Building mountain belts - the Appalachian model

构建山脉——阿巴拉契亚模式

• 批准号: RGPIN-2016-04860
• 负责人: Barr, Sandra
• 金额: $ 2.4万
• 依托单位: Acadia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633729
• 关键词: Building; mountain; belts; Appalachian; model

Each mountain belt on Earth is unique, but similar processes likely took place in the formation of all. One of those processes is the accretion of exotic fragments or terranes. My research program focuses on identifying such fragments in the northern part of the Appalachian mountain belt, interpreting from where on the Earth they were derived, and understanding how, when, and why they were attached to ancestral North America. My working model recognizes fragments in the northern Appalachian orogen and correlative belts in Europe derived from three separate microcontinents named Meguma, Avalonia, and Ganderia. We have made much progress toward understanding these fragments, but problems remain. This proposal focuses on two specific problem areas: (1) the part of Ganderia in central Cape Breton Island and (2) the part of Avalonia in northern mainland Nova Scotia. I will use field mapping as a basis to better define rock units, followed by mineral, textural, and chemical studies, dating, and isotopic analyses of carefully collected representative samples to decipher the ages and origins of the rocks in these areas.

地球上的每条山脉带都是独一无二的，但所有山脉带的形成过程可能都发生了类似的过程。这些过程之一是外来碎片或地体的增生。我的研究项目侧重于识别阿巴拉契亚山脉北部的此类碎片，解释它们在地球上的来源，并了解它们如何、何时以及为何附着在祖先的北美。我的工作模型识别了北阿巴拉契亚造山带和欧洲相关带的碎片，这些碎片源自三个独立的微大陆，即梅古玛、阿瓦隆尼亚和甘德里亚。我们在理解这些碎片方面取得了很大进展，但问题仍然存在。该提案重点关注两个具体问题领域：(1) 布雷顿角岛中部的甘德里亚部分和 (2) 新斯科舍省大陆北部的阿瓦隆尼亚部分。我将使用野外测绘作为基础来更好地定义岩石单元，然后对仔细收集的代表性样本进行矿物、结构和化学研究、年代测定和同位素分析，以破译这些地区岩石的年龄和起源。