华力西应力状态旋转:对波兰南部波希米亚地块北缘扭结褶皱的分析

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Comptes Rendus Geoscience Pub Date : 2019-06-01 DOI:10.1016/j.crte.2019.04.003
Jerzy Żaba, Krzysztof Gaidzik
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引用次数: 2

摘要

我们的目的是确定波希米亚地块北部最年轻的瓦里斯坎变形期间应力状态的变化。为此,我们采用两种方法计算了Karkonosze花岗岩变质包壳中观察到的扭结褶皱的主应力和应变轴方向:1)传统方法,结合结构图(仅适用于共轭扭结褶皱),2)蝴蝶图分析。这两种方法的使用使我们能够确定应力状态,不仅基于共轭,而且基于单斜扭结带。所得结果证明,当蝴蝶图分析应用于单斜扭结褶皱时,得到了可靠的结果,特别是当使用共轭结构计算的内摩擦角(Ф)进行校准时。确定了两代扭折褶皱:1)较老的扭折褶皱发育于次基底缩短时期,很可能与变质单元向西逆冲的早石炭世末期有关;2)较年轻的扭折褶皱;由南北向瓦里斯坎石炭纪挤压作用和Karkonosze花岗岩的侵位和后来的圆顶作用形成。这是第一次对波西米亚地块变质单元中常见的脆性-韧性构造进行研究,显示了它们与花岗岩类侵入的关系,并补充了通常忽略扭折褶皱的构造模型。
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Variscan stress regime rotation: Insights from the analysis of kink folds in the northern margin of the Bohemian Massif, South Poland

We aimed to determine variations in stress regimes during the youngest Variscan deformations in the northern part of the Bohemian Massif. For this purpose, we calculated the orientation of the principal stress and strain axes for kink folds observed in the metamorphic envelope of the Karkonosze Granite, using two methods: 1) the traditional method, incorporating structural diagrams (for conjugate kink folds only), and 2) butterfly diagram analysis. The use of both methods enabled us to determine the stress regime, based not only on conjugate but also on monoclinal kink bands. The obtained results prove that butterfly diagram analysis, when applied to monoclinal kink folds, yields reliable results, especially when calibrated using the internal friction angle (Ф) calculated for the conjugate structures.

We identified two generations of kink folds: 1) an older one, developed under sublatitudinal shortening and most probably related to the Early Carboniferous terminal stages of the northwest-directed thrusting of the metamorphic units, and 2) a younger one; produced by north-south Variscan Carboniferous compression, and the emplacement and subsequent doming of the Karkonosze Granite. This is the first study on brittle-ductile structures observed commonly in the metamorphic units of the Bohemian Massif, showing their relation to the granitoid intrusion and complementing the tectonic models that usually omit kink folds.

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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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