Experimental study of mineral production in primodal solar nebula

原峰太阳星云矿物生产的实验研究

• 批准号: 07640642
• 负责人: IISHI Kazuake
• 金额: $ 1.22万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640642/
• 关键词: C chondrite; Olivine; Plane defect; Aqueous alteration; Enstatite whisker; Interplanetary dust; Condasation experiment; ウイスカー状エンスタタイト; 惑星問塵; かんらん石; 面状析出物; 原始星雲; 輝石ウイスカー

1. Reproduction experiments of (100) plane defects in olivineSingle crystals of Fa_<100>, Fa_<90>, Fa_<80>, Fa_<70>, and Fa_<60> in Fayalit-Forsterite solid solition were grown by TSFZ method. Thin sections (010) of about 15 mum thickness were hydrothermally altered at condition of 300ﾟC,0.1Kbar and HM buffer using HCl 1N or NaOH 1N solution. Planar precipitates were produced along (001) or (100) of olivine in acidic condition or alkaline condition, respectively. Oriented precipitates complexes were composed of hematite and amorphous silica in acidic condition and hematite and laihunite in alkaline condition. I explaned these results by cation leaching mechanism during olivine is altered in aqueous oxidizing environment. This result means that C chondrite was altered in alkaline oxidizing condition. I gave oral presentaiton on these results at Annual Meeting of Mineralogical Society of Japan and published them in the International Journal of Physics and Chemistry of Minerals.2. Reprodu … More ction experiments of enstatite whiskers which are elongated in a-axisEnstatitet whiskers which are elongated in the crystallogaraphic a-axis were produced only a few, but surely, at 25mmHg, at condensation temperature of 1150 ﾟC-1100 ﾟC and in the duration time of 10 minutes. None was condensated at the temperature higher than 1150 ﾟC,and enstatite whiskers elongated in c-axis was condensated alone at lower temperature than 1100ﾟC.Enstatite whiskers elongated in a-axis can grow in some probability at high supersaturation (high temperature) because crystal can growth at any direction in these conditions. However, enstatite whiskers elongated only in c-axis grow at low supersaturation (low temperature), because only these whiskers which is the highest crystal growth rate at low temperature can grow. On the other hand, inverted twins were found in the enstatite whiskers elongated in a-axis produced in this experiment. Threfore, these enstatite whiskers might be grown in the protoenstatite stable region, while enstatite whiskers found in interplanetary dust are clinoenstatite without inverted twins, which must be grown metastably at low temperature. Less

1.橄榄石中（100）面缺陷的再现实验用TSFZ法生长了Fa_2<100>、Fa_3、<90>Fa_4、<80><70>Fa_5、Fa_6、Fa_7、Fa_8、Fa_9、Fa_9、Fa_9、Fa_9、<60>F在300 ℃、0.1Kbar和HM缓冲液条件下，使用1 N HCl或1 N NaOH溶液对约15 μ m厚的薄切片（010）进行水热改变。在酸性和碱性条件下，分别沿橄榄石的（001）和（100）面沿着面析出相。在酸性条件下，赤铁矿与无定形二氧化硅形成定向沉淀复合体;在碱性条件下，赤铁矿与莱夫石形成定向沉淀复合体。用氧化环境中橄榄石的阳离子浸出机理解释了这一结果。这一结果说明C球粒陨石是在碱性氧化条件下发生蚀变的。在日本矿物学会年会上作了口头报告，并在《国际矿物物理与化学杂志》上发表。雷普罗杜 ...更多信息 在25 mmHg、冷凝温度1150 ℃ ~ 1100 ℃、冷凝时间10分钟的条件下，只产生了少量的、但肯定是在结晶学a轴方向上伸长的顽火辉石晶须。在高于1150 ℃的温度下，没有冷凝，并且在c轴上伸长的顽火辉石晶须在低于1100 ℃的温度下单独冷凝。在a轴上伸长的顽火辉石晶须在高过饱和度（高温）下可能生长，因为晶体在这些条件下可以在任何方向上生长。然而，顽火辉石晶须仅在c轴方向上伸长，在低过饱和度（低温）下生长，因为只有在低温下晶体生长速率最高的这些晶须才能生长。另一方面，在本实验中产生的顽火辉石晶须中发现了沿a轴伸长的反向孪晶。因此，这些顽火辉石晶须可能生长在原顽火辉石稳定区，而在行星际尘埃中发现的顽火辉石晶须是没有反向孪晶的斜顽火辉石，必须在低温下亚稳态生长。少

项目成果

Kazuake Iishi: "Planar defects in iron-rich olivines produced experimentally in aqueous oxidizing environment" Physics and Chemistry of Minerals. (印刷中). (1997)

Kazuake Iishi：“在水氧化环境中实验产生的富铁橄榄石的平面缺陷”《矿物物理与化学》（出版中）。

K.Iishi: "Oriented precipitate complexes iniron-rich olivines produced experimentally in aqueous oxidizing environment" Physics and Chemistry of Minerals. (in print). (1997)

K.Iishi：“在水氧化环境中实验产生的富铁橄榄石中的定向沉淀复合物”《矿物物理与化学》。