Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1
Abstract Pliocene volcanic rocks from south-east Austria were paleomagnetically investigated. Samples were taken from 28 sites located on eight different volcanoes. Rock magnetic investigations revealed that magnetic carriers are Ti-rich or Ti-poor titanomagnetites with mainly pseudo-single-domain c...
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ftdoajarticles:oai:doaj.org/article:a1c1365bdfaa44ad8c26eef4020dbad6 2023-05-15T16:19:38+02:00 Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1 Elisabeth Schnepp Patrick Arneitz Morgan Ganerød Robert Scholger Ingomar Fritz Ramon Egli Roman Leonhardt 2021-10-01T00:00:00Z https://doi.org/10.1186/s40623-021-01518-w https://doaj.org/article/a1c1365bdfaa44ad8c26eef4020dbad6 EN eng SpringerOpen https://doi.org/10.1186/s40623-021-01518-w https://doaj.org/toc/1880-5981 doi:10.1186/s40623-021-01518-w 1880-5981 https://doaj.org/article/a1c1365bdfaa44ad8c26eef4020dbad6 Earth, Planets and Space, Vol 73, Iss 1, Pp 1-21 (2021) Paleomagnetism Paleointensity Transitional field configuration Cryptochron C2r.2r-1 39Ar/40Ar dating Styria (Austria) Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1186/s40623-021-01518-w 2022-12-31T11:44:49Z Abstract Pliocene volcanic rocks from south-east Austria were paleomagnetically investigated. Samples were taken from 28 sites located on eight different volcanoes. Rock magnetic investigations revealed that magnetic carriers are Ti-rich or Ti-poor titanomagnetites with mainly pseudo-single-domain characteristics. Characteristic remanent magnetization directions were obtained from alternating field as well as from thermal demagnetization. Four localities give reversed directions agreeing with the expected direction from secular variation. Another four localities of the Klöch–Königsberg volcanic complex (3) and the Neuhaus volcano (1) have reversed directions with shallow inclinations and declinations of about 240° while the locality Steinberg yields a positive inclination of about 30° and 200° declination. These aberrant directions cannot be explained by local or regional tectonic movements. All virtual geomagnetic pole positions are located on the southern hemisphere. Four virtual geomagnetic poles lie close to the geographic pole, while all others are concentrated in a narrow longitude sