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年美国复苏和再投资法案（公法111-5）资助的。地球内部的大多数地质过程都是由热量传递驱动的。这些过程包括岩浆生成、火山作用、地热系统和几种矿床的生成。目前用于研究这些过程的数学和计算机模型通常对岩石的几个基本特性假设固定的值，如热容量，即岩石保持热量的能力，热扩散率，即岩石传递热量的能力，以及熔化岩石所需的热量。许多类型岩石的这些属性值，特别是它们如何随温度变化，仍然知之甚少，研究的一个方面集中在实验室的实验测量上。这些新的数值将被应用于通过持续的或间歇的岩浆注入来模拟地壳内具有良好特征的岩浆体的生长，以及这些岩体的生长和结晶如何驱动周围岩石和地热系统的变质作用。该项目将提供培训学生和年轻科学家进行研究的机会，这些研究将包含实验室、计算和现场组成部分。从多个角度观察复杂自然过程的能力是培养成功的地球科学家的关键。对岩石的温度依赖特性的改进数据的需求可以纳入综合热模型，这是由于最近对花岗岩岩体如何形成的理解取得了进展，并且由于侵入诱发的变质和地热系统通常比简单的导电和对流热模型通常预测的持续时间更长。人们已经有了一种范式的转变，从把岩体看作是像底辟一样在一个单一脉冲中形成的大量岩浆，到把岩体看作是经过长时间生长的天体，从数万年到数百万年不等。岩浆的长时间注入会影响岩体的结晶史和变质-地热系统的持续时间，而这些都是由热传递控制的。该项目的目的是确定矿物和岩石的温度依赖特性，并开发岩浆-变质-地热系统的综合数值模型。该模型将通过检查布莱克山哈尼峰花岗岩岩体的生长以及其生长如何影响其热光圈来进行实地测试。实验室数据将对研究许多其他地质环境中的过程的工作人员有用。