Evidence for exhumation of a granite intrusion in a regional extensional stress regime based on coupled microstructural and fluid inclusion plane studies – An example from the Velence Mts., Hungary

Benkó, Zsolt; Molnár, Ferenc; Lespinasse, Marc

doi:10.1016/j.jsg.2014.04.001

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…Melt ascent from the zone of partial anatexis to the zone of final emplacement and solidification was favored by the transtensional or extensional tectonic environment along huge and deep strike-slip fault systems (Uher and Broska, 1996;Benk o et al, 2014). Since boron reduces the viscosity of the melt, the presumed boron content of granitic magma may have promoted the melt reaching a shallower depth.…”

Section: Discussionmentioning

confidence: 99%

“…Its rocks also appear as minor subvolcanic bodies in the granite and the contact slate. Fluid flows associated with Paleogene volcanism are limited in space to the Eocene volcanic unit and to the easternmost part of the granitic area (Benk o et al, 2014). The western boundary of the Paleogene fluid flow in granite is shown by a dotted line in Fig.…”

Section: Geologic Settingmentioning

confidence: 99%

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Tourmalines of the Velence Granite Formation and the surrounding contact slate, Velence Mountains, Hungary

Fehér

Zajzon

2021

CEuGeol

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Three distinct paragenetic and compositional types of tourmaline were described from the Velence Granite and the surrounding contact slate. Rare, pitch-black, disseminated tourmaline I (intragranitic tourmaline) occurs in granite, pegmatite, and aplite; very rare, black to greenish-gray, euhedral tourmaline II (miarolitic tourmaline) occurs in miarolitic cavities of the pegmatites; abundant, black to gray, brown to yellow or even colorless, acicular tourmaline III (metasomatic tourmaline) occurs in the contact slate and its quartz-tourmaline veins. Tourmaline from a variety of environments exhibits considerable variation in composition, which is controlled by the nature of the host rock and the formation processes. However, in similar geologic situations, the composition of tourmaline can be rather uniform, even between relatively distant localities. Tourmaline I is represented by an Al-deficient, Fe3+-bearing schorl, which crystallized in a closed melt-aqueous fluid system. Tourmaline II is a schorl-elbaite mixed crystal, which precipitated from Li- and F-enriched solutions in the cavities of pegmatites. Tourmaline III shows an oscillatory zoning; its composition corresponds to schorl, dravite, and foitite species. It formed from metasomatizing fluids derived from the granite. This is the most abundant tourmaline type, which can be found in the contact slate around the granite.

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Section: Discussionmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Tourmalines of the Velence Granite Formation and the surrounding contact slate, Velence Mountains, Hungary

Fehér

Zajzon

2021

CEuGeol

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“…Based on the mineralogical composition, three types of dikes can be identified in the study area: granite porphyry, quartz and monchiquite dikes. The first one, the most abundant in the study area, was formed in the late phase of the granite intrusion, showing slight chemical difference compared to granite (Benkó et al, 2014;Horváth et al, 2004). Quartz dikes are originated by a hydrothermal activity, associated also to the granite formation (Benkó et al, 2014;Horváth et al, 2004) and their age is unknown (Horváth et al, 2004).…”

Section: Study Area For Ambient Gamma Dose Equivalent Rate Evaluationmentioning

confidence: 91%

“…The first one, the most abundant in the study area, was formed in the late phase of the granite intrusion, showing slight chemical difference compared to granite (Benkó et al, 2014;Horváth et al, 2004). Quartz dikes are originated by a hydrothermal activity, associated also to the granite formation (Benkó et al, 2014;Horváth et al, 2004) and their age is unknown (Horváth et al, 2004). Monchiquite dikes crystallized from a volatile rich mafic melt in the late Cretaceous (Horváth et al, 2004) (Figure 6).…”

Section: Study Area For Ambient Gamma Dose Equivalent Rate Evaluationmentioning

confidence: 91%

Environmental factors influencing the spatial distribution of geogenic radon sources (uranium, radium) in a granitic area

