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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=644690
• 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.******This work is important to geoscientists who work in areas from which components of the mountain belt may have been derived and/or to which former components may have been dispersed after the break-up of Pangaea. More broadly, the work is important to those who are trying to understand the fundamental processes of mountain building as exemplified in the northern Appalachian orogen. The relevance of my work is demonstrated by the extent of my collaborations with geoscientists from not only Canada but also the USA, UK, Spain, France, and Germany. My research involves students at both the undergraduate and graduate (MSc) levels and hence funding for students is the largest component of my budget. My students learn how to interpret rocks in the field, acquire and use analytical data, make public presentations, and write scientific papers. We anticipate that the new results, integrated with those from previous work and from other areas, will lead to a definitive and internally consistent model for northern Appalachian mountain building, with broad applicability to other mountain belts. Such understanding should lead to increased and more successful mineral exploration programs, especially if, as we anticipate, rock units related to those in mineral-rich areas in central Newfoundland and New Brunswick can be demonstrated to be present in Cape Breton Island. **

地球上的每一个山脉都是独一无二的，但所有山脉的形成过程都可能发生类似的过程。这些过程之一是外来碎片或碎片的吸积。我的研究项目主要集中在阿巴拉契亚山脉带北方的这些碎片，解释它们在地球上的来源，并了解它们是如何，何时以及为什么附着在祖先北美。我的工作模型识别出阿巴拉契亚造山带北方的碎片和欧洲的相关带，它们来自三个独立的微大陆，名为Meguma，Avalonia和Ganderia。 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。 该提案侧重于两个具体问题地区：（1）布雷东角岛中部的甘德里亚部分和（2）新斯科舍省大陆北方的阿瓦隆尼亚部分。 我将使用实地测绘作为基础，以更好地定义岩石单元，其次是矿物，纹理和化学研究，测年，以及仔细收集的代表性样本的同位素分析，以破译这些地区岩石的年龄和起源。这项工作对于那些在可能产生山脉带成分和/或在泛大陆分裂后以前的成分可能分散到的地区工作的地球科学家来说很重要。 更广泛地说，这项工作对那些试图了解阿巴拉契亚山脉北方造山带的基本造山过程的人很重要。 我与来自加拿大、美国、英国、西班牙、法国和德国的地球科学家的合作程度证明了我工作的相关性。 我的研究涉及本科生和研究生（硕士）水平的学生，因此学生的资金是我预算的最大组成部分。我的学生学习如何在野外解释岩石，获取和使用分析数据，进行公开演讲，并撰写科学论文。 我们预计，新的结果，与以前的工作和其他领域的综合，将导致一个明确的和内部一致的模型，北方阿巴拉契亚山脉建设，广泛适用于其他山区带。 这样的理解应该导致增加和更成功的矿产勘探计划，特别是如果，正如我们所料，在中部纽芬兰和新玩法矿产丰富的地区的岩石单位可以证明是目前在布雷东角岛。 **