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本文对位于南海西部深海平原的SA14-34岩心进行详细的沉积物组分研究,结果表明:该岩心岩性复杂多变,沉积了粘土、粉砂质粘土、砂质粘土、粘土质粉砂、砂质粉砂、砂和粉砂质砂等7种沉积物类型。浊流沉积发育,至少已识别出4个特征明显的浊流层。浊流层厚度为18～120 cm,具有粒度较粗呈下粗上细、异地钙质微体生物化石丰富、陆源碎屑矿物含量高、SiO_2/Al_2O_3比值和CaCO_3含量高四大特点。并对浊流沉积的物质来源、成因进行了初步分析,认为浊积物主要来自西部陆架-陆坡区,有利的地形、丰富的物源和频繁的海底火山活动诱发的地震是浊流发生的主要原因。
In this paper, the detailed sediment composition of SA14-34 core located in the deep sea of the western South China Sea is studied. The results show that the lithology of the core is complex and changeable, clay, silty clay, sandy clay, clayey silt, Sandy silt, sand and silty sand 7 kinds of sediment types. Turbidite sediments are well developed and at least 4 distinctly turbid layers have been identified. The thickness of turbidity layer is 18 ~ 120 cm. It has the features of coarse and fine coarse grains, rich calcareous fossils in different places, high content of terrigenous detrital minerals, high SiO 2 / Al 2 O 3 ratio and high CaCO 3 content. The origin and origin of the turbidity flow are also analyzed. It is concluded that the turbidity mainly comes from the western shelf-slope area. The favorable terrain, abundant provenance and frequent seabed volcanic activity are the main causes of turbidity the reason.