MORB Construction Processes: Plutonic to Volcanic Connections in Plagioclase Ultraphyric Basalts (PUBs)

MORB 施工过程：斜长石超火玄武岩 (PUB) 中的深成岩与火山的连接

• 批准号: 0927773
• 负责人: Frank Tepley
• 金额: $ 35.74万
• 依托单位: Oregon State 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: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0927773&HistoricalAwards=false
• 关键词: MORB; Construction; Processes; Plutonic; Volcanic

The compositions of mid ocean ridge basalts (MORBs) and related volcanic rocks are one of the primary observational datasets used to illuminate melting processes that ultimately lead to formation of ocean crust and processes like global geochemical cycling and plate tectonics. Most MORB, however, is modified by processes that occur in the upper mantle and oceanic crust. To constrain the processes that modify the composition of MORB during its residence and transit from the mantle through the oceanic crust, this research will carry out a geochemical and textural study of plagioclase-rich MORB from ultra-slow and intermediate spreading-rate mid ocean ridges. The focus of the work will be on plagioclase from plagioclase-ultraphyric basalts. This mineral is a potentially rich and largely unexploited recorder of magma temperature, composition, mass balance and time. Analytical work will include a combination of in situ analytical chemical and isotopic analysis techniques, analyses of major and trace element compositions of the lavas, textural studies, determination of trace element diffusion profiles, crystal size distributions, and other approaches. Broader impacts of the work are support of a student and an early career faculty member.

海洋山脊玄武岩（MORB）和相关火山岩的组成是用于照亮熔融过程的主要观察数据集之一，最终导致海壳形成和诸如全球地球化学循环和板块构造的过程。然而，大多数医生是通过上地幔和海洋壳中发生的过程来改变的。 为了限制MORB在其居住期间的组成和从地幔过渡到海洋壳的过程，这项研究将对来自超慢的和中间扩散率中海脊进行地球化学和质地研究。 这项工作的重点将放在斜长石 - 硫代玄武岩的斜长石上。 该矿物质是岩浆温度，成分，质量平衡和时间的潜在富裕且在很大程度上没有开发的记录器。 分析工作将包括原位分析化学和同位素分析技术的结合，熔岩的主要和微量元素组成的分析，纹理研究，痕量元素扩散曲线的确定，晶体大小分布以及其他方法。 这项工作的更广泛影响是学生和早期职业教师的支持。