Collaborative Research: Characterizing and Modeling Crustal Recycling

合作研究：地壳回收的表征和建模

• 批准号: 1841806
• 负责人: Mark Behn
• 金额: $ 0.74万
• 依托单位: Boston College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-06-01 至 2019-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1841806&HistoricalAwards=false
• 关键词: Collaborative; Research; Characterizing; Modeling; Crustal

Recycling of Earth's crust back down into the deep Earth has been invoked to explain a wide variety of Earth processes, including changes in the forces that move tectonic plates, and how the thickness and composition of Earth's crust evolved. All of these processes take place at depths inaccessible to humans. A volcanic eruption in the Pamir Mountains of Tajikistan has brought to light pieces of rock from 90 km deep in Earth that can be used to test recycling-related hypotheses. This project will provide training and research opportunities for graduate student Madeline Shaffer and several undergraduate students. Visits to local elementary schools will expose potential future scientists to Earth science. Continued development of the laser-ablation split-stream technique will benefit the broad range of visitors to their laboratory.This collaborative US-Tajik-Romanian project has a two-pronged approach: 1) Laboratory geochronology and petrology that will constrain the timescale of recycling, and the compositions, densities and wavespeeds of the recycling materials. With some assumptions about protolith composition, the evolution in these physical properties can be calculated. 2) Geodynamic modeling of recycling crustal sections with different compositions and layers in different thermal gradients. The models will yield the calculated evolution of the physical properties of recycling crust and determine the types of crustal sections that may recycle. Because the Pamir-Tibetan Plateau is an archetypal continent-continent collision, ideas developed there can be applied globally.

将地球的地壳回收回到深地球上，以解释各种地球过程，包括移动构造板的力的变化，以及地球地壳的厚度和成分如何演变。所有这些过程都发生在人类无法访问的深处。塔吉克斯坦帕米尔山脉的火山喷发使从地球深90公里深的岩石散发出来，可用于测试与回收相关的假设。该项目将为研究生Madeline Shaffer和几位本科生提供培训和研究机会。访问当地小学将使潜在的未来科学家接触地球科学。激光裂开流技术的持续开发将使其实验室的广泛访问者受益。该协作的US-TAJIK-ROMANIAN项目具有两种方便的方法：1）实验室地质学和岩石学将限制回收的时间尺度，以及构成，稠密的，稠密的材料。有了一些关于原石组成的假设，可以计算这些物理特性中的演变。 2）在不同的热梯度中具有不同组成和层的回收地壳切片的地球动力模型。这些模型将产生回收外壳的物理特性的计算演变，并确定可能回收的地壳切片的类型。由于帕米尔 - 藏高原是一种原型的欧洲大陆碰撞，因此可以在此处采用的想法。