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| Content Provider | Springer Nature Link |
|---|---|
| Author | Schnabl, Petr vák, Jiří K. Cajz, Vladimír Lang, Miloš Balogh, Kadosa Pécskay, Zoltan Chadima, Martin Šlechta, Stanislav Kohout, Tomáš Pruner, Petr Ulrych, Jaromír |
| Copyright Year | 2010 |
| Abstract | This study provides new thermomagnetic and petrographic data on specific basaltic rock association from the broader vicinity of the Loučná-Oberwiesenthal volcanic centre, western Bohemia/Saxony. Two types of volcanic rocks were recognized there: (i) high-Ti types (3.5–5.2 wt% TiO$_{2}$) represented by (mela)nephelinite s.s., and sporadically present (ii) medium-Ti types (2.5–3.5 wt% TiO$_{2}$) of olivine nephelinite, nepheline basanite and phonotephrite compositions. In order to examine the rock-magnetic behaviour, they were studied for their variations in the Curie temperature (T$_{C}$) and field-dependent susceptibility, spinel group minerals, chemistry and petrology.Magnetic susceptibility of ulvöspinel-rich titanomagnetite, as a dominant magnetic carrier, depends on the amplitude of measured magnetic field, whereas pure magnetite is field-independent. Field dependence parameter $^{k}$HD of the studied basaltic rocks ranges from 0.8 to 18.7%, TiO$_{2}$ contents in titanomagnetite range from 12.7 to 20.1 wt.%. TiO$_{2}$ content in titanomagnetite does not correlate with whole-rock TiO$_{2}$ content (2.8 to 5.6 wt.%). The content of substituted titanium in the sublattice of magnetite is also sensitively reflected in the Curie temperature, ranging from 200 to 580°C. The spinel group minerals are designated as titanomagnetite with the dominance of ulvöspinel, magnetite and magnesioferrite components, or titanomagnetite with the magnetite, ulvöspinel and magnesioferrite components. Only two samples are characterized by a significant presence of Cr-spinel and magnesiochromite components forming cores of titanomagnetites.The titanomagnetite-bearing rocks in the studied area, likewise the low- to medium-Ti basaltic rocks from the České středohoří Mts., provide similar thermomagnetic curves. |
| Starting Page | 77 |
| Ending Page | 94 |
| Page Count | 18 |
| File Format | |
| ISSN | 00393169 |
| Journal | Studia Geophysica et Geodaetica |
| Volume Number | 54 |
| Issue Number | 1 |
| e-ISSN | 15731626 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2010-03-17 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | high-Ti and medium-Ti basaltic rocks magnetic carriers thermomagnetic experiments Curie temperature variation field-dependent susceptibility Krušné hory/Erzgebirge Mts. Ohře/Eger Rift Meteorology/Climatology Structural Geology Geophysics/Geodesy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Geochemistry and Petrology Geophysics |
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