UNUSUAL ACCUMULATION OF GIBBSITE AND HALLOYSITE IN THE KITAKAMI PUMICE BED, WITH A NOTE ON THEIR GENESIS

スポンサーリンク

概要

• 論文の詳細を見る

• Unusual accumulation of yellowish gray clay materials has been noticed at places in the lower part of the Kitakami pumice bed. Field survey and laboratory examinations have revealed that this accumulation is mainly a secondary deposition of the clays carried down by percolating water. The deposition was apparently accelerated by water stagnation caused by an underlying Pleistocene clay bed as a slowly permeable layer. Gibbsite, halloysite, and allophane were the dominant clay minerals in the accumulated material with some imogolite and free sesquioxides as accessory constituents. The sum of the content of the former two minerals amounted to 35 to 40 per cent, and was higher than that in the clay fraction of the upper part of the pumice layer where no accumulation occurred. The relative concentration of gibbsite and halloysite was accounted for by their high dispersibility relative to allophane in the percolating water. Chemical analyses have shown that a considerable amount of Al together with Si is liberated rather continually from the upper pumice bed. The concentration of Al in water extracts of a moist sample taken from the field was evidently higher than that expected from its solubility in the same pH range probably owing to the presence of organic matter, but decreased to a few-hundredths upon mild air-drying of the sample. These results suggested strongly that aluminum hydroxides and silica-alumina coprecipitates form rather readily, and evolve to gibbsite, halloysite, imogolite, or possibly allophane in the pumice bed.

著者

• NAKAI Makoto

  Faculty of Agriculture

• Yoshinaga Naganori

  Faculty Of Agriculture

• YAMAGUCHI MIKICHIKA

  Faculty of Agriculture, Ehime University

• Yamaguchi Mikichika

  Faculty Of Agriculture Ehime University

関連論文

• MINERALOGY OF RED- AND YELLOW-COLORED SOILS FROM THAILAND
• CLAY MINERALOGY OF RED- _AND YELLOW-COLORED SOILS FROM KOREA
• FORMATION OF IMOGOLITE AND ALLOPHANE IN SHATTERED SANDSTONE UNDERLYING BROWN FOREST SOIL
• A DEVICE IN THE DETERMINATION OF Si IN DITHIONITE-CITRATE-BICARBONATE EXTRACT
• UNUSUAL ACCUMULATION OF GIBBSITE AND HALLOYSITE IN THE KITAKAMI PUMICE BED, WITH A NOTE ON THEIR GENESIS
• Chemistry and Mineralogy of Some Soils from Indonesia
• BONDING STATE OF SILICON IN NATURAL FERRIHYDRITES BY X-RAY PHOTOELECTRON SPECTROSCOPY
• Imogolite and Allophane in Shattered Sandstone Underlying a Brown Forest Soil
• ALLOPHANE IN SOME ANDO SOILS
• IMOGOLITE IN SOME ANDO SOILS
• Clay Mineralogy of Soils from Upper North Thailand
• Clay Mineralogy of a Reddish Brown Lateritic Soil from Thailand
• Synthesis of ferrihydrite and feroxyhyte
• CHEMICAL COMPOSITION AND SOME THERMAL DATA OF EIGHTEEN ALLOPHANES FROM ANDO SOILS AND WEATHERED PUMICES
• ADSORPTION OF POLYPHOSPHATES BY ALLOPHANE
• IDENTIFICATION OF IMOGOLITE IN THE FILMY GEL MATERIALS IN THE IMAICHI AND SHICHIHONZAKURA PUMICE BEDS
• OCCURRENCE OF IMOGOLITE AS GEL FILM IN THE PUMICE AND SCORIA BEDS OF WESTERN AND CENTRAL HONSHU AND HOKKAIDO
• THE BEHAVIOR OF ADSORBED WATER IN CLAYS ON ADDITION OF INORGANIC ELECTROLYTES AS AQUEOUS SOLUTION

もっと見る 閉じる

スポンサーリンク