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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Magnetic fabric and petrology of Miocene sub-volcanic sills and dykes emplaced into the SW Flysch Belt of the West Carpathians (S Moravia, Czech Republic) and their volcanological and tectonic implications
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Magnetic fabric and petrology of Miocene sub-volcanic sills and dykes emplaced into the SW Flysch Belt of the West Carpathians (S Moravia, Czech Republic) and their volcanological and tectonic implications

机译：中新世次火山基岩和堤防的磁性结构和岩石学，并置于西喀尔巴阡山脉的西南弗里希带（捷克摩拉维亚），及其火山学和构造意义

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Magnetic fabrics were investigated in the sub-volcanic bodies occurring within the SW Flysch Belt of the Western Carpathians. Magnetite or low-Ti titanomagnetite is the principal carrier of the anisotropy of magnetic susceptibility (AMS) in these rocks, though various Fe-Ti oxides were also identified in minor amounts. The magnetic fabric in almost all sills and dykes is conformable to the shapes of the bodies and no doubt originated through more or less free magma flow that requires relatively open voids to be injected, that likely originated in an extensive tectonic regime. In an ankaramite sill, where the rock creates typical hexagonal columns, the magnetic fabric is related rather to the column axes than to the overall shape of the sill. The magnetic fabric formation in this sill is controlled by the post-emplacement process of the creation of the columns. At some studied localities, signs of post-magmatic Middle Miocene tectonic deformation are observed in the field, the youngest known in the Flysch Belt As the magnetic fabric is unrelated to those signs, we conclude that these young tectonic movements did not penetrate ductilely in the volume of the volcanic body. It seems that the strain was focused to thin zones along the faults, since it did not change the preferred orientation of magnetic minerals in the rock volume substantially.
机译：研究了西喀尔巴阡山脉西南部的弗利希带内次火山体中的磁性织物。磁铁矿或低钛钛磁铁矿是这些岩石中磁化率各向异性（AMS）的主要载体，尽管也发现了少量的各种Fe-Ti氧化物。几乎所有的窗台和堤坝中的磁性织物都符合人体的形状，并且无疑是由或多或少的自由岩浆流引起的，该岩浆流需要注入相对开放的空隙，这很可能起源于广泛的构造机制。在一个形成岩石的典型六方柱状的Ankaramite窗台中，磁性纤维与柱轴有关，而不与窗台的整体形状有关。该窗台上磁性织物的形成是由放置柱子的后置过程控制的。在一些研究的地方，在田野中观察到了岩浆后中新世构造变形的迹象，这是在Flysch带中已知的最年轻的时期。由于磁性构造与那些迹象无关，我们得出结论，这些年轻的构造运动并没有在韧性地渗透。火山体的体积。似乎该应变集中在沿断层的薄带上，因为它并没有实质性地改变岩石体积中磁性矿物的首选取向。

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