Boudinage arrangement tracking of hydrothermal veins in the shear zone: example from the argentiferous Strieborna vein (Western Carpathians)

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
S. Jacko, R. Farkašovský, J. Kondela, T. Mikuš, B. Ščerbáková, D. Dirnerová
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引用次数: 3

Abstract

Argentiferous Strieborna vein of the Rožňava ore field occurs at the southwestern margin of the Gemeric Unit (Slovakia). The hydrothermal mineralization of the vein closely related to the Early Cretaceous tectonometamorphic shortening of the Western Carpathians. For their emplacement, the vein used the steeply dipping, fan-like cleavage and dislocation set of the Alpine regional structure. Successively the vein was integrated into the sinistral transpressional regime of the Transgemeric shear zone. A polyphase vein filling comprises Variscan metasomatic siderite remnants and the Early Cretaceous syntectonic hydrothermal mineralization, the latter consisting of two mineralization phases, quartz–siderite and quartz–sulphidic. During Cretaceous shear zone transpressional events, the vein was segmented into five individual bodies and redistributed to kinematically and geometrically different tensional and compressional boudins. The vein asymmetry increase, different vertical mineralization content and spatial distribution of mineral phases representing individual mineralization periods directly relate to a rheological contrast between the vein and surrounding rocks stress and pressure shadows distribution. The actual form and distribution of the Strieborna vein segments is the product of four boudin evolution stages: (1) pre-deformation, (2) initial, (3) boudin-forming and (4) boudin-differentiation stage that controlled vertical mineralization distribution. The sulphidic mineralization is dominated by two generations of argentiferous tetrahedrite and two youngest sulphosalts associations enriched by Sb and Bi. The youngest sulphosalts of the stibnite phase at the Strieborna vein resemble contemporaneous mineral associations at the nearby Čučma stibnite vein lode. Both vein occurrences located within the Transgemeric shear zone belong to the Rožňava ore field and they are cut by the same diagonal strike-slip fault. These analogies indicate a similar genesis of terminal associations at both these vein deposits. Results of the Strieborna vein sulphosalts spatial analysis confirm their vertical zonation. The Sb and Ag contents decrease, while Bi contents increase, with depth and conserve boudin evolution stages created in distinct rheological environments. The vertical boudin arrangement concentrates economically most prospective parts into asymmetric boudin tension shadows.
剪切带热液脉的边界排列追踪——以西喀尔巴阡山脉银质Strieborna脉为例
Rožńava矿田的含银Strieborna矿脉产于Gemeric单元(斯洛伐克)的西南边缘。该矿脉的热液成矿作用与喀尔巴阡山脉西部早白垩世构造变形缩短密切相关。对于它们的侵位,矿脉使用了阿尔卑斯地区结构的陡倾扇形解理和位错组。随后,该矿脉被整合到造山剪切带的左旋挤压机制中。多相矿脉充填包括华力西交代菱铁矿残余和早白垩世同构造热液成矿,后者由石英-菱铁矿和石英-硫化物两个矿化相组成。在白垩纪剪切带转换挤压事件中,矿脉被分割成五个单独的岩体,并重新分布为运动学和几何上不同的张性和挤压性布丁。矿脉不对称性的增加、不同的垂直矿化含量以及代表单个矿化期的矿相的空间分布,与矿脉与围岩应力和压力阴影分布之间的流变对比直接相关。Strieborna脉段的实际形态和分布是四个boudin演化阶段的产物:(1)预变形,(2)初始,(3)boudin形成和(4)控制垂直矿化分布的boudin分化阶段。硫化物矿化主要由两代含银四面体和两个最年轻的富含Sb和Bi的硫化物组合组成。Strieborna矿脉辉锑矿相最年轻的硫化物类似于附近Čučma辉锑矿矿脉的同期矿物组合。位于Transgemeric剪切带内的两个矿脉产状都属于Rožńava矿田,它们被同一条对角线走滑断层切割。这些类比表明,在这两个矿脉矿床中,末端缔合物的成因相似。Strieborna静脉硫酸盐的空间分析结果证实了它们的垂直分带性。随着深度的增加,Sb和Ag的含量降低,而Bi的含量增加,并在不同的流变环境中形成了保存的布丁演化阶段。垂直布丁排列将经济上最有前景的部分集中在不对称布丁张力阴影中。
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来源期刊
Journal of Geosciences
Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-MINERALOGY
CiteScore
2.30
自引率
7.10%
发文量
15
审稿时长
>12 weeks
期刊介绍: The Journal of Geosciences is an international peer-reviewed journal published by the Czech Geological Society with support from the Czech Geological Survey. It accepts high-quality original research or review papers dealing with all aspects of the nature and origin of igneous and metamorphic rocks. The Journal focuses, mainly but not exclusively, on: -Process-oriented regional studies of igneous and metamorphic complexes- Research in structural geology and tectonics- Igneous and metamorphic petrology- Mineral chemistry and mineralogy- Major- and trace-element geochemistry, isotope geochemistry- Dating igneous activity and metamorphic events- Experimental petrology and mineralogy- Theoretical models of igneous and metamorphic processes- Mineralizing processes and mineral deposits. All the papers are written in English, even though they may be accompanied by an additional Czech abstract. Each contribution is a subject to peer review by at least two independent reviewers, typically at least one from abroad. The Journal appears 2 to 4 times a year. Formally it is divided in annual volumes, each of them including 4 issues.
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