Beltran¹

2019

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During this journey far from home, I was so blessed to meet such incredible people with a warm hearth who helped me during the hardest time, to whom I am sincerely thankful.I will be always thankful to Mauricio Moreno-Zambrano for his endless support, help, patience and for being my strength in the hardest period, thanks my love for everything.Although, the words will never be enough, I would like to thank to my mother Gladys Torres for all she has done for me, for all her kindness, infinite love, for always encouraging me to reach my goals. Finally, a big thanks for the support of my beloved nieces Nathaly, Stephanie and Romy whom are always my inspiration. v vi

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“…The repeated pre-orogenic extension prior to Cretaceous folding was postulated based on abrupt facies changes of the Triassic and the Jurassic formations (Galácz and Vörös, 1972;Galácz, 1988;Budai and Vörös, 1992, 1993Haas, 1993;Csillag et al, 1995;Vörös and Galácz, 1998;Budai et al, 2001). Generation of joints and fractures combined with fluid flow were connected to this extension, which resulted in veinformation (Benkó et al, 2014;Molnár et al, 2021). However, pre-orogenic syn-sedimentary faults were rarely observed and measured directly, and the observations mainly depict the Jurassic structures (Lantos, 1997;Fodor 2008;Fodor et al, 2013b).…”

Section: Central European Geologymentioning

confidence: 99%

Complex deformation history of the Keszthely Hills, Transdanubian Range, Hungary

Héja

Fodor

Csillag

et al. 2022

CEuGeol

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We have investigated the deformation history of the Keszthely Hills (Transdanubian Range, W Hungary), which belongs to the uppermost slice of the Austroalpine nappe system. This Upper Triassic to Upper Miocene sedimentary rock sequence documented the deformation of the upper crust during repeated rifting and inversion events. We investigated the structural pattern and stress field evolution of this multistage deformation history by structural data collection and evaluation from surface outcrops. Regarding the Mesozoic deformations, we present additional arguments for pre-orogenic (Triassic and Jurassic) extension (D1 and D2 phases), which is mainly characterized by NE–SW extensional structures, such as syn-sedimentary faults, slump-folds, and pre-tilt conjugate normal fault pairs. NW–SE-striking map-scale normal faults were also connected to these phases. The inversion of these pre-orogenic structures took place during the middle part of the Cretaceous; however, minor contractional deformation possibly reoccurred until the Early Miocene (D3 to D5 phases). The related meso- and map-scale structures are gentle to open folds, thrusts and strike-slip faults. We measured various orientations, which were classified into three stress states or fields on the basis of structural criteria, such as tilt-test, and/or superimposed striae on the same fault planes. For this multi-directional shortening we presented three different scenarios. Our preferred suggestion would be the oblique inversion of pre-orogenic faults, which highly influenced the orientation of compressional structures, and resulted in an inhomogeneous stress field with local stress states in the vicinity of inherited older structures. The measured post-orogenic extensional structures are related to a new extensional event, the opening of the Pannonian Basin during the Miocene. We classified these structures into the following groups: immediate pre-rift phase with NE–SW extension (D6), syn-rift phase with E–W extension (D7a) and N–S transpression (D7b), and post-rift phase with NNW–SSE extension (D8).

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Evidence for exhumation of a granite intrusion in a regional extensional stress regime based on coupled microstructural and fluid inclusion plane studies – An example from the Velence Mts., Hungary

Cited by 10 publications

References 21 publications

Tourmalines of the Velence Granite Formation and the surrounding contact slate, Velence Mountains, Hungary

Tourmalines of the Velence Granite Formation and the surrounding contact slate, Velence Mountains, Hungary

Environmental factors influencing the spatial distribution of geogenic radon sources (uranium, radium) in a granitic area

Complex deformation history of the Keszthely Hills, Transdanubian Range, Hungary

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