Testing Models of Crustal-Scale Fluid Flow and Isograd Development During Orogenesis in the Barrovian Zones, Scotland

苏格兰巴罗维亚地区造山作用期间地壳规模流体流动和等梯度发育的测试模型

• 批准号: 0509934
• 负责人: Jay Ague
• 金额: --
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-06-01 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0509934&HistoricalAwards=false
• 关键词: Testing; Models; Crustal; Scale; Fluid

Fluids produced during the heating of metamorphic rocks impact a broad array of geologic processes, including the evolution of the atmosphere and its greenhouse gas content; the formation of ore deposits; the transport of heat; the generation of magmas and volcanic activity; and the production of faults and seismicity. Proper understanding of these and other fluid-driven processes, however, requires a regional-scale understanding of fluid circulation patterns through the crust at depths in excess of 15 km below the surface during mountain-building events. Barrovian-style metamorphism is the most common type recognized worldwide and, as such, is a basic model for understanding metamorphic processes as well as the geochemical and geophysical impacts of fluids comprising water, carbon dioxide, dissolved solutes, and other constituents. The proposed work focuses on the Barrovian type locality of Scotland, and will use the elemental and isotopic mass transfer recorded in the rocks together with numerical models constrained by field- and laboratory-based initial and boundary conditions to test hypotheses of fluid flow, heat transport, and magma formation during metamorphism. Three field areas spanning the crustal depth range of ~15 to ~35 km will be examined, with a particular focus on the Highland Boundary Fault. This crustal-scale structure extends ~250 km across Scotland and is clearly a fundamental control on the spatial distribution of metamorphic rock types in the Barrovian sequence. Nonetheless, despite over a century of study, its role in the geochemical and tectonic evolution of earth's crust during the global-scale, Caledonian-Appalachian mountain building episode remains controversial and poorly resolved. Human resources will be developed because field- and laboratory-based Ph.D. graduate student as well as undergraduate B.S. thesis research is critical to the project. PI Ague is leading a complete renovation of the rock and mineral section of the Yale Peabody Museum, and this will allow integration of new research results into Earth science displays viewed by over 150,000 visitors annually. A large fraction of these visitors are schoolchildren, many of whom live in the urban centers of New Haven, Bridgeport, and other Connecticut cities. The exhibition would be the only one of its kind in Connecticut or Rhode Island and, as such, serve as a critical regional scientific and educational resource for the Museum's diverse audiences. A series of books and accompanying CDs/DVDs on Earth Science for K-6 grade students and an interactive web site will be produced to coincide with the exhibition; the project will support production of one of the books.

变质岩加热过程中产生的流体影响广泛的地质过程，包括大气的演变及其温室气体含量；矿床的形成；热量的传输；岩浆的产生和火山活动；以及断层和地震活动的产生。然而，要正确理解这些和其他流体驱动过程，需要对造山事件期间地表以下 15 公里以上深度的地壳中的流体循环模式有区域性的了解。巴罗夫式变质作用是全世界公认的最常见的类型，因此是理解变质过程以及由水、二氧化碳、溶解的溶质和其他成分组成的流体的地球化学和地球物理影响的基本模型。拟议的工作重点是苏格兰的巴罗维类型地点，并将使用岩石中记录的元素和同位素质量传递以及受现场和实验室初始和边界条件约束的数值模型来测试流体流动、热传输的假设，以及变质作用期间岩浆的形成。将检查横跨地壳深度范围约 15 至约 35 公里的三个野外区域，特别关注高地边界断层。这种地壳尺度的结构横跨苏格兰延伸约 250 公里，显然是对巴罗阶序中变质岩类型空间分布的基本控制。尽管如此，尽管经过一个多世纪的研究，其在全球范围内的喀里多尼亚-阿巴拉契亚造山事件中地壳地球化学和构造演化中的作用仍然存在争议，且尚未得到很好的解决。人力资源将得到开发，因为基于现场和实验室的博士学位。研究生以及本科生论文研究对于该项目至关重要。 PI Ague 正在领导对耶鲁大学皮博迪博物馆的岩石和矿物部分进行全面翻修，这将使新的研究成果融入到每年有超过 150,000 名游客观看的地球科学展览中。这些游客中很大一部分是学童，其中许多人居住在纽黑文、布里奇波特和康涅狄格州其他城市的市中心。该展览将是康涅狄格州或罗德岛州唯一的此类展览，因此成为博物馆不同观众的重要区域科学和教育资源。为配合展览，将制作一系列针对 K-6 年级学生的地球科学书籍和随附的 CD/DVD，以及一个互动网站；该项目将支持其中一本书的制作。