Magnetic fabrics of the NE part of the Central Bohemian
Plutonic Complex

a 2015

Magnetic fabrics of the NE part of the Central Bohemian Plutonic Complex

BÁRTA, Ondřej a Rostislav MELICHAR

Základní údaje

Originální název

Magnetic fabrics of the NE part of the Central Bohemian Plutonic Complex

Název česky

Magnetická stavba severovýchodní části středočeského plutonického komplexu

Autoři

BÁRTA, Ondřej a Rostislav MELICHAR

Vydání

13th Meeting of the Central European Tectonic Studies Group, 2015

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

ISBN

978-80-7075-880-9

Klíčová slova anglicky

AMS; Benešov type; tectonics movements

Změněno: 26. 5. 2015 14:00, Mgr. Ondřej Bárta, Ph.D.

Anotace

V originále

The study is focused on the NE margin of the Central Bohemian Plutonic Complex, Bohemian Massif, Czech Republic. Plutonic rocks from this area are known as “Benešov type” and they are usually represented by amphibole-biotite granodiorites. Over 350 samples were taken using a portable drill at 26 sampling sites covering almost all study area. AMS (Anisotropy of magnetic susceptibility) data were used to characterize the magnetic fabric. These results were compared with mesoscopic structural observations and, at some sites, also with microstructures. The AMS method showed several different magnetic fabrics and variations in the shapes of the AMS ellipsoid and the magnetic fabric intensity in the area. The degree of anisotropy varies from 1,033 to 1,132. The shape parameter T varies from medium prolate (-0,483) to strongly oblate (0,777). Most of samples have prolate ellipsoid of deformation. The value of shape parameter increases from east to west. Relatively low bulk magnetic susceptibility of measured samples (0,67x10-4SI – 4,08x10-4SI) suggests that the AMS signal is caused by paramagnetic minerals. Magnetic fabrics (Figure 1) are usually homogenously oriented through the Benešov type. Magnetic lineations dip to the NW or N at low angels. Most of magnetic foliations dip to the W. AMS fabric in the Benešov type can be interpreted as deformation fabric of orogenic collapse.

Citovat

BÁRTA, Ondřej a Rostislav MELICHAR. Magnetic fabrics of the NE part of the Central Bohemian Plutonic Complex. In 13th Meeting of the Central European Tectonic Studies Group. 2015. ISBN 978-80-7075-880-9.

@proceedings{1300033,
   author = {Bárta, Ondřej and Melichar, Rostislav},
   booktitle = {13th Meeting of the Central European Tectonic Studies Group},
   keywords = {AMS; Benešov type; tectonics movements},
   language = {eng},
   isbn = {978-80-7075-880-9},
   title = {Magnetic fabrics of the NE part of the Central Bohemian Plutonic Complex},
   year = {2015}
}

TY  - CONF
ID  - 1300033
AU  - Bárta, Ondřej - Melichar, Rostislav
PY  - 2015
TI  - Magnetic fabrics of the NE part of the Central Bohemian Plutonic Complex
SN  - 9788070758809
KW  - AMS
KW  - Benešov type
KW  - tectonics movements
N2  - The study is focused on the NE margin of the Central Bohemian Plutonic Complex, Bohemian Massif, Czech Republic. Plutonic rocks from this area are known as “Benešov type” and they are usually represented by amphibole-biotite granodiorites. Over 350 samples were taken using a portable drill at 26 sampling sites covering almost all study area. AMS (Anisotropy of magnetic susceptibility) data were used to characterize the magnetic fabric. These results were compared with mesoscopic structural observations and, at some sites, also with microstructures. The AMS method showed several different magnetic fabrics and variations in the shapes of the AMS ellipsoid and the magnetic fabric intensity in the area. The degree of anisotropy varies from 1,033 to 1,132. The shape parameter T varies from medium prolate (-0,483) to strongly oblate (0,777). Most of samples have prolate ellipsoid of deformation. The value of shape parameter increases from east to west. Relatively low bulk magnetic susceptibility of measured samples (0,67x10-4SI – 4,08x10-4SI) suggests that the AMS signal is caused by paramagnetic minerals. Magnetic fabrics (Figure 1) are usually homogenously oriented through the Benešov type. Magnetic lineations dip to the NW or N at low angels. Most of magnetic foliations dip to the W. AMS fabric in the Benešov type can be interpreted as deformation fabric of orogenic collapse.
ER  -

BÁRTA, Ondřej a Rostislav MELICHAR. Magnetic fabrics of the NE part of the Central Bohemian Plutonic Complex. In \textit{13th Meeting of the Central European Tectonic Studies Group}. 2015. ISBN~978-80-7075-880-9.

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