Numerical and Experimental Simulation of Reaction-Diffusion Processes in Metamorphic Rocks

变质岩反应扩散过程的数值和实验模拟

• 批准号: 02640634
• 负责人: NISHIYAMA Tadao
• 金额: $ 1.34万
• 依托单位: Kyushu 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: 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-02640634/
• 关键词: Mineral Solubility; Reaction-Diffusion Equation; Serpentine Melange; Mass Transfer; Albitite; Metamorphic Layering; Uphill Diffusion; 交代作用; 反応帯; 脱水反応; 拡散; カイネティクス; 複合脈; 溶解度; 熱水合成

Several kinds of composite veins in serpentinite from the Nagasaki metamorphic rocks are investigated in terms of petrography and petrogenesis. Numerical simulation of reaction-diffusion equations together with mineral solubility data gives estimation of compositions of the fluid responsible for the formation of the composite veins.Mass transfer within serpentinite melange developing between serpentinite and pelitic schists and the resultant formation of albitite are examined. Comparison of bulk composifin of albitite and that of pelitic schists together with density data enables us to estimate the amounts of addition and subtraction in chemical components during the formation of albitite from pelitic schists. Major change in compositions is subtraction of SiO_2, MgO, CaO and FeO due to dissolution of quartz and actinolite in pelitic schists. Other components are immobile.The process of development of metamorphic layering based on uphill diffusion model is Simulated by Cell Dynamical Method. Local equilibrium between minerals and the intergranular fluid can enhance diffusion - coupling and cause uphill diffusion. Most metamorphic layering can be well explained by this model.Solubility of albite under hydrothermal conditions were experimentally investigated.

本文对产于长崎变质岩中的几种蛇纹岩复合脉进行了岩相学和岩石成因研究。反应-扩散方程的数值模拟结合矿物溶解度数据估算了复合脉形成的流体成分，研究了蛇纹岩和泥质片岩之间的蛇纹岩混杂岩中的质量传递以及由此形成的钠长石岩。通过比较钠长石岩和泥质片岩的体相组成，并结合密度数据，可以估算泥质片岩形成钠长石岩过程中化学成分的增减量。泥质片岩中石英和阳起石的溶解导致SiO_2、MgO、CaO和FeO的减少是主要的成分变化。采用细胞动力学方法模拟了基于上坡扩散模型的变质分层发展过程。矿物与粒间流体的局部平衡可以增强扩散耦合，导致向上扩散.实验研究了钠长石在热液条件下的溶解度。

项目成果

Marumo F(ed.),J.T.Iiyam: "Material transter duriy metamorphic proceses:expernental appuaches" Dynamic Processes of Mateial Transport and Troma Tamation in the Earthis Interior,TERRAPUB. 119-137 (1990)

Marumo F（编辑），J.T.Iiyam：“物质传输持续变质过程：实验应用”地球内部物质传输和 Troma Tamation 的动态过程，TERRAPUB。

西山 忠男: "沈み込み帯における反応と変化のカイネティクス" 地球. 12. 601-605 (1990)

西山忠雄：“俯冲带反应和变化的动力学”地球。12. 601-605 (1990)

T Nishiyama: "CO_2-metasomatism of a netabasite lloih in a serpentine melarge from the Nishisonogi netamorpbic rochs,southwest Japan." Contrib Mineral Petrol. 104. 35-46 (1990)

T Nishiyama：“来自日本西南部 Nishisonogi netamorpbic rochs 的蛇纹石中的 netabasite lloih 的 CO_2-交代作用。”

T.Nishiyama: "Uphill duffusion and chemical layering in a mineralーfluid system." Springer Proceedings in Physics,vol 52 “Dynamics and Patterns in Complex Fluids". 52. 219-220 (1990)

T. Nishiyama：“矿物流体系统中的上坡扩散和化学分层”，《施普林格物理学报》，第 52 卷“复杂流体的动力学和模式”，52. 219-220 (1990)。

T. Nishiyama: "Pattern formation due to uphill diffusion." Monthly Chikyu. 5. 311-319 (1990)

T. Nishiyama：“由于上坡扩散而形成图案。”