福島県天栄山付近の安山岩中の雲母/スメクタイト混合層鉱物

概要

論文の詳細を見る
A non-regularly interstratified mica/smectite was found in an argillized vein of the hydrothermally altered andesite at Tenei district, Fukushima Prefecture. The mineral has a 23.9A reflection and the proportions of mica and smectite layers are 83% and 17%, respectively. Chemical analysis of the mineral shows the structural formula of (Na_<0.21> K_<0.77> Ca_<0.28> Mg_<0.02>) (Al_<3.69> Fe_<0.22> Mg_<0.19> Ti_<0.01>)(Si_<6.24> Al_<1.76>) O_<20>(OH)_4,and it seems to consist of muscovite-like and montmorillonite-beidellite-like layers. Chemical analysis of the bulk samples from the argillized vein and the accompanying less well-argillized and non-argillized parts showed that the argillized vein contained K_2O and H_2O in high amounts relative to the non-argillized part. The high content of the two elements in the argillized vein was considered to be attributed to the presence of interstratified mica/smectite mineral, and that they were supplied possibly from hydrothermal solutions.
日本粘土学会の論文
1988-09-01