EXPERIMENTAL STUDY ON THE METAMORPHIC CONDITIONS OF METAMORPHOSED MANGANIFEROUS IRON ORE DEPOSIT

变质锰铁矿床变质条件实验研究

• 批准号: 03640675
• 负责人: AKASAKA Masahide
• 金额: $ 1.28万
• 依托单位: SHIMANE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640675/
• 关键词: HYDROTHERMAL EXPERIMENT; Mn-Fe-ORE DEPOSIT; PIEMONTITE; OKHOTSKITE; PUMPELLYITE; 鉄マンガン鉱床; 変成鉱床; マンガン鉱床; 変成鉱物

This project was planned to investigate (1) the stability relations between piemontite, pumpellyite-(Mn^<2+>) and okhotskite in the experimental system and natural system, and (2) crystal chemistry on the piemontite, pumpellyite-(Mn^<2+>) and okhotskite. At first, as a check as to whether equilibrium fO_2 condition were attained, a series of runs was made in which various transition metals or their oxides (e.g., Cu, Cu_2O, CuO, Fe_2O_3) were sealed with H_2O in an Ag_<90>Pd_<10> capsule, then enclosed within Ag cupsules with the various buffer mixtures and water and held at 450ﾟC and 2-4 kbar for 3 weeks. Based on these experiments, it was concluded that the runs above 450ﾟC need 3-4 weeks and those below 450ﾟC need 6-10 weeks to attain equilibrium. Three kinds of oxide mixtures were used as starting materials, which correspond to the compositions of following piemontites ; Ca_2Al_2MnSi_3O_<12>(OH), (Ca_<0.8>Sr_<0.2>)_2Al_2MnSi_3O_<12>(OH) and (Ca_<0.6>Sr_<0.4>)_2Al_2MnSi_3O_<12>(OH). Runs at 2 kbar and 500, 550 and 600ﾟC, with Cu_2O-CuO buffer, revealed that piemontite is stable. At 4 kbar and same temperatures as above, piemontite also stable with the Cu_2O-CuO buffer. Runs products at the same pressures and temperatures with the hematite-magnetite buffer are garnets. At 4 kb and 250ﾟC with hematite-magnetite buffer, X-ray powder diffraction peaks of pumpellyite and chlorite were observed. These results suggest that the stability fields of pumpellyite, piemontite and garnet range in this order from lower temperature to high temperature.

本项目计划研究(1)在实验体系和自然体系中沸石、纤锌矿-(Mn^&lt；2+&gt；)和绿柱石之间的稳定性关系；(2)沸石、纤锌矿-(Mn^&lt；2+&gt；)和蛇绿石的晶体化学。首先，为了检查是否达到平衡fO_2条件，进行了一系列的运行，将各种过渡金属或它们的氧化物(如铜、铜、氧化铜、三氧化二铁)用水密封在一个银胶囊中，然后用不同的缓冲液和水封闭在银杯中，在450Kbar℃和2-4kbar的条件下保持3周。根据这些实验，得出的结论是，高于450ﾟC的运行需要3-4周，低于450ﾟC的运行需要6-10周才能达到平衡。以Ca2Al2MnSi3O&lt；12-gt；(OH)，(Ca_&lt；0.8&gt；Sr_&lt；0.2&gt；)_2Al_2MnSi_3O_&lt；12&gt；(OH)和(Ca_&lt；0.6&gt；Sr_&lt；0.4&gt；)_2Al_2MnSi_3O_&lt；12&gt；(OH).三种氧化物混合物为起始原料，其组成分别为：Ca2Al2MnSi3O&lt；12&gt；(OH)；在Cu2O-CuO缓冲溶液中，在500、550和600ﾟC下，在2kbar的温度下运行，表明沸石是稳定的。在4kbar和相同的温度下，蒙脱石在Cu2O-CuO缓冲液中也很稳定。与赤铁矿-磁铁矿缓冲液在相同压力和温度下运行的产物为石榴石。在4kb和2 5 0ﾟC的赤铁矿-磁铁矿缓冲溶液中，观察到了纤锌矿和绿泥石的X射线粉末衍射峰。这些结果表明，镁铝榴石、镁铝榴石和石榴石的稳定场由低到高依次为：低温-高温。

项目成果

鈴木 徳行: "隠岐島後中新世郡累層に見いだされた泥質岩中の方沸石コンクリーション" 島根大学地質学研究報告. 10. 89-95 (1991)

Noriyuki Suzuki：“隐岐岛后中新世枪地层中发现的泥质岩中的方沸石结核”岛根大学地质研究报告。10. 89-95 (1991)。

Ko Ikeda: "Crystalーfield spectroscopic study of Crーdoped mullite" American Mineralogist. 77. (1992)

Ko Ikeda：“Cr 掺杂莫来石的晶体场光谱研究”美国矿物学家 77。（1992 年）

赤坂 正秀: "メスバウアー分光学の鉱物学への最近の応用状況-とくにケイ酸塩鉱物を例にして-" 鉱物学雑誌. 21. 3-20 (1992)

Masahide Akasaka：“穆斯堡尔光谱学在矿物学中的最新应用 - 特别是硅酸盐矿物 -”《矿物学杂志》21. 3-20 (1992)。

Masahide Akasaka: "Mineralogy of piemontiteーbearing schist in the Yamagami metamorphic rocks of northeastern Abukuma platean" 岩鉱.

Masahide Akasaka：“阿武隈高原东北部山上变质岩中含皮蒙特岩片岩的矿物学”。

Masahide AKASAKA: "Mineralogy of piemontite-beaning schist in the Yamagami metamorphic rocks of northeas tern Abukuma Plateau" 岩鉱. 88. (1993)

Masahide AKASAKA：“阿武隈高原东北部山上变质岩中的皮蒙特岩豆片岩的矿物学”，《岩石矿山》88。（1993）