Diagenetic Nucleation, Ripening and Ostwald Stepping

成岩成核、成熟和奥斯特瓦尔德步进

• 批准号: 9903132
• 负责人: Peter Ortoleva
• 金额: $ 10.5万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903132&HistoricalAwards=false
• 关键词: Diagenetic; Nucleation; Ripening; Ostwald; Stepping

Ortoleva--9903132Models and numerical simulation tools to address nucleation, crystal growth and Ostwald stepping in diagenetic systems are developed and used to gain an understanding of their role in the evolution of the state of sediments during burial. Nucleation phenomena are modeled by simulating the coupled dynamics of the particle (crystallite) size distributions for the participating mineral chemistries and polymorphs. The size distribution of each phase is allowed to evolve with rates that account for particle size and shape through the dependence of the rate and equilibrium constants. A new numerical technique is introduced that allows for the simulation of particle growth from monomer and dimer tomacroparticles ( 10-23-mer). The algorithm is used to simulate the spatial variations of the particle size distributions across a layer of sediment. Application of the theory is made to systems with polymorphs of illite (platy or fibrous) or the many-polymorph system.[NOTE: in "10-23-mer" above, the -23 is an exponent

Ortoleva--9903132开发了解决成岩系统中的成核、晶体生长和奥斯特瓦尔德步进的模型和数值模拟工具，并用于了解它们在埋藏过程中沉积物状态演变中的作用。成核现象是通过模拟参与矿物化学和多晶型物的颗粒（微晶）尺寸分布的耦合动力学来模拟的。允许每个相的尺寸分布以通过速率和平衡常数的依赖性说明颗粒尺寸和形状的速率演变。介绍了一种新的数值技术，允许从单体和二聚体到大颗粒（10-23-mer）的颗粒生长的模拟。该算法被用来模拟的空间变化的粒径分布在一层沉积物。该理论的应用与伊利石（板状或纤维状）或多晶型系统的多晶型系统。[NOTE：在上面的“10-23-mer”中，-23是指数