Collaborative Research: Displacement history of the Pearya terrane, Ellesmere Island - evaluating a strike-slip origin for the Canadian Arctic margin

合作研究：埃尔斯米尔岛 Pearya 地体的位移历史 - 评估加拿大北极边缘的走滑起源

基本信息

批准号：
1650152
负责人：
Justin Strauss
金额：
$ 14.17万
依托单位：
Dartmouth College
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-05-01 至 2020-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1650152&HistoricalAwards=false
关键词：
Collaborative Research Displacement history Pearya

项目摘要

This project is a structural, petrologic and geochronologic study of basement rocks that comprise the Pearya terrane of Ellesmere Island, which forms the northernmost landmass of North America. This tectonic terrane has geologic affinities with continental crust in Svalbard and Greenland. It is postulated that the Pearya terrane is the best example along the Canadian Arctic margin of a crustal fragment that has been displaced by plate tectonic processes. A proposed tectonic model for the origin of the Pearya terrane (the Paleozoic Northwest Passage model) postulates that many exotic or far-travelled geologic terranes that make up the northwestern Cordillera (e.g. Alaska) originated in the Caledonian orogenic belt shared by Greenland and Scandinavia, and subsequently traveled westward on a strike-slip fault to their current location about 400 million years ago. The lack of documentation on the timing and movement sense of the Pearya terrane severely limits understanding of the tectonic evolution of the Arctic margin of North America, leaving room for recent models that claim Pearya was stationary and was not the result of tectonic displacement. This project includes field observations and sample collection from remote southern boundary of the Pearya terrane that will be used to test these models. The project is part of the 2017 Circum-Arctic Structural Events Expedition organized by the German Federal Institute for Geosciences and Natural Resources, who will provide logistical support for the fieldwork. The project will involve international collaboration with scientists from five countries. In addition to the scientific contributions of the project, the study will contribute to training of graduate and undergraduate students in an important science, technology, engineering and mathematics (STEM) discipline, which is important in contributing to the enhanced compatibility of the U.S. workforce. The project will also contribute to broadening of underrepresented groups in STEM. Research results will be shared with the public through lectures and will be published in the peer reviewed scientific literatures and presentations at professional society meetings. Understanding the geological evolution of the North American Arctic margin is critical to informing important scientific, political and economic issues associated with the Arctic region. This award is cofunded by the NSF Office of International Science and Engineering.The ultimate goal of this project is to establish a stratigraphic, structural and metamorphic framework for the evolution of the complex southern boundary of the Pearya terrane. The study entails integrated kinematic, petrochronologic and argon-argon thermochronologic analysis of the crystalline basement and major faults at the southern Pearya terrane margin; and detailed stratigraphic comparison across the terrane boundary through sandstone petrography, detrital zircon uranium-lead and hafnium analysis, and major, trace element and neodymium isotope geochemistry on mudstone. Although the Canadian Arctic margin is often cited as an example of large magnitude terrane translation, little is known about the structures that may have accommodated such profound displacement. The project will evaluate possible strike-slip tectonics in light of structures associated with transpression, which may reconcile the earlier observations of straight contraction. The results of this study will provide critical timing on the age of metamorphism and the early ductile history of the shear zones in order to see through the pervasive overprinting. The principal investigators will also evaluate the stratigraphy of the overlap assemblage in different fault blocks to determine whether it is a single assemblage or, in fact, time correlatives of spatially separate depositional systems. By producing a robust data set tied to the geology, this project will help discriminate among the disparate models that currently exist for the Pearya terrane and the larger tectonic development of the Arctic.

