Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine
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| Veröffentlicht in: | Геофизический журнал |
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| Datum: | 2010 |
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Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine / M. Jelenska, M. Kadzialko-Hofmokl, V. Bakhmutov, I. Poliachenko, P. Ziolkowski // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 59-60. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859636672913735680 |
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| author | Jelenska, M. Kadzialko-Hofmokl, M. Bakhmutov, V. Poliachenko, I. Ziolkowski, P. |
| author_facet | Jelenska, M. Kadzialko-Hofmokl, M. Bakhmutov, V. Poliachenko, I. Ziolkowski, P. |
| citation_txt | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine / M. Jelenska, M. Kadzialko-Hofmokl, V. Bakhmutov, I. Poliachenko, P. Ziolkowski // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 59-60. — англ. |
| collection | DSpace DC |
| container_title | Геофизический журнал |
| first_indexed | 2025-12-07T13:16:59Z |
| format | Article |
| fulltext |
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Identification of magnetic carriers of original and secondary
NRM components recorded in Devonian sediments from
Podolia, SW Ukraine
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1, V. Bakhmutov2, I. Poliachenko2
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3, 2010
1Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland
bogna@igf.edu.pl
2Institute of Geophysics, National Academy of Sciences of Ukraine, Kiev, Ukraine
bakhm@igph.kiev.ua
3Faculty of Geology, University of Warsaw, Poland
made for a whole rock gave Tb characteristic for
hematite, but the presence of other minerals was
not observed, especially mineral of Tb 600 C was
not seen. Heating to 700 C did not change com-
position of magnetic minerals. Thermomagnetic
analysis made for the strongest component of NRM
is similar to its thermal demagnetization — the main
carrier of NRM is mineral with Tb 600 C. Intensity
of NRM is about 1 % of SIRM intensity. It means
that the main magnetic mineral observed on SIRM(T)
curves — hematite — did not record any stable
paleomagnetic direction. Comparison of hysteresis
parameters of rock and AF demagnetization curves
of NRM revealed that the magnetic grains which are
the carriers of the main component of natural rema-
nence are as hard as the grains of main mineral.
Although their Tb is close to Tb of magnetite
( 600 C) very high coercivity and remanence co-
ercivity exclude magnetite or maghemite. The alter-
native is hematite with small content of titanium.
Proper identification of this mineral has crucial sig-
nificance for interpretation of NRM components.
Regarding primary Devonian component found in
some samples at the end of demagnetization curves
we believe that it was recorded in small amount of
hematite grains possibly of different origin then
majority of hematite being the source of SIRM.
Petrologic studies based on scanning electron
microscopy (SEM), wavelength dispersive spectro-
scopy (WDS) and X-ray diffraction (XRD) analysis re-
vealed the presence of three main magnetic carriers:
1) detritic grains of hematite with small content
of Ti — up to 3 % (size up to 100 μm),
2) authigenic, pure hematite crystals (1—2 μm
size) occurring in the ferruginous cement of
sandstones,
Palaeozoic sediments are widespread in the west
and southwest of the East-European platform. They
are presented by carbonate-terrigenous rocks which
thicknesses are increases westwards. The atten-
tion of geologists and paleontologists has been at-
tracted for a long time to the Silurian — Lover Devo-
nian sedimentary rocks because of quality of their
exposure on the high and steep slopes of rivers and
valleys, almost horizontal position, weak metamor-
phism and the abundance and breadth of fossils.
Most of paleomagnetic poles of Silurian and
Devonian age published for the Russian Platform
are coincident with the Late Palaeozoic part of the
APWP. So, there is a suspicion that these poles
are not well dated or are based on secondary mag-
netization. The Silurian-Devonian part of APWR is
based mainly on extrapolation between best quali-
ty poles. Although apparently well defined, the Si-
lurian-Devonian part lying close to the Carbonife-
rous segment of the APWP needs verification by
new reliable data, and the main problem is identifi-
cation of magnetic carriers of NRN components re-
corded in Devonian red sediments.
New Paleomagnetic study of Devonian ferrugi-
nous sandstones and siltstones from Podolia re-
vealed that the main direction was recorded during
remagnetization in Permo — Carboniferous time.
Thermal demagnetization of Natural Remanent Mag-
netization (NRM) showed that this component was
carried by mineral with blocking temperature (Tb)
about 600 C. In several samples, at the end of
demagnetization curves, besides this main compo-
nent, we isolated Devonian direction with Tb close
to the value of hematite (670—690 C).
Thermomagnetic analysis giving decay curves
of saturation remanence during heating SIRM(T)
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3) unidentified (Ti-hematite?) iron oxide, formed
within the disintegrating detritic chlorite and
biotite grains.
The detrital hematite (with small content of Ti) is
a primary magnetic mineral contained inside the
rock. This is a good candidate for being a carrier of
the Devonian component of NRM. Unidentified iron
oxides (Ti-hematite?) can be responsible for the
Permo-Carboniferous remagnetization. Authigenic,
pure hematite crystals (1—2 μm size) occurring in
the ferruginous cement of sandstones are the main
source of SIRM but majority of grains does not car-
ry any stable component of NRM.
|
| id | nasplib_isofts_kiev_ua-123456789-101390 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0203-3100 |
| language | English |
| last_indexed | 2025-12-07T13:16:59Z |
| publishDate | 2010 |
| publisher | Інститут геофізики ім. С.I. Субботіна НАН України |
| record_format | dspace |
| spelling | Jelenska, M. Kadzialko-Hofmokl, M. Bakhmutov, V. Poliachenko, I. Ziolkowski, P. 2016-06-03T09:07:22Z 2016-06-03T09:07:22Z 2010 Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine / M. Jelenska, M. Kadzialko-Hofmokl, V. Bakhmutov, I. Poliachenko, P. Ziolkowski // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 59-60. — англ. 0203-3100 https://nasplib.isofts.kiev.ua/handle/123456789/101390 en Інститут геофізики ім. С.I. Субботіна НАН України Геофизический журнал Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine Article published earlier |
| spellingShingle | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine Jelenska, M. Kadzialko-Hofmokl, M. Bakhmutov, V. Poliachenko, I. Ziolkowski, P. |
| title | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine |
| title_full | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine |
| title_fullStr | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine |
| title_full_unstemmed | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine |
| title_short | Identification of magnetic carriers of original and secondary NRM components recorded in Devonian sediments from Podolia, SW Ukraine |
| title_sort | identification of magnetic carriers of original and secondary nrm components recorded in devonian sediments from podolia, sw ukraine |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/101390 |
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