Publication details
Geological and geophysical study of basic volcanic bodies. A case study from Říp hill, Czech Republic
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| Year of publication | 2016 |
| Type | Conference abstract |
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| Description | Geophysical and geological studies of basic volcanic bodies with high contrast of density and magnetic susceptibility in comparison with the hosting environment can help to understand internal structure of such bodies. Říp hill, which forms an isolated volcanic pipe emplaced in Cretaceous sediments, has been selected as an ideal object for such study. Říp hill consists of olivine poor nephelinite (Ulrych et al., 1998). Its high density (almost 3,2 g/cm3) and susceptibility (in order of magnitude X*10-2 SI) significantly contrast with the properties of hosting Cretaceous sedimentary rocks (relatively low density and magnetic susceptibility). In spite of its high density, this isolated volcanic body is depicted by a negative anomaly in the generally available maps of Bouguer anomalies. This is the case also for many other Cenozoic volcanic bodies in Bohemian Massif (Polanský, 1980). For that reason we have made new gravity and magnetic susceptibility measurements on the top of the hill and in the surrounding area. In addition, geological mapping and structural measurements were made to clarify the architecture of the volcanic pipe. All these data lead to better understanding of structure and evolution of Cenozoic volcanic bodies in the Bohemian Massif. |