Collaborative Research: An Early Cambrian Tectonothermal Event in the Smith River Allochthon of SW Virginia: Implications for Southern Appalachian Tectonics

合作研究：弗吉尼亚州西南部史密斯河异地松的早寒武纪构造热事件：对南阿巴拉契亚构造的影响

• 批准号: 0124212
• 负责人: Robert Tracy
• 金额: $ 2.82万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-02-01 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0124212&HistoricalAwards=false
• 关键词: Collaborative; Research; Early; Cambrian; Tectonothermal

Delineation of crustal elements of different origins and histories found in ancient orogenic belts is a prerequisite to meaningful tectonic analysis. In the S. Appalachian orogen, a classic collisional system, it has proven difficult to convincingly assign units to Laurentia or to the opposing continental mass, Gondwana. Lack of clear-cut evidence has stymied full understanding of the otherwise well-known belt that has been instrumental in the development of major tectonic concepts. This project will investigate the hypothesis that the Smith River Allochthon in the Piedmont Zone, previously thought to be of peri-Laurentian or transitional affinity is, in fact, of exotic (Gondwana) origin. Results are of considerable local importance, and because the Appalachians provide an influential model for interpretation of other ancient tectonic belts, has broad significance.

圈定古造山带中不同起源和历史的地壳成分是进行有意义的构造分析的先决条件。在圣阿巴拉契亚造山带，一个经典的碰撞系统，很难令人信服地将单元分配给劳伦西亚或相反的大陆块冈瓦纳。缺乏明确的证据阻碍了对这条众所周知的带的充分理解，而这条带在主要构造概念的发展中起着重要作用。该项目将调查一种假设，即皮埃蒙特地区的史密斯河Allochthon，以前被认为是近劳伦森或过渡性的，实际上是外来的（冈瓦纳）起源。结果具有重要的局部意义，并为其他古构造带的解释提供了有影响的模型，具有广泛的意义。