摘要
基于普里兹湾西北侧海域ANT29-P4-03沉积岩心14 C测年和黏土矿物含量的分析结果,讨论了研究区黏土矿物组分的气候环境意义。黏土矿物含量顺序为伊利石〉蒙脱石〉高岭石〉绿泥石。蒙脱石主要来自火成岩风化,在26.0~26.5、25.3~25.6、25.0、16.5~17.0ka 4个时间段含量较高,总体呈现冰期高间冰期低的特点。伊利石、高岭石主要来自普里兹湾陆架,高岭石含量越高,表明当时的气候越温湿;而伊利石和蒙脱石则相反,它们的含量越高,说明当时的气候条件比较寒冷干燥。整体来看,伊利石和蒙脱石的含量占绝大部分,因此,整个岩心所形成环境比较寒冷干燥。
The climatic significance of clay mineral composition is discussed in this paper based on the14 C dating and clay mineralogical data of the Core ANT29-P4-03 taken from the northwest side of the Prydz Bay.The abundance of clay minerals are in an order of illite〉 smectite〉 kaolinite〉 chlorite.Smectite is mainly derived from igneous rocks and was higher during the periods of 26.0~26.5ka,25.3~25.6ka,25.0ka,and 16.5~17.0ka.It means that the content of smectite was high in glacial periods,but low in inter-glacial periods.Illite and kaolinite mainly came from the Prydz Bay shelf.The higher the content of Kaolinite,the more humid the climate would be.Illite,on the other hand,indicates a colder and drier climatic condition.In general,illite and montmorillonite dominated the core,therefore,the entire core was formed in a relatively cold and dry environment.
出处
《海洋地质前沿》
2016年第2期8-13,共6页
Marine Geology Frontiers
基金
南北极环境综合考察与评估专项(CHINARE2014-01-02)
