An Integrated Study of the Chuacus Metamorphic Belt (Guatemala): A UHP Terrane Along the North America-Caribbean Plate Boundary?

Chuacus 变质带（危地马拉）的综合研究：沿北美-加勒比板块边界的超高压地体？

• 批准号: 0510325
• 负责人: Juhn Liou
• 金额: --
• 依托单位: Stanford 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: 2005-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0510325&HistoricalAwards=false
• 关键词: Integrated; Study; Chuacus; Metamorphic; Belt

This project that is jointly supported by the Division of Earth Sciences and the Office of International Science and Engineering, is designed to study a recently discovered Chuacus terrane in Guatemala. This terrane was developed in a subduction - collision of continental microplate environment, and opens an excellent opportunity to address this problem at the southern margin of the North-American plate in the Caribbean region. The formation and exhumation of deeply subducted rocks to mantle depths has been one of the most exciting problems in the field of continental dynamics for the last two decades. This project undertakes an integrated petrochemical-geochronological study, and the specific tasks involve field study along orogen-perpendicular traverses, petrochemical characterization of eclogitic and gneissic rocks to constrain thermobaric structures, and dating of subduction, collision and exhumation of continental materials by U-Pb SHRIMP and 40Ar-39Ar methods. The proposed research provides basic information concerning the age, protolith, HP-UHP metamorphism and tectonic evolution of a continental-affiliated terrane. This gneissic terrane, with mafic eclogitic layers, contrasts with the oceanic-affiliated HP terranes to the south of Motagua Valley. The subparallel occurrence of continental-derived and oceanic-derived eclogitic terranes in central Guatemala is unique, and provides a challenge for geosciences for their formation and juxtaposition. Spatial and temporal relations of oceanic subduction followed by subudction and collision of continent may have been involved in the early development of the Caribbean plate. This project supports research of a Ph.D. student from Colombia, a Japanese post-doc, Stanford faculty members and undergraduates and personnel from both Guatemala and Mexico. An essential part of this collaborative research with local scientists will involve training young Mexican and Guatemalan scholars in scientific writing and in research methods and techniques to which they lack access at the present time. Such tri-national cooperative project will enhance mutual friendship, exchanges, and both scientific cooperation and educational training.

该项目得到了地球科学和国际科学与工程办公室的共同支持，旨在研究最近发现的危地马拉的Chuacus Terrane。 这种地形是在俯冲 - 大陆微板环境碰撞中开发的，并为加勒比地区北美板块的南部边缘提供了一个绝佳的机会来解决这一问题。在过去的二十年中，深层俯冲岩石向地幔深度的形成和挖掘一直是大陆动力学领域中最令人兴奋的问题之一。该项目进行了一项综合的石化地球学研究，具体任务涉及沿着造型的垂直遍历遍历，对持续性和片麻岩岩石的石化特性，以限制热物质结构，以及俯冲，碰撞，碰撞和U-PB BB Shrimp shrimp shrimp shrimp-arimp-ar-39ar-ar-ar-ar-39ar and-ar-ar-progiation and colisision and colisision and colisision and colisision and colisision and colisision and colisision and colisision and colisision and colisision和unightic岩石。拟议的研究提供了有关大陆附属地层的年龄，原始石，HP-UHP变质和构造演变的基本信息。这种片麻岩地层具有镁铁质地层，与Motagua山谷南部的海洋附属的HP地层形成鲜明对比。危地马拉中部的大陆衍生和海洋衍生的岩石层的次平行是独一无二的，为地球科学的形成和并置为地球科学提供了挑战。海洋俯冲的空间和时间关系，然后进行缩写和大陆碰撞，可能已经参与了加勒比板块的早期发展。 该项目支持博士学位的研究。来自哥伦比亚的学生，日本的大多数人，斯坦福大学的教职员工以及危地马拉和墨西哥的本科生和人员。与当地科学家进行的合作研究的重要组成部分将涉及培训墨西哥和危地马拉学者的科学写作以及目前缺乏访问的研究方法和技术。这种三国合作项目将增强相互友谊，交流以及科学合作和教育培训。