The compositional ranges of Mn-pyroxenoids

锰辉石类化合物的组成范围

• 批准号: 02640645
• 负责人: MATSUBARA Satoshi
• 金额: $ 0.26万
• 依托单位: National Science Museum
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640645/
• 关键词: Pyroxmangite; Rhodonite; Bustamite; Johannsenite; マ-スタ-石; 南部石; マンガン準輝石

Mn-pyroxenoids and clinopyroxenes from Japan were analysed using EDS. Pyroxmangite is extant under 10 % of CaSiO_3 mole, and only Ca-poor one is stable at higher temperatures. The compositional range of FeSiO_3 mole varies widely and reaches 32 mole % among studied pyroxmangites. Rhodonite may be stable under the wide temperature range, and its compositional range exsists between 10 % and 20 % of CaSiO_3 sole and under 30 % of (Fe. Mg)SiO_3 mole. Rhodonite accompanying johannsenite formed under low temperature is high-calcian, and its CaSiO_3 mole reaches about 35 %. Bustamite has wide compositional range located within the area between 30 % and 55 % of CaSiO_3 mole and under 20 % of (Fe. Mg)SiO_3 mole. In case of high temperature, bustamite is stable in the compositional area of clinopyroxene under 20 % of (Fe. Mg)SiO_3 mole. The decreasing temperature invites the appearance of johannsenite near CaMnSi_2O_6, and the distribution of clinopyroxenes on Ca(Fe, Mg)Si_2O_6- CaMnSi_2O_6 join becomes consecutive. That is, the stability field of bustamite is limited at lower temperatures. but it is able to exist outside of clinopyroxene area.

用能谱分析了日本产锰辉石和斜辉石。在10% CaSiO_3摩尔下存在辉锰矿，只有贫钙辉锰矿在较高温度下稳定存在。FeSiO_3的摩尔组成范围变化很大，在所研究的辉锰矿中可达32摩尔%。Rhodonite在较宽的温度范围内是稳定的，其组成范围在CaSiO_3 sole的10% ~ 20%和（Fe）的30%以下。毫克)SiO_3摩尔。低温下形成的菱铁矿伴生磷灰石是高钙矿，其CaSiO_3摩尔达35%左右。Bustamite的组成范围较广，CaSiO_3摩尔数在30% ~ 55%之间，Fe摩尔数在20%以下。毫克)SiO_3摩尔。在高温条件下，在铁含量低于20%的斜辉石组成区域内，bustamite是稳定的。毫克)SiO_3摩尔。随着温度的降低，CaMnSi_2O_6附近出现了约翰长石，Ca(Fe, Mg)Si_2O_6- CaMnSi_2O_6连接点上斜辉石的分布趋于连续。也就是说，在较低温度下，布氏体的稳定场受到限制。但它可以存在于斜辉石区之外。

项目成果

Kato, A. & S. Matsubara: "Bustamite and the associated manganese silicates from the Higashi Kaso mine, Wadanai, Kanuma City, Tochigi Prefecture, Japan." Bull. Tochigi Prefectural Mus.No. 8. (1992)

加藤，A.

松原 聰,加藤 昭: "Chemical compositions of rhodonite,bustamite and Mnーbearing clinopyroxene from skarns in Japan" 国立科学博物館研究報告. 18. (1992)

Satoshi Matsubara、Akira Kato：“日本夕卡岩中的蔷薇辉石、铜锰矿和含锰单斜辉石的化学成分”，国立自然科学博物馆研究报告 18。（1992 年）。

加藤 昭,松原 聰: "Bustamite and the associated manganese silicates from the Higashi Kaso mine,Wadanai,Kanuma City,Tochigi Prefecture,Japan" 栃木県立博物館研究紀要. 8. (1992)

Akira Kato、Satoshi Matsubara：“来自日本栃木县鹿沼市和田内东加苏矿的 Bustamite 和相关硅酸锰”栃木县博物馆研究公报 8。（1992 年）。

Matsubara, S. & A. Kato: "Chemical compositions of rhodonite, bustamite and Mn-bearing clinopyroxene from skarns in Japan" Bull. Natn. Sci. Mus. 18. (1992)

松原，S.