中太平洋深海沉积物中元素组合特征及地质意义  

THE ELEMENT ASSOCIATION CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF DEEP-SEA SEDIMENTS IN THE CENTRAL PACIFIC OCEAN

作　　者：王汾连[1,2] 何高文[1] 王海峰[1] 任江波[1] 

机构地区：[1]国土资源部海底矿产资源重点实验室,广州海洋地质调查局,广州510075 [2]中山大学海洋科学学院,广州510006

出　　处：《海洋地质前沿》2016年第7期11-18,共8页Marine Geology Frontiers

基　　金：国土资源部海底矿产资源重点实验室开放基金(KLMMR-2015-A-06);国土资源部公益性行业科研专项(201511036);中国地质调查局专项(DD20160214)

摘　　要：深海沉积物中稀土（REY，包括Y）是继多金属结核、富钴结壳和热液硫化物之后又一有潜力的深海矿产资源。对中太平洋46个富稀土的沉积物样品（∑REY-（730～1596）×10^-6）和53个相对贫稀土的沉积物样品（∑REY-（324-487）×10^-6）进行主微量和稀土地球化学分析，利用聚类分析和因子分析法，对元素组合特征进行了分析，划分元素组合和4个主因子。综合特征表明，2类沉积物REY的富集均与磷酸盐有关，REY含量高低取决于磷酸盐含量，但沉积物的形成具有多源多期的特点，富REY沉积物中铝硅酸岩（黏土矿物和沸石）对沉积物中磷酸盐富集REY的过程具有重要的促进作用，而在贫REY沉积物中铝硅酸岩对REY的富集意义不明显。The deep sea sediments which are rich in rare earth elements and yttrium, （REY, including Y） may become a potential mineral resource in the Ocean in addition to polymetallic nodules, cobalt-rich crusts and hydrothermal sulfides. The major and trace elements for 46 samples of REY rich sediments （∑REY： （730-1 596）×10^-6 ） and 53 samples with relatively poor REY （∑REY-- （324 487）×10^-6 ） from the Central Pa- cific Ocean were analyzed. The groups of elemental associations and four main factors were defined respective- ly by using cluster analysis and factor analysis. The geochemical characters and elemental associations of these sediments suggest that the REY contents depend on the P contents for both the two types of sediments. However, the sediments came from different sources and deposited in different time. The aluminum silicate （clay minerals and zeolites） plays more important role for the concentration of REY in the REY-rich sediments but less significant role in the REY-poor sediments.

关 键 词：深海沉积物 稀土元素 元素组合 中太平洋 

分 类 号：P736.21[天文地球—海洋地质]