【摘要】 本文详细描述了取自太平洋西部7个岩心沉积物中Fe、Mn、Mg的分布、来源及地球化学特征。由于Fe、Mn、Mg的含量与火山碎屑矿物和沉积物类型有关,这对太平洋西部的沉积环境起着标志作用。更多还原

【Abstract】 The distribution,origin and geochemical characteristics of Fe,Mn and Mg in seven sediment cores from the west Pacific region (2-8 N,170-173 20 E) are discussed in the present paper.The results show that the contents of Fe,Mn and Mg in die sediments increase in the order of calcareous ooze→calcsiliceous ooze→brown clay→siliceous ooze Fe and Mn are derived mainly from pyroclastic minerals,and Mg from sea water,which is adsorbed on clay.Also these three elements are partly derived from biogenetic sediments since Fe and Mn are of similar origin,there is a positive correlation between them.As the contents of Fe,Mn and Mg are closely related to the types of pyroclastic minerals and sediments,they fall within two separate areas on CaCO3-SiO2 diagram.This is a typical mark for the sedimentary environment of the studied area.The close relationship between the Mn/Fe ratio in the sediments and their type indicates that the degree of concentraction of Mn relative to Fe increases progressively from calcareous ooze to calcsiliceous ooze and then decreases from calc-siliceous ooze to siliceous ooze.更多还原