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《Marine Geology & Quaternary Geology》 2001-01
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COBALT-RICH FERROMANGANESE CRUSTS FROM THE MA,ME AND MF SEAMOUNTS OF THE MAGELLAN SEAMOUNTS

ZHU Ke chao 1,2 ,ZHAO Zu bin 2,LI Yang 2 ( 1Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China; 2Second Marine Geological Brigade,Guangzhou Geological Survey,Guangzhou 510760,China)  
The study of the cobalt rich ferromanganese crusts which have three layer structure from the MA,ME and MF seamounts of the Magellan Seamounts gives the following results:(1)the typical three layer structure crust can be divided into dense layer in the upper part,loose layer in the middle,and dense layer in the lower.The lower dense layer has a simple structure and few gangue minerals,the loose layer has a mixed structure and many gangue minerals,and the upper dense layer has an intermediate nature.The crust contains manganese minerals(mainly vernadite),ferro phase minerals and secondary minerals(clay mineral,phillipsite,quartz,calcite and fluorapatite).(2)There are clear geochemical differences among the three layers.It is indicated that the oxidation in the paleo oceanographical environment is decreased from lower to upper layer by Ce anomaly.(3)It is inferred that growth age of the oldest crust is late Miocene in this area, and there were weakest water dynamic condition and stronger oxidation before 4Ma,stronger water dynamic condition and weaker oxidation from 4Ma to 3.1Ma,and strong weak undulating water dynamic condition and weaker oxidation after 2.6Ma in this area.
【Fund】: 中国大洋协会 DY95 -9航次勘查资助项目
【CateGory Index】: P736.3
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