DIRECT OBSERVATION OF HYDROUS SILICATE MELTS IN HIGH TEMPERATURE AND PRESSURE CONSITIONS : UNDERSTANDING THE ROLE OF H2O IN MELTING OF THE EARTH'S MANTLE.

高温高压条件下水合硅酸盐熔化的直接观察：了解水在地幔熔化中的作用。

• 批准号: 10554024
• 负责人: TATSUMI Yoshiyuki
• 金额: $ 7.04万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10554024/
• 关键词: Diamond anvils; magma; high temperature; H2O; Infrared; high pressure; ダイアモンドアンピル; エンスタタイト

Knowledge of structures of magmas is important to model the evolution of the earth's interior. Much efforts had been made to understand structure of magmas by measuring properties of glasses quenched from high temperature and pressure conditions. Properties of silicates melts have been found to be different from those of quenched glasses. Therefore, the direct measurement of melts at high temperature and pressure conditions is desirable. Based on chemistry of partial melts of H2O-saturated mantle peridotite, we have suggested structures of hydrous melts should change drastically with an increasing pressure. For direct observations of magmas at high temperature and pressure conditions, Bassett's type externally heated DAC can be one of ideal tools because of its easy temperature control within a few degree C in a range to 1050 degree C.FTIR microscopy with this DAC is used to understand complete miscibility between H2O-rich melts and silicate-rich H2O fluids and also temperature depende … More nce of OH/H2O abundances in aluminosilicates and felsic magmas. A series of experiments of complete miscibility in H2O and an island arc andesite has been conducted in our laboratory. So, let's do this business with magmas relevant to mantle conditions. It is revealed that there is a difficulty to conduct experiments in mafic systems such as enstatite MgSiO3, diopside CaMgSi2O6, wollastonite CaSiO3, natural basalt, and high Mg andesites. When the glasses of those mafic compositions are heated with water in DAC, crystallization of pyroxene or amphibole takes place quickly at around 500 degree C.The crystals do not remelt and no melt of the system itself can be obtained in a temperature range to 1050 degree C.In order to obtain melts of these chemical compositions, higher temperature DAC should be used. Above 1050 degree C, diamond surfaces quickly transform to graphite. Internal heating method , which is able to heat samples uniformly and leave diamonds less hot, can be a better tool to investigate the mafic melts. Less

对岩浆结构的了解对于建模地球内部的演变很重要。通过测量从高温和压力条件下淬灭的玻璃的性能来理解岩浆的结构。发现有机硅熔体的性能与淬火玻璃的性质不同。因此，希望在高温和压力条件下直接测量熔体。基于H2O饱和地幔橄榄岩的部分熔体的化学性质，我们建议含水熔体的结构应随着压力增加而发生巨大变化。对于在高温和压力条件下直接观察岩浆，Bassett的外部加热DAC的类型可以是理想的工具之一，因为它在几个度至1050度范围内的数度C内易于控制。C.FTIR显微镜使用此DAC来理解H2O-RICH-RICH-RICH-RICH MELT和硅胶含量的完全失误，并且在Alum flues和semins flue and nce ince ince上也有更多的nce oh oh oh oh oh oh oh oh 2和长信岩浆。在我们的实验室中，已经进行了一系列在H2O和Island Arc和Loce的实验。因此，让我们以与地幔条件相关的岩浆进行这项业务。据揭示，在诸如Enstatite MGSIO3，Diopside CAMGSI2O6，Wollastonite Casio3，Natural Basalt和高MG和SSITE等镁铁矿系统中很难进行实验。当这些健康成分的玻璃在DAC中用水加热时，辉石或闪石的结晶迅速发生在500摄氏度左右。Crystals不会渗透，并且无法在温度范围内获得该系统本身的熔体。可以在1050摄氏度至1050度中获得C.IN的顺序，以获得这些化学成分的较高温度DAC，并使用了较高的温度DAC。钻石表面在1050摄氏度以上，迅速转化为石墨。内部加热方法能够统一加热样品并减少钻石，这可能是研究镁铁质熔体的更好工具。较少的

项目成果

Tatsumi, Y.: "Activation o Pacific mantle plumes during the Carboniferous : evidence from accretionary complexes in southwest Japan."Geology. 28. 580-582 (2000)

Tatsumi, Y.：“石炭纪期间太平洋地幔柱的活化：来自日本西南部增生复合体的证据。”地质学。

Tatsumi,Y.: "Contrasting behavior of noble-metal elements during magmatic differentiation in basalts from the Cook Islands, Polynesia."Geology. 28. 131-134 (2000)

Tatsumi,Y.：“波利尼西亚库克群岛玄武岩岩浆分异过程中贵金属元素的对比行为。”地质学。

Tatsumi,Y.: "Activation of Pacific mantle plumes during the Carboniferous : evidence from accretionary complexes in southwest Japan."Geology. 28. 580-582 (2000)

Tatsumi,Y.：“石炭纪期间太平洋地幔柱的活化：来自日本西南部增生杂岩的证据。”地质学。

Tatsumi,Y.: "The petrology of a melilite-olivine nephelinite from Hamada, SW Japan."J.Petrology. 40. 497-509 (1999)

Tatsumi,Y.：“来自日本西南部滨田的黄长石-橄榄石霞石岩的岩石学。”J.Petrology。

Tatsumi,Y.: "Transition from arc to intraplate magmatism associated with backarc rifting : evolution of the Sikhote Alin volcanism."Geophysical Research Letters. 27. 1587-1590 (2000)

Tatsumi,Y.：“与弧后裂谷相关的从弧到板内岩浆作用的转变：Sikhote Alin 火山活动的演化。”地球物理研究快报。