群馬県戸倉産の38A混合層粘土鉱物

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概要

• 論文の詳細を見る

• The Urushizawa Tuffs, which are pale greenish white ones of Neogene Epoch, developed around the upper reaches area of the Katashina River. Mica clay, chlorite and other minerals occur in these tuffs as alteration products. 38Å interstratified clay mineral occurs in a part of these altered tuffs. Prefered orientation X-ray patterns of the fine fraction of the specimen, containing 38Å clay mineral, show the irrational series of basal reflections, such as 38.4Å, 18.3Å, 11.6Å, 9.0Å, 4. 91Å, 3.20Å, and 1.94Å. The refrection peaks of mica clay and chlorite .can be seen in the same pattern. These reflection peaks of 38Å clay shift to 40.2Å, 19.1Å, 12.2Å, 9.32Å, 5.22Å, 3.31Å and 1.92Å by treatment with ethylene glycol. 38.4Å, 18.3Å, and 9.0Å reflection peaks disappear by heat treatment at temperature below 300℃. The other peaks remain, and shift to 9.9Å, 4.93Å, 3.26Å and 1.95Å by treatment at 400℃. Then, these reflection peaks slightly shift to low angle side as treatment temperature incleases, and coincide with the reflection peaks of mica clay by treatment at 800℃. The differential thermal analysis 'curve shows three endothermic peaks at 150°, 200° and 580℃, and a very weak exothermic peak at 950℃. 3% weight loss occurs by dehydration of interlayer water, and 4.3% weight loss ,occurs by dehydroxylation. These data, above mentioned, suggest the presence of montmollironite and mica clay as constituent unit layers of 38Å interstratified clay mineral.

• 日本粘土学会の論文
• 1970-09-15

著者

• 木崎 喜雄

  群馬大学教育学部地学教室

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