摘要
根据台湾海峡西部10个柱102个样品的X 射线衍射等分析,鉴定了该区粘土矿物组合与含量变化,分析了其与沉积环境的关系.结果表明,该区粘土矿物组合大多数站位以伊利石含量占首位,绿泥石和高岭石次之,且含少量蒙脱石;伊利石含量随距岸、水深的增加而递增,高岭石则反之;蒙脱石含量与火山活动密切相关,绿泥石含量呈斑块状分布;775和819号站有典型的陆相层,为早玉木冰期的“台湾陆桥”或“东山陆桥”提供有力证据.
The clay mineral association in sediment cores from the western Taiwan Strait is dominated by il-lite followed by chlorite and kaolinite,and a small amount of montmorillonite,except for the terrestri-al sediment in which kaolinite is predominant.The changes of clay mineral content are closely related to material sources and controlled by thedilution in between clay minerals.With increasing distance from coast and water depth,there is a in-creasing trend for illite content.On the contrary,kaolinite content decrease with increasing distancefrom coast and water depth,as well as the climatic cooling.Montmorillonite content is closely boundup with the volcanic activities.The intense volcanic activities in the glacial period led to the high con-tent of montmorillinite.The changes of clay mineral content in sediment cores comfirm the changes of sedimentary envi-ronment such as the growth and decline of glaciation,the fluctuations of climate,and the changes ofwater depth and distance from coast.The kaolinite contents are 41.9% and 40.8% respectively for 260～265cm in Core 775 and251～256cm in Core 819.They are distinct terrestrial sediments formed in Early Dali Glaciation(Early Wurm Glaciation)according to ^(14)C dating.At that time,the Taiwan Strait emerged to formthe so-called “Dongshan Land-bridge”.
出处
《台湾海峡》
CAS
CSCD
1993年第1期1-7,共7页
Journal of Oceanography In Taiwan Strait
基金
国家自然科学基金资助项目4880122号
关键词
海底
沉积物
柱状
粘土矿物
Submarine core sediment
clay mineral
Taiwan Strait
