Reaction process of metamorphic minerals.

在这个研究项目中，我们将讨论以下三项研究，其中包括超变形矿物的反应过程已经完成。（1）水热设备的建造：水热设备是专门设计和建造的，可进行高达900 ° C和1 KB的实验。（2）超临界水中二氧化硅扩散常数的决定：超临界水中反应动力学的最重要因素是超临界水中二氧化硅扩散常数的决定。在（1）中，使用水热设备构造进行了测量。该实验在系统上完成; SiO_2 - Mg（OH）_2、SiO_2 - MgO、SiO_2 - Ca（OH）_2、SiO_2 - CaO、SiO_2 - CaCO_3。反应产品的数量直线地增加了其持续时间的根。根据这种关系，扩散常数按以下计算; D = Do. exp（[-（E+PV^*）]/RT）， Do = 0.55（+0.57， -0.28）厘米^2/秒， E = 48（<加减>5）千焦/摩尔，V^*= 81<plus-minus>12） cm^3/mol。R和T在气体恒定、温度和温度的地方。（3）金属岩石中的高温度形态的出现：金属岩石是金属岩石的主要阶段，有两种聚合物，高温度和低温度形态。如果没有报告说，超变形岩石中的高温形式存在，从目前的研究中发现的高温形式中的裂缝的部门扭曲。Furthermore，基于该部门的爬行的出现，接触变形岩石可以被分类成两个带脐带的区域。高温表格的稳定性范围也被研究使用水热设备（1）。稳定的领域比那些被报告的更宽，即使在700 ° C时，高的形式也稳定。

In this research project, the following three studies concerning with reacation processes of metamorphic minerals were carried out.(1) Construction of hydrothermal equipment: A hydrothermal equipment was specia-ly designed and constracted to carry out experiments up to 900゜C and 1 kb.(2) Determination of diffusion constant of silica in supercritical water: The most important factor of reaction kinetics in metamorphism and metasomatism is a diffusion constant of silica in supercritcal water. The diffusion constants was measured using the hydrothermal equipment constructed in (1). The experiments were done on the system; SiO_2 - Mg(OH)_2, SiO_2 - MgO, SiO_2 - Ca(OH)_2, SiO_2 - CaO, SiO_2 - CaCO_3. The amounts of reaction products were incleased linearly with the root of duration time. Based on this relationship, the diffusion constant were calculated as follows; D = Do.exp([-(E+PV^*)]/RT), Do = 0.55(+0.57, -0.28) cm^2/sec, E = 48(<plus-minus>5) kj/mol., V^*= 81<plus-minus>12) cm^3/mol., where R and T are gas constant and temperature, respectively.(3) Appearence of high-temperature form of cordierite in metamorphic rock: Cordierite is major phase of metamorphic rocks and has two polymorphs, high- and low-temperature forms. While no reports were there on occurrence of the high-temperature forms in metamorphic rock, sector trilling of cordierite transformed from the high-temperature form was found in the present study. Furthermore, based on appearence of the sector trilling, the contact metamorphic rock can be classfied into two zones with cordierite. Stability field of the high-temperature form was also studied using the hydrothermal equipment of (1). The stability field is wider than those reviously reported and the high-form is stable even at 700゜C.