加拿大努纳武特Wager剪切带的特征:来自微观结构和地质年代学的见解

IF 1.3 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Canadian Journal of Earth Sciences Pub Date : 2023-01-01 DOI:10.1139/cjes-2022-0031

I. Therriault, K. Larson, H. M. Steenkamp, F. Apen, R. Graziani, M. Soret, C. Guilmette, J. Cottle

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引用次数: 0

摘要

Wager剪切带是位于Nunavut哈德逊湾西北部Rae域元古代和太古代岩石中的一个长约450公里的高应变带。新的野外填图和微观构造分析，结合钛矿和磷灰石年代学，确定了元古代韧性变形的样式、运动学和时间。结果表明，Wager剪切带在约1.75 ~ 1.74 Ga之间发生高温变形，并在约1705 Ma时通过磷灰石U-Pb闭合(425 ~ 530℃)进行后运动学冷却。这些新数据表明，Wager剪切带的最后一次活动要晚于以前的工作推断，当时丘吉尔省西部经历了跨哈德逊造山带西部的终端碰撞事件后的岩石圈分层和挖掘。

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Characterization of the Wager shear zone, Nunavut, Canada: Insights from microstructures and geochronology

The Wager shear zone is an ∼450-km long zone of high strain hosted within Proterozoic and Archean rocks of the Rae domain in northwestern Hudson Bay, Nunavut. New field mapping and microstructural analyzes, combined with titanite and apatite geochronology, define the style, kinematics, and timing of Proterozoic ductile deformation. The results indicate that the Wager shear zone accommodated high-temperature deformation between ca. 1.75 and 1.74 Ga with post-kinematic cooling through apatite U–Pb closure (425–530 °C) at ca. 1705 Ma. These new data show that the Wager shear zone was last active later than inferred in previous work, at a time when the western Churchill Province was undergoing lithospheric delamination and exhumation following the terminal collisional events in the western portion of the Trans-Hudson Orogen.

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来源期刊

Canadian Journal of Earth Sciences 地学-地球科学综合

CiteScore

2.80

自引率

7.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Canadian Journal of Earth Sciences reports current research in climate and environmental geoscience; geoarchaeology and forensic geoscience; geochronology and geochemistry; geophysics; GIS and geomatics; hydrology; mineralogy and petrology; mining and engineering geology; ore deposits and economic geology; paleontology, petroleum geology and basin analysis; physical geography and Quaternary geoscience; planetary geoscience; sedimentology and stratigraphy; soil sciences; and structural geology and tectonics. It also publishes special issues that focus on information and studies about a particular segment of earth sciences.