Collaborative Research: Internally-Consistent Model for Trace and Major Element Evolution in Open System Magma Bodies: Merging EC-RAFC and MELTS

合作研究：开放系统岩浆体中痕量和主要元素演化的内部一致模型：合并 EC-RAFC 和 MELTS

• 批准号: 0440010
• 负责人: Wendy Bohrson
• 金额: $ 19.68万
• 依托单位: Central Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440010&HistoricalAwards=false
• 关键词: Collaborative; Research; Internally; Consistent; Model

Geological and geochemical data provide definitive evidence that magma chambers are inherently open systems subject to interaction with adjacent wallrock (crustal assimilation), magma recharge, and crystal formation (fractional crystallization). The objective of this research is to develop a broadly applicable computational geochemical tool, the Magma Chamber Simulator (MCS), to describe the compositional, mass, and thermal evolution of open system magma bodies undergoing simultaneous recharge, crustal assimilation, and fractional crystallization. The basis of the MCS is a thermodynamic description of a magmatic system that is subject to energy, mass and species conservation, and construction of the MCS will proceed via reformulation and integration of two extant modeling tools, MELTS and Energy-Constrained Recharge, Assimilation Fraction Crystallization (EC-RAFC). Application of the MCS will allow field, geochemical, petrological, and geochronological studies of magmatic systems to be placed in a quantitative framework that will enable predictions about the behaviors of magmatic systems. Through application of the MCS to the diverse array of magmatic systems represented on Earth, progress will be made on the fundamental question of how magma diversity is achieved. For example, questions related to how magmas diversify in classical settings such as ocean islands (Hawaii), subduction zones (Arenal), continental flood basalts (Parana), and layered mafic intrusions (Bushveld Complex) will be explored. The MCS will be available on a number of web sites for use by professional researchers as well as graduate and undergraduate students, thereby providing the geochemical and petrological community with a user-friendly desktop computational tool for quantitatively investigating the evolution of dynamic, open-system magma bodies. As part of the outreach activities, exercises for undergraduate/graduate petrology classes will be developed in collaboration with students. These exercises will assist students in developing skills in computational modeling as well as use of quantitative analysis of geologic data to answer relevant questions in igneous petrology. Thus, this work will not only impact the research of a large number of professional petrologists/geochemists, but it will also contribute to the training of students in research, curriculum development, and collaborative endeavors.

地质和地球化学数据提供了确凿的证据，表明岩浆房本质上是开放的系统，受到与邻近围岩的相互作用(地壳同化)、岩浆补给和晶体形成(分离结晶)的影响。这项研究的目的是开发一个广泛适用的计算地球化学工具-岩浆室模拟器(MCS)，以描述同时经历补给、地壳同化和分离结晶的开放系统岩浆体的成分、质量和热演化。MCS的基础是对服从能量、质量和物种守恒的岩浆系统的热力学描述，MCS的构建将通过重新制定和整合现有的两种模拟工具--熔体和能量受限的补给、同化分数结晶(EC-RAFC)来进行。MCS的应用将使岩浆系统的野外、地球化学、岩石学和地质年代学研究被置于一个量化框架中，从而能够预测岩浆系统的行为。通过将MCS应用于地球上所代表的各种岩浆系统阵列，将在如何实现岩浆多样性这一根本问题上取得进展。例如，将探索与经典环境中的岩浆如何多样化有关的问题，如海洋岛屿(夏威夷)、俯冲带(Arenal)、大陆泛滥玄武岩(Parana)和层状镁铁质侵入体(Bushveld杂岩)。MCS将在许多网站上提供，供专业研究人员以及研究生和本科生使用，从而为地球化学和岩石界提供一个用户友好的桌面计算工具，用于定量研究动态、开放系统岩浆体的演化。作为外展活动的一部分，将与学生合作制定本科生/研究生岩石学课程的练习。这些练习将帮助学生发展计算建模的技能，以及使用地质数据的定量分析来回答火成岩岩石学的相关问题。因此，这项工作不仅将影响大量专业岩石学家/地球化学家的研究，还将有助于培养学生的研究、课程开发和合作努力。