Collaborative Research: A New Sanidine-Liquid Hygrometer: Experiments, Calibration and Applications

合作研究：新型Sanidine 液体湿度计：实验、校准和应用

• 批准号: 2039271
• 负责人: Gordon Moore
• 金额: $ 22.14万
• 依托单位: Jacobs Technology Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2039271&HistoricalAwards=false
• 关键词: Collaborative; Research; New; Sanidine; Liquid

The composition of potassium feldspar, a common in continental magmatic rocks, can record the intensive conditions it experiences as it is growing from a melt. The research team will calibrate a water-dependent geothermometer based on sanidine compositions. The calibration will be applicable to determine the conditions of crystallization of some of the world's most-important and best-studied suites, including voluminous (1000 cubic kilometers) ignimbrites and batholithic plutons. Six undergraduates from Sonoma State, a Hispanic-serving institution, will participate in the project, including 3 from a program that promotes STEM fields to under-represented groups. Three students from a high-school internship program will participate. Three undergraduates from Davis, a Hispanic-serving institution, will also participate. This project will generate new phase equilibria results, a hygrometer applicable to sanidine- and anorthoclase-bearing magmas, and a new method for estimating the equilibration temperatures and H2O contents of plutonic rocks. Silicic magmas represent the final products of planetary differentiation and can erupt in enormous volumes. Voluminous silicic eruptions require that short- or long-lived volumes of mush (crystals + melt) must exist in the crust. However, there is ongoing debate about the origins and lifespans of such systems, with conflicting views from numerical models, isotopic and trace element data, and the plutonic and volcanic records. The intensive variables recorded by potassium feldspar have been underutilized in this debate, largely due to a lack of appropriate models. This project will involve experimental calibration of a new K-feldspar hygrometer/thermometer that will constrain the conditions (i.e., temperature, pressure, H2O content) of formation, storage, and extraction of a broad range of silicic magmas. Six undergraduates from Sonoma State, a Hispanic-serving institution, will participate in the project, including 3 from a program that promotes STEM fields to under-represented groups. Three students from a high-school internship program will participate. Three undergraduates from Davis, a Hispanic-serving institution, will also participate.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

大陆岩石岩石中常见的钾长石的组成可以记录其从熔体中生长的强化条件。研究团队将根据Sanidine组成校准依赖水的地热计。该校准将适用于确定世界上一些最重要，最研究的套件的结晶状况，包括大量的（1000立方公里）的Ignimbrites和Batholethic Plutons。来自西班牙裔服务机构索诺玛州的六名大学生将参加该项目，其中包括3个计划，该计划将STEM领域推广到代表性不足的群体。来自高中实习计划的三名学生将参加。西班牙裔服务机构戴维斯的三名大学生也将参加。该项目将产生新的平衡结果，一种适用于sanidine和Anorthoclase的岩浆的湿度计，以及一种估计plutononic岩石的平衡温度和H2O含量的新方法。硅质岩浆代表了行星分化的最终产物，并且会爆发巨大的体积。大量的硅质喷发要求地壳中必须存在短寿命或长寿命的糊状物（晶体 +熔体）。但是，关于此类系统的起源和寿命的辩论正在进行，具有数值模型，同位素和跟踪元素数据以及Plutonic和火山记录的观点相互矛盾。在这场辩论中，钾长石记录的密集变量在很大程度上没有利用，这在很大程度上是由于缺乏适当的模型。该项目将涉及对新的K-Feldspar湿度计/温度计的实验校准，该校准将限制形成，存储和提取各种硅质岩浆的条件（即温度，压力，H2O含量）。来自西班牙裔服务机构索诺玛州的六名大学生将参加该项目，其中包括3个计划，该计划将STEM领域推广到代表性不足的群体。来自高中实习计划的三名学生将参加。来自西班牙裔服务机构戴维斯的三名大学生也将参加。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评估标准通过评估来支持的。