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Mineralogical Studies of Mica Clay Minerals Associated With Roseki Deposits.

与 Roseki 矿床伴生的云母粘土矿物的矿物学研究。

基本信息

批准号：
60470055
负责人：
HIGASHI Shoji
金额：
$ 1.15万
依托单位：
Kochi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60470055/
关键词：
Roseki deposit Sericite minerals Hydrothermal alteration Ammonium mica Polytype DTA Thermal behavior 加熱特性

项目摘要

Mineralogical properties of the so-called sericite minerals associated with some Roseki deposits in the Chugoku provinces have been investigated by X-ray diffraction, chemical and thermal analytical methods.The sericite minerals constituting a typical Roseki deposit of the Yagi mine in the Mitsuishi district, Okayama Prefecture, yield noticeable substitution of ammonium for interlayer potassium and variable interstratification with montmorillonite showing a remarkable tendency to increase from silicified zone to intensely sericitized (Roseki) zone through spotted "Toseki" zone. On the contrary, the minerals occurring in a "high-temperature" type Roseki deposit of the Uku mine, Yamaguchi Prefecture, are well-crystallized <2M_1> sericite having neither interlayer substitution nor mixedlayering with montmorillonite. The specimens from a "telescope" type Roseki deposit of the Horo mine, Hiroshima Prefecture, are of intermediate nature between the typical and "high-temperature " type deposits.Additionally thermal properties of these seicite minerals are to be noticed in relation to interlayer substitution of ammonium for potassium. Usual potassium mica yield simple dehydroxylation around 500-600゜C. Ammonium-bearing mica, however, forms H-mica structure at once by detachment of ammonia from the interlayer ammonium at 400-500゜C and then slow dehydroxylation takes place at relatively high temperature range of 700-800゜C followed by subsequent transformation to mullite and silica mineral at about 1000゜C. This thermal behavior is accompanied with distinctive volume constraction, which is considered to be an important character in utilizing as ceramic materials.

本文用X射线衍射、化学分析和热分析等方法研究了日本国内几个Roseki矿床中的绢云母矿物的矿物学性质，并对构成冈山三石地区八木矿Roseki存款的绢云母矿物进行了研究。铵对层间钾有明显的替代作用，蒙脱石层间变化趋势明显从硅化带到强绢云母化（Roseki）带，再到斑点状的“Toseki”带。而山口县宇久矿的“高温”型Roseki存款中的矿物是结晶良好的<2M_1>绢云母，既没有层间置换，也没有与蒙脱石混层。广岛县幌罗矿“望远镜”型Roseki存款的样品，是典型和“高温“型矿床之间的中间性质。此外，还应注意这些绢云母矿物的热性质与层间铵取代钾的关系。钾云母在500-600 ℃左右发生简单的脱羟基反应。然而，含铵云母通过在400-500 ℃下从层间铵中分离氨而立即形成H-云母结构，然后在700-800 ℃的相对高温范围内发生缓慢的脱羟基作用，随后在约1000 ℃下转化为莫来石和二氧化硅矿物。这种热行为伴随着独特的体积膨胀作用，这被认为是用作陶瓷材料的重要特征。