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ferromanganese
The REE signature distinctions of micronodules and macronodules can be attributed to variations of hydrogenic iron oxyhydroxides and diagenetic (hydrothermal) iron hydroxophosphates that are the major REE carriers in ferromanganese ore deposits.
      
We found and studied the phosphate and ferromanganese mineralization in the Holocene alluvium at upper reaches of the Severnaya Dvina River.
      
Geochemistry of Rare Earth Elements in Ferromanganese Micro- and Macronodules from the Pacific Nonproductive Zone
      
Ferromanganese micro- and macronodules in eupelagic clays at Site 35 of the South Basin were examined in order to check the REE distribution during the ferromanganese ore formation in nonproductive zones of the Pacific Ocean.
      
The study of buried ferromanganese micronodules revealed general regularities in the compositional evolution of oxyhydroxide matrices of ferromanganese micro- and macronodules.
      
Geochemistry of Rare Earth Elements and Thorium in Sediments and Ferromanganese Nodules of the Atlantic Ocean
      
Ferromanganese nodules of the hydrogenetic type with extremely high Ce (up to 1801 ppm) and Th (up to 138 ppm) contents occur in pelagic sediments.
      
Structure and Composition of Ferromanganese-Phosphate Nodules from the Black Sea
      
The oxidation of H2S-contaminated waters can result in the deposition of phosphate-siliceous and ferromanganese sediments.
      
Phosphorites from oceanic seamounts impregnated with ferromanganese oxyhydroxides contain 0.84-14.5 ppm of Mo and 0.1-17% of Mn.
      
Phosphate-bearing ferromanganese crusts overlying the seamount phosphorites contain 54-798 ppm of Mo and 10-20% of Mn; Mo/Mn ratio varies within 0.002-0.005.
      
The higher Mo content in phosphate-bearing ferromanganese crusts is a result of coprecipitation of Mo and Mn from seawater.
      
It is shown that ferromanganese oxyhydroxide deposits with different chemical compositions can be produced in sediments under similar sedimentation conditions.
      
Micronodules grow in sediments using hydrogenous ferromanganese oxyhydroxides.
      
Sources of the material of ferromanganese nodules are governed by their formation at the water bottom interface.
      
Differences of REE compositions in ferromanganese deposits are caused by the reduction of manganese during diagenesis and its separation from iron.
      
It is shown that the Kalamit ferromanganese nodule field, most probably, originated due to the delivery of manganese from the hydrosulfuric zone of the Black Sea.
      
It is demonstrated that the formation of ferromanganese nodules in the Black Sea represents an embryonic manganese ore process.
      
Nodules of various compositions, including ferromanganese nodules, have been found in bottom sediments of an artificial reservoir in the central Altai Territory.
      
The microelemental composition of nodules in the reservoir qualitatively fits the composition of ferromanganese nodules in seas and oceans.
      
 

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