Bottom to top lithosphere structure and evolution of western Eger Rift (Central Europe)

Babuška, Vladislav; Fiala, Jiřı́; Plomerová, Jaroslava

doi:10.1007/s00531-009-0434-4

Cited by 31 publications

(19 citation statements)

References 83 publications

(106 reference statements)

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“…Alternative model is presented by Babuška and coworkers (e.g. Babuška et al 2010;Babuška and Plomerová 2006) who argue that no delamination took place during the development of the Variscan Orogen. This model would imply more mafic lower crust, consisting of mafic granulites.…”

Section: The Crustal Structure Beneath the Niedźwiedź Massifmentioning

confidence: 99%

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Lithosphere thermal structure at the eastern margin of the Bohemian Massif: a case petrological and geophysical study of the Niedźwiedź amphibolite massif (SW Poland)

Puziewicz

Czechowski

Krysiński

et al. 2011

Int J Earth Sci (Geol Rundsch)

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The crustal section beneath amphibolite Niedźwiedź Massif (Fore-Sudetic Block in NE Bohemian Massif), modelled on the basis of geological and seismic data, is dominated by gneisses with subordinate granites (upper and middle crust) and melagabbros (lower crust). The geotherm was calculated based on the chemical analyses of the heat-producing elements in the rocks forming the crust and the measurements of their density and heat conductivity. The results were verified by heat flow calculations based on temperature measurements from 1,600 m deep well in the Niedźwiedź Massif and by temperaturedepth estimates in mantle xenoliths coming from the nearby ca. 4.5 My basanite plug in Lutynia. The paleoclimate-corrected heat flow in the Niedźwiedź Massif is 69.5 mW m -2 , and the mantle heat flow is 28 mW m -2 . The mantle beneath the Massif was located marginally relative to the areas of intense Cenozoic thermal rejuvenation connected with alkaline volcanism. This results in geotherm which is representative for lithosphere parts located at the margins of zones of continental alkaline volcanism and at its waning stages. The lithosphereasthenosphere boundary (LAB) beneath Niedźwiedź is located between 90 and 100 km depth and supposedly the rheological change at LAB is not related to the appearance of melt.

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Section: The Crustal Structure Beneath the Niedźwiedź Massifmentioning

confidence: 99%

“…Babuška et al (2010) show the lithosphereasthenosphere boundary (LAB) to be located at ca. 140 km beneath the Moldanubian core of the Bohemian Massif, shallowing to 80 km beneath Ohře Rift (Eger Graben) and to 80-100 beneath Saxothuringian Zone.…”

Section: The Depth Of Asthenospherementioning

confidence: 99%

Lithosphere thermal structure at the eastern margin of the Bohemian Massif: a case petrological and geophysical study of the Niedźwiedź amphibolite massif (SW Poland)

Puziewicz

Czechowski

Krysiński

et al. 2011

Int J Earth Sci (Geol Rundsch)

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“…However, the crystalline basement of the western ER belongs to the ST unit (Tomek et al 1997;Mlčoch 2003;Mlčoch and Konopásek 2010), which is in allochtonous position above this mantle transition. It is generally accepted that after a complete subduction of the ST oceanic lithosphere, the process continued by a continental collision accompanied by subduction and a subsequent exhumation at the north-western margin of the TB unit (Babuška et al 2010). The MLC and its equivalent beneath the Doupovské hory Mts.…”

Section: Mantle Control Of the Saxothuringianteplá-barrandian Microplmentioning

confidence: 99%

“…6). Babuška et al (2010) suggested that this is because the graben has developed above the mantle suture between the ST and TB units, while the CHB position was predestined by the crustal and lithosphere thinning above the "triple junction" of the ST/TB/MD mantle lithospheres. The NNW striking WBSZ, as a deep boundary between the TB and MD mantle lithospheres in the western BM , and the sub-parallel MLF probably played a very important role in the CHB development.…”

