摘要
本文对DY85 1航次采自东太平洋海盆“CC”区不同地貌区、不同类型的大洋多金属结核进行了O、C、H、Si等同位素综合研究。结果表明 ,O同位素变化能反映结核的生成环境、生长速率、物质来源及成矿机理 ;Si同位素组成特征能帮助推测结核核心物质的来源 ;C同位素的研究表明 ,多金属结核成矿作用是在古海洋水变冷的总趋势下进行的 ;δ1 3C、δ1 8O和δD的规律变化 ,反映了海洋水变冷的周期性和渐变性。
Oxygen,carbon,hydrogen and silicon isotopic integrated studies were performed for different types of oceanic polymentallic nodules collected from different morphologic areas in area “cc” of east Pacific basin during No.Dy85 1 navigation.According to the result of the studies,oxygen isotope change can reveal the formation environment,growth rate,material source and oreforming mechanism of nodules,silicon isotope composition helps to infer the sources of core materials of nodules,carbon isotope characteristics indicate that the ore_forming process took place under the general tendency that paleooceanic water became increasingly cooler,and regular variation of δ 13 C、δ 18 O and δD values reflect the periodicity and the gradual change nature of the the cooling process of oceanic water.
基金
国家重点科技项目!(编号为DY85 - 0 2 )
