EAR-PF: Unleashing the petrogenetic potential of sanidine using a combined compositional, experimental, and 3D textural approach

EAR-PF：使用组合的成分、实验和 3D 结构方法释放 Sanidine 的成岩潜力

• 批准号: 1952808
• 负责人: Hannah Shamloo
• 金额: $ 17.4万
• 依托单位: Shamloo, Hannah I
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1952808&HistoricalAwards=false
• 关键词: EAR; PF; Unleashing; petrogenetic; potential

Dr. Hannah Shamloo has been granted an NSF EAR Postdoctoral Fellowship to carry out research and educational plans at Oregon State University alongside mentor, Professor Adam Kent. This investigation will examine the processes that produce some of the largest volcanic eruptions known, through the study of minerals present in erupted magmas. The tool developed will help to accurately and quantitively resolve the many processes recorded in zoned minerals that lead to large eruptions. The information for relating magmatic/volcanic processes obtained from individual Barium (Ba) zoning in minerals is critical to the real-time volcano monitoring efforts of future eruptions. This study will consist of three components, (1) quantifying chemical characteristics of natural zoned sanidine from supervolcanoes, (2) perform novel 3D textural characterization of Ba zoning in sanidine, and (3) conduct a series of experiments under relevant conditions to shallow and evolved magmatic systems to constrain the behavior of Ba and other trace elements in sanidine. Additionally, the education plan will entail research opportunities for undergraduates related to this project, teaching opportunities with a focus on minorities in STEM, and outreach via social media.This investigation will better resolve large-scale processes recorded in zoned minerals including pluton formation, initiation of volcanic eruptions, and formation of continental crust. Although the zoning of Ba in sanidine and other alkali-feldspar has been widely documented since at least the 1970’s, its use as a quantitative tool is severely limited by a lack of fundamental data, and as a result, hypotheses based on Ba zoning are often difficult to test. This study will couple in-situ major- and trace-element characterization of natural zoned sanidine from a variety of supervolcanoes using laser ablation ICP-MS and electron microprobe, with 3D textural characterization of Ba zoning using high-resolution X-ray microtomography. Additionally, a series of experiments will be performed under the relevant conditions to shallow and evolved magmatic systems using cold-seal pressure vessels and non-end-loaded piston cylinders to quantify the partitioning behavior of Ba in sanidine and silicic melt. This investigation will also develop a novel technique to study chemical zoning in crystals in 3D rather than the traditional 2D approach often used in petrology that can lead to additional uncertainty. Broader impacts include research opportunities for undergraduate students that will focus on recruiting members of unrepresented minorities in STEM majors. This project received co-funding from the Petrology and Geochemistry program in the division of Earth Sciences.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.

汉娜·沙卢（Hannah Shamloo）博士已获得NSF耳朵博士后奖学金，以与导师亚当·肯特（Adam Kent）一起在俄勒冈州立大学（Oregon State University）进行研究和教育计划。这项投资将通过对爆发的岩浆中存在的矿物研究来研究产生一些已知的最大火山喷发的过程。开发的工具将有助于准确，定量地解决导致大型喷发的矿物质中记录的许多过程。与矿物质中单个钡（BA）分区获得的岩浆/火山过程有关的信息对于未来火山的实时监测工作至关重要。这项研究将由三个组成部分组成，（1）量化Supervolcanoes天然划分的Sanidine的化学特性，（2）在Sanidine中执行BA分区的新型3D纹理表征，以及（3）在相关条件下进行一系列实验，以抑制BA和其他痕量元素和其他Sanidine sanidine insanidine insanidine insanidine in sanidine in sanidine in sanidine in sanidine in sanidine insanide的行为。此外，教育计划还将为与该项目相关的大学生提供研究机会，关注STEM的教学机会以及通过社交媒体进行外展的教学机会。这项投资将更好地解决在Pluton形成，包括火山爆发的启动以及连续甲壳的矿物质矿物中记录的大规模过程。尽管至少自1970年代以来，在Sanidine和其他碱性 - 费尔德斯Par的BA进行了分区，但其用作定量工具的使用受到了缺乏基本数据的严重限制，因此，基于BA分区的假设通常很难进行测试。这项研究将使用激光消融ICP-MS和电子微探针对天然分区的天然分区sanidine进行原位主要和微量元素表征，并使用高分辨率X射线微观摄影对BA分区进行3D质地表征。此外，将在相关条件下使用冷磁系统和进化的磁系统进行一系列实验，并使用冷 - 密封压力容器和非末端的活塞缸，以量化BA在Sanidine和Siliconic熔体中的分配行为。这项投资还将开发一种新型技术，用于研究3D中晶体中的化学分区，而不是岩石学经常使用的传统2D方法，这可能导致额外的不确定性。更广泛的影响包括针对本科生的研究机会，这些学生将专注于招募STEM专业的无代表性少数民族的成员。该项目获得了地球科学系的岩石学和地球化学计划的共同资助。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响评估标准，被视为通过评估而被视为珍贵的支持。