Section: Deep-seated Predisposition Of Sedimentary Basinsmentioning

confidence: 99%

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

Babuška¹,

Plomerová²

2012

J. Geosci.

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This paper summarizes our recent research on the relationship between tectonics of the mantle lithosphere and of the upper crust in the western Bohemian Massif. The rejuvenated Variscan junction of three mantle domains, the Saxothuringian, Moldanubian and Teplá-Barrandian, delimited by different orientation of seismic anisotropy reflecting a consistent fossil olivine orientation and belonging to originally separated microplates, plays important role in the crustal architecture of the region. The crust above the mantle junction is the most active part of the BM characterized by periodic earthquake swarms and mofettes emitting gases of mantle origin. Detected offsets of surface boundaries of the three units from their mantle counterparts indicate a detachment of the rigid upper crust from the mantle lithosphere. Locations of major tectonic features like the Ohře (Eger) Rift, the West Bohemian Shear Zone and the Mariánské Lázně Fault were probably predisposed by the boundaries of the mantle lithosphere domains. We have suggested that the sublithospheric mantle of the western BM acted as a major provider for heat and partial melts and the Variscan mantle boundaries served as magma conduits for the late-orogenic granitic magmatism and, after their rejuvenation, also for the Cenozoic volcanism. Similarly, the boundaries may have pre-determined the subsequent locations of sedimentary basins. It is possible that also in other regions some of these so called intra-plate phenomena can be related to partly healed up and later rejuvenated microplate boundaries.

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“…The Eger Graben runs across the north-western part of the Bohemian Massif in the ENE-WSW direction (Fig. 2), roughly following the Variscan suture between the Saxothuringian and Teplá-Barrandian domains of the Bohemian Massif (Babuška et al, 2010;Mlčoch & Konopásek, 2010). It is interpreted as an incipient rift structure formed during two distinct extensional phases (Rajchl et al, 2009 NNE-SSW to N-S oriented horizontal extension, oblique to the rift axis.…”

mentioning

confidence: 99%

Slope Dependent Morphometric Analysis as a Tool Contributing to Reconstruction of Volcano Evolution

Kopačková¹,

Rapprich²,

Šebesta³

et al. 2011

Earth and Environmental Sciences

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IntroductionPeople have been fascinated by volcanoes since time immemorial. This is mainly due to the serious consequences that volcanic eruptions represent for human society. Volcanic activity develops in various ways. Therefore, evolutionary trends and the history of the volcanic system should be well understood when future hazards must be predicted and their impact on human society reduced. A volcano's history can be reconstructed from its deposits, their superposition and spatial relationships. Geological mapping is the crucial method for acquiring this information. Unfortunately, large areas in volcanic zones are inaccessible for research directly in the field. In these areas, the geological setting must be investigated by a combination of remote sensing methods and field observations from accessible outcrops. Surface methods such as remote sensing and morphological analysis provide fast and relatively cheap information, complementary to classical field geology for studying the subsurface geology. These methods can be beneficial, especially for areas with poor accessibility and/or dense vegetation cover. Volcanoes or volcanic complexes quite often represent such areas. Land forms are a result of geologic and geomorphologic processes that occur on the earth's surface thus land forms are not chaotic, but have been structured by geologic and geomorphologic processes over time. The geomorphology of volcanic formations as a whole seems to be a reflection of the underlying geology with steep-sided land forms occurring at each of the "strong" rock units and long, with gentle slopes and topographic breaks found on "soft" rocks. To support this theory, we employed and tested new methodology combining information arising from field surveys together with visual interpretation and statistical spatial analysis of morphometric slope-depending classes to define the spatial extent of various volcanic formations and to identify major tectonic phenomena from features derived from the geomorphology in more accurate way. Study areasMorphometric analysis was applied to two case study areas, two volcanic complexes of distinct geotectonic setting, age and volcanic evolution. Selected volcanic areas encompass a www.intechopen.com Earth and Environmental Sciences 220 number of features and rock types associated with volcanic activity. The first case study was carried out in the Conchagua Volcanic Complex, El Salvador (Central America), while the second one was performed in the Doupovské hory Volcanic Complex, Czech Republic (Central Europe). Conchagua VolcanoThe Pacific coast of Central America is bordered by a chain of active subduction-related volcanoes. This chain is called the Central American Volcanic Arc (CAVA) and extends from Guatemala via El Salvador, southern Honduras, Nicaragua and Costa Rica to western Panama (e.g., Carr et al., 2003). The volcanic arc is associated with the subduction of the Cocos plate beneath the Caribbean plate and it is divided into several segments by traverse faults. Conchagua Volcano is located ...

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Bottom to top lithosphere structure and evolution of western Eger Rift (Central Europe)

Cited by 31 publications

References 83 publications

Lithosphere thermal structure at the eastern margin of the Bohemian Massif: a case petrological and geophysical study of the Niedźwiedź amphibolite massif (SW Poland)

Lithosphere thermal structure at the eastern margin of the Bohemian Massif: a case petrological and geophysical study of the Niedźwiedź amphibolite massif (SW Poland)

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

Slope Dependent Morphometric Analysis as a Tool Contributing to Reconstruction of Volcano Evolution

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