沉积与环境地质国家海洋局, 重点实验室, 山东, 青岛, 266061

基金项目: 国家“908”专项专题资助项目(908-02-02-05)

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出版历程
- 收稿日期: 2007-01-04
- 修回日期: 2007-05-21

Diatoms and their palaeoenvironments from the cores of Xijiang Delta in China

1.
Open Laboratory of Coast and Ocean Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
Guangzhou Marine Geological Survey Bureau, Ministry of Land and Resources, Guangzhou 510760, China
3.
Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qindiao 266061, China

摘要

摘要: 通过对西江三角洲ZXZ1,ZXZ2两岩心沉积物样品的硅藻分析,共鉴定出硅藻168种和变种,隶属48个属;ZXZ1岩心可划分为六个硅藻带,ZXZ2岩心可划分为五个硅藻带。根据硅藻组合特征,结合粒度和¹⁴C测年结果,ZXZ1岩心的Ⅳ,Ⅴ,Ⅵ硅藻带和ZXZ2岩心的Ⅲ,Ⅳ,Ⅴ硅藻带属于全新世沉积;ZXZ1岩心的Ⅰ,Ⅱ,Ⅲ硅藻带和ZXZ2岩心的Ⅰ,Ⅱ硅藻带属于晚更新世沉积。分析了晚更新世以来沉积物的沉积相和沉积环境,结果表明,晚更新世时期ZXZ1岩心的沉积物属于近岸低盐海相沉积环境,而ZXZ2岩心的沉积物属于陆相沉积;在全新世时期两岩心均属近岸低盐的海相沉积环境。造成晚更新世时期两岩心沉积相的差异主要与断裂构造的升降运动有关。
- 硅藻 /
- 晚第四纪 /
- 西江三角洲
Abstract: Sedimentary diatoms of Cores ZXZ1 and ZXZ2 collected in the Xijiang Delta were studied.Total of 168 species and variants of diatom species belonging to 48 genera were identified; six bands of Core ZXZ1 and five bands of Core ZXZ2 were classified based on adiatom species property.And stratigraphic subdivision and a correlation analysis were made according to diatomanalysis together with grain-size data and ¹⁴C year data, It is found that 0~11.35 m (including Ⅳ,Ⅴ,Ⅵ diatom bands) of Core ZXZ1 belonged to the Holocene sedimentary, 11.35~35.6 m (including Ⅰ,Ⅱ,Ⅲ diat om bands) belonged to the Late Pleist ocene sedimentary; 0~9.9 m (including Ⅲ, Ⅳ,Ⅴ diatom bands) belonged to the Holocene sedimentary, 9.9~33 m (including Ⅰ, Ⅱ diatom bands) belonged to the Late Pleistocene sedimentary.The sedimentation and environment since Pleistocene have been discussed.Results showed that at the Late Pleist ocene Core ZXZ1 was in marine sedimentary environment, and Core ZXZ2 was in land sedimentary environment; at Holocene the two core were all in marine sedimentary environment.The different sedimentary environments at the Late Pleistocene were mainly due to vertical motion of fault block.
- diatoms /
- Late Quaternary /
- Xijiang Delta in China