该项目是地下室岩石的一项结构性，岩石学和地球学研究，包括埃尔斯米尔岛（Ellesmere Island）的Pearya Terrane，构成了北美最北端的地块。这个构造地层具有地质亲和力，在斯瓦尔巴德和格陵兰岛具有大陆地壳。据推测，皮尔雅地道是沿加拿大北极边缘的最好的例子，该地壳碎片已被板块构造过程所取代。 A proposed tectonic model for the origin of the Pearya terrane (the Paleozoic Northwest Passage model) postulates that many exotic or far-travelled geologic terranes that make up the northwestern Cordillera (e.g. Alaska) originated in the Caledonian orogenic belt shared by Greenland and Scandinavia, and subsequently traveled westward on a strike-slip fault to their current location about 400 million years ago. 缺乏关于皮尔雅地道的时机和运动意识的文献，严重限制了北美北极边缘构造演变的理解，为最近的模型留下了空间，这些模型声称Pearya是固定的，不是构造流离失所的结果。该项目包括来自Pearya Terrane的远程南部边界的现场观测和样品收集，该图将用于测试这些模型。该项目是德国联邦地球科学与自然资源研究所组织的2017年北极结构活动探险队的一部分，他们将为实地调查提供后勤支持。该项目将涉及与来自五个国家的科学家的国际合作。除了该项目的科学贡献外，该研究还将有助于对重要科学，技术，工程和数学（STEM）学科的研究生和本科生的培训，这对于有助于增强美国劳动力的兼容性很重要。该项目还将有助于扩大STEM中代表性不足的群体。研究结果将通过讲座与公众共享，并将在专业社会会议上的同行评审的科学文献和演讲中发表。了解北美北极边际的地质演变对于告知与北极地区有关的重要科学，政治和经济问题至关重要。该奖项由NSF国际科学与工程办公室造成，该项目的最终目标是为Pearya Terrane的复杂南部边界的发展建立地层，结构和变质框架。该研究需要对晶体地下室的综合运动学，石化和阿贡热量分析分析，以及南部皮尔塔地层边缘的主要断层。并通过砂岩岩石摄影，碎屑锆石铀铅和hafnium分析以及泥岩上的主要，痕量元素和新近同位素地球化学的详细地层比较。尽管加拿大北极边缘通常被认为是大量地层翻译的一个例子，但对可能容纳如此深刻的位移的结构知之甚少。该项目将根据与迁移相关的结构来评估可能的滑移构造，这可能会调和较早的直接收缩观察结果。这项研究的结果将为变质时代和剪切区的早期延性历史提供关键时机，以透过广泛的过度打印。主要研究人员还将评估不同断层块中重叠组合的地层，以确定它是单个组合还是实际上是空间分开沉积系统的时间相关性。通过生成与地质相关的强大数据集，该项目将有助于区分目前为Pearya Terrane存在的不同模型和北极的较大构造发展。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

U‐Pb zircon dating of metaigneous rocks from the Nordbreen Nappe of Svalbard’s Ny‐Friesland suggests their affinity to Northeast Greenland

对斯瓦尔巴群岛 Ny弗里斯兰北布林推覆岩的变火成岩进行 U-Pb 锆石测年表明它们与格陵兰岛东北部有密切关系

DOI：
10.1111/ter.12422
发表时间：
2019
期刊：
Terra Nova
影响因子：
2.4
作者：
Bazarnik, Jakub;Majka, Jarosław;McClelland, William C.;Strauss, Justin V.;Kośmińska, Karolina;Piepjohn, Karsten;Elvevold, Synnøve;Czupyt, Zbigniew;Mikuš, Tomáš
通讯作者：
Mikuš, Tomáš

Neoproterozoic stratigraphy and provenance of Wedel Jarlsberg Land, Svalbard: New insights into the origin and transport history of the Southwestern Province

斯瓦尔巴群岛威德尔贾尔斯贝格地的新元古代地层学和起源：对西南省起源和运输历史的新见解

DOI：
发表时间：
2017
期刊：
Abstracts - Geological Society of America
影响因子：
0
作者：
Wala, V.T.;Ceaser, I.M.;Ziemniak, G.;Faehnrich, K.;Meyer, E.E.;Czerny, J.;Majka, J.;McClelland, W.C.;Strauss, J.V.
通讯作者：
Strauss, J.V.

Detrital zircon geochronology and provenance of the Hecla Hoek Succession of northeastern Svalbard, Norway

挪威斯瓦尔巴群岛东北部赫克拉霍克继承的碎屑锆石年代学和物源

DOI：
发表时间：
2017
期刊：
Abstracts - Geological Society of America
影响因子：
0
作者：
Allen, T.J.
通讯作者：
Allen, T.J.

Neoproterozoic stratigraphy of the Southwestern Basement Province, Svalbard: Constraints on the Proterozoic–Paleozoic evolution of the North Atlantic-Arctic Caledonides

斯瓦尔巴群岛西南基底省的新元古代地层学：对北大西洋-北极喀里多尼德群岛元古代-古生代演化的制约

DOI：
发表时间：
2018
期刊：
Transactions - American Geophysical Union
影响因子：
0
作者：
Wala, V.T.;Strauss, J.V.;Majka, J.;Ziemniak, G.;Faehnrich, K.;Meyer, E.E.;Czerny, J.;Bellefroid, E.J.;Feng, X.;McClelland, W.C.
通讯作者：
McClelland, W.C.

The Tonian-Cryogenian transition in Northeastern Svalbard