加拿大萨斯喀彻温省阿萨巴斯卡盆地西南部帕特森湖走廊的构造演化及其对铀矿化的相关影响

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2020-11-12 DOI:10.1144/geochem2020-030

D. Johnstone, K. Bethune, C. Card, V. Tschirhart

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引用次数: 9

摘要

帕特森湖走廊位于阿萨巴斯卡盆地西南边缘，包含几个基底铀矿床和远景。本研究期间的岩芯调查已确定，花岗岩、花岗闪长岩、镁铁质和碱性侵入基岩夹在深部NE走向的近垂直非均质高应变带中，该带由网状韧性至半脆性剪切带和脆性断层定义。韧性变形的最早阶段（D1/D2），与Taltson（1.94–1.92 Ga）造山作用，涉及早期褶皱组（F1/F2）和相关韧性换位叶理（S1/S2）的发育之间的干扰。在随后的雪鸟时期（约1.91–1.90 Ga）构造作用，该复合叶理被NE向褶皱式褶皱（F3）重新折叠（D3），包括以克利尔沃特气磁高压为中心的区域褶皱。在与D3的连续体中，具有C–S几何结构的右旋反绿泥质石墨剪切网络最初形成（D4a），并发展为更离散、间隔更大的半脆性结构（D4b；C.1.900–1.819 Ga）。盆地开发（D5a；本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Structural evolution and related implications for uranium mineralization in the Patterson Lake corridor, southwestern Athabasca Basin, Saskatchewan, Canada

The Patterson Lake corridor is situated along the SW margin of the Athabasca Basin and contains several basement-hosted uranium deposits and prospects. Drill core investigations during this study have determined that granite, granodiorite, mafic and alkali intrusive basement rocks are entrained in a deep-seated NE-striking subvertical heterogeneous high-strain zone defined by anastomosing ductile to semi-brittle shears and brittle faults. The earliest phases of ductile deformation (D1/D2), linked with Taltson (1.94–1.92 Ga) orogenesis, involved interference between early fold sets (F1/F2) and development of an associated ductile transposition foliation (S1/S2). During subsequent Snowbird (c. 1.91–1.90 Ga) tectonism, this composite foliation was re-folded (D3) by NE-trending buckle-style folds (F3), including a regional fold centred on the Clearwater aeromagnetic high. In continuum with D3, a network of dextral-reverse chloritic-graphitic shears, with C–S geometry, formed initially (D4a) and progressed to more discrete, spaced semi-brittle structures (D4b; c. 1.900–1.819 Ga). Basin development (D5a;

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来源期刊

Geochemistry-Exploration Environment Analysis 地学-地球化学与地球物理

CiteScore

3.60

自引率

16.70%

发文量

审稿时长

1 months

期刊介绍： Geochemistry: Exploration, Environment, Analysis (GEEA) is a co-owned journal of the Geological Society of London and the Association of Applied Geochemists (AAG). GEEA focuses on mineral exploration using geochemistry; related fields also covered include geoanalysis, the development of methods and techniques used to analyse geochemical materials such as rocks, soils, sediments, waters and vegetation, and environmental issues associated with mining and source apportionment. GEEA is well-known for its thematic sets on hot topics and regularly publishes papers from the biennial International Applied Geochemistry Symposium (IAGS). Papers that seek to integrate geological, geochemical and geophysical methods of exploration are particularly welcome, as are those that concern geochemical mapping and those that comprise case histories. Given the many links between exploration and environmental geochemistry, the journal encourages the exchange of concepts and data; in particular, to differentiate various sources of elements. GEEA publishes research articles; discussion papers; book reviews; editorial content and thematic sets.