Collaborative Research: Incorporating Temperature-dependent Physical Properties into Numerical Models of Magmatic and Related Hydrothermal Systems

合作研究：将温度相关的物理性质纳入岩浆及相关热液系统的数值模型中

• 批准号: 0911428
• 负责人: Anne Hofmeister
• 金额: $ 7.49万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0911428&HistoricalAwards=false
• 关键词: Collaborative; Research; Incorporating; Temperature; dependent

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Most geologic processes within the interior of the Earth are driven by heat transfer. These processes include magma generation, volcanism, geothermal systems, and generation of several types of ore deposits. Current mathematical and computer models used to study these processes generally assume fixed values for several fundamental properties of rocks such as heat capacity, that is the ability of rocks to hold heat, thermal diffusivity, that is the ability of rocks to transfer heat, and the amount of heat that is necessary to melt rocks. The values of these properties for many types of rocks, in particular how they vary with temperature, are still poorly known, and one aspect of the research focuses on experimental measurements in the laboratory. The new values will then be applied to modeling the growth of well-characterized magma bodies within the Earth's crust by continued or episodic magma injection, and how growth and crystallization of these plutons drives metamorphism of the surrounding rocks and geothermal systems. The project will provide an opportunity to train students and young scientists in research that will have laboratory, computational and field components. The ability to view complex natural processes from multiple perspectives is key to the training of successful geoscientists.The need for improved data on temperature-dependent properties of rocks that can be incorporated into integrated thermal models is motivated by recent advances in understanding of how granitic plutons are constructed, and because intrusion-induced metamorphic and geothermal systems generally have longer durations than simple conductive and convective thermal models typically predict. There has been a paradigm shift from viewing plutons as large volumes of magmas that are emplaced in a single pulse as diapirs to viewing plutons as bodies that grow over extended periods, from tens of thousands of years to millions of years. Prolonged injection of magma has consequences for crystallization histories of plutons and duration of metamorphic-geothermal systems, all of which are controlled by heat transfer. The aim of the project is to determine temperature-dependent properties of minerals and rocks and to develop integrated numerical models for magmatic-metamorphic-geothermal systems. The modeling will be field-tested by examination of the growth of the Harney Peak Granite pluton in the Black Hills and how its growth influenced its thermal aureole. The laboratory data will be useful to workers who study processes in many other geologic settings.

该奖项是根据2009年的《美国回收与再投资法》（公法111-5）资助的。地球内部最大的地质过程是由传热驱动的。这些过程包括岩浆产生，火山，地热系统以及几种类型的矿床。用于研究这些过程的当前数学和计算机模型通常假设岩石的几种基本特性（例如热容量），即岩石保持热量，热扩散率，即岩石传递热量的能力以及熔融岩石所需的热量的能力。这些特性对于许多类型的岩石的值，尤其是它们的温度变化，仍然鲜为人知，研究的一个方面集中于实验室的实验测量。然后，新值将应用于建模通过持续或情节岩浆注入或情节性岩浆注射在地壳中特征良好的岩浆体的生长，以及这些岩石的生长和结晶如何驱动周围岩石和地热系统的变质。该项目将提供一个机会，以培训将拥有实验室，计算和现场组件的研究学生和年轻科学家。从多个角度观察复杂的自然过程的能力是训练成功的地球科学家的关键。对岩石的温度相关性能的改进数据的需求是，可以将可以融入整合热模型的岩石的特性数据是由于最新的理解花岗岩成形子构建的进展而激发了对构建花岗岩的构建方式的进步，并且因为侵入诱导的变质和地球系统的效果比简单的持久性更长地构成了施用效率。从将柱子视为大量岩浆的范式转变，这些岩浆被单个脉搏扩展为湿透，转变为将岩石视为长期生长的物体，从数十千年到数百万年。长时间注射岩浆对岩体的结晶历史和变质地球层系统的持续时间有影响，所有这些系统均由热传递控制。该项目的目的是确定矿物和岩石的温度依赖性特性，并开发用于岩浆 - 超态地理系统的集成数值模型。该建模将通过检查黑山中Harney Peak Granite Pruton的生长以及其生长如何影响其热金黄色的生长进行现场测试。实验室数据将对在许多其他地质环境中研究过程的工人有用。