Orogenic collapse recorded in Benešov granodiorite, Bohemian
Massif

a 2018

Orogenic collapse recorded in Benešov granodiorite, Bohemian Massif

BÁRTA, Ondřej a Rostislav MELICHAR

Základní údaje

Originální název

Orogenic collapse recorded in Benešov granodiorite, Bohemian Massif

Autoři

BÁRTA, Ondřej a Rostislav MELICHAR

Vydání

Geology, Geophysics & Enviroment, Krakow, Wydawnictwa AGH, 2018, 2299-8004. 2018

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Označené pro přenos do RIV

Organizační jednotka

Přírodovědecká fakulta

ISSN

Klíčová slova česky

Český masiv; AMS; benešovský typ; tektonické pohyby

Klíčová slova anglicky

Bohemian Masiff; AMS; Benešov type; tectonics movements

Příznaky

Mezinárodní význam

Změněno: 30. 5. 2018 20:24, Mgr. Ondřej Bárta, Ph.D.

Anotace

V originále

Magmatic rocks in the NE part of the Central Bohemian Plutonic Complex known as the "Benešov type" were affected by strong deformation during the Variscan orogeny. These rocks are represented especially by amphibole-biotite granodiorites. To determine deformation fabric of the "Benešov type", anisotropy of magnetic susceptibility (AMS) was used. AMS data were compared with similar structures found in the Bohemian Massif. Over 450 samples were collected. Recognized magnetic fabric is more-or-less homogenous through the study area. Magnetic lineation dips to the NW or N at low angles (Fig. 1). Magnetic foliations are less homogeneous but it trends to dip to the W-NW. The most of samples have prolate ellipsoid of AMS. The degree of anisotropy varies from 1.033 to 1.132. Relatively low bulk magnetic susceptibility of measured samples (0.23×10-4 – 4.08×10-4 SI) suggests that the AMS signal is caused by paramagnetic minerals. Microstructural observation confirmed top-to-the north tectonic movement. Equivalent shear zones with similar orientation as well as with similar sense of movement were found in this part of the Bohemian Massif in other units, such as Čertovo břemeno type, Miřetín pluton, Nové Město durbachite among others. Considering lithology, dating and tectonics of the surrounding units, these shear zones might be interpreted as ductile to brittle-ductile detachments originated during gravitational collapse of the Variscan orogenic belt.

Citovat

BÁRTA, Ondřej a Rostislav MELICHAR. Orogenic collapse recorded in Benešov granodiorite, Bohemian Massif. In Geology, Geophysics & Enviroment, Krakow, Wydawnictwa AGH, 2018, 2299-8004. 2018. ISSN 2299-8004.

@proceedings{1419007,
   author = {Bárta, Ondřej and Melichar, Rostislav},
   booktitle = {Geology, Geophysics & Enviroment, Krakow, Wydawnictwa AGH, 2018, 2299-8004.},
   keywords = {Bohemian Masiff; AMS; Benešov type; tectonics movements},
   language = {eng},
   title = {Orogenic collapse recorded in Benešov granodiorite, Bohemian Massif},
   year = {2018}
}

TY  - CONF
ID  - 1419007
AU  - Bárta, Ondřej - Melichar, Rostislav
PY  - 2018
TI  - Orogenic collapse recorded in Benešov granodiorite, Bohemian Massif
KW  - Bohemian Masiff
KW  - AMS
KW  - Benešov type
KW  - tectonics movements
N2  - Magmatic rocks in the NE part of the Central Bohemian Plutonic Complex known as the "Benešov type" were affected by strong deformation during the Variscan orogeny. These rocks are represented especially by amphibole-biotite granodiorites. To determine deformation fabric of the "Benešov type", anisotropy of magnetic susceptibility (AMS) was used. AMS data were compared with similar structures found in the Bohemian Massif. Over 450 samples were collected. Recognized magnetic fabric is more-or-less homogenous through the study area. Magnetic lineation dips to the NW or N at low angles (Fig. 1). Magnetic foliations are less homogeneous but it trends to dip to the W-NW. The most of samples have prolate ellipsoid of AMS. The degree of anisotropy varies from 1.033 to 1.132. Relatively low bulk magnetic susceptibility of measured samples (0.23×10-4 – 4.08×10-4 SI) suggests that the AMS signal is caused by paramagnetic minerals. Microstructural observation confirmed top-to-the north tectonic movement. Equivalent shear zones with similar orientation as well as with similar sense of movement were found in this part of the Bohemian Massif in other units, such as Čertovo břemeno type, Miřetín pluton, Nové Město durbachite among others. Considering lithology, dating and tectonics of the surrounding units, these shear zones might be interpreted as ductile to brittle-ductile detachments originated during gravitational collapse of the Variscan orogenic belt.
ER  -

BÁRTA, Ondřej a Rostislav MELICHAR. Orogenic collapse recorded in Benešov granodiorite, Bohemian Massif. In \textit{Geology, Geophysics \&{} Enviroment, Krakow, Wydawnictwa AGH, 2018, 2299-8004.}. 2018. ISSN~2299-8004.

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