摘要:
基于普里兹湾西北侧海域ANT29-P4-03沉积岩心14C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、16.5~17.0 ka 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。
Abstract:
The climatic significance of clay mineral composition is discussed in this paper based on the 14C 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,25.3~25.6 ka,25.0 ka,and 16.5~17.0 ka. 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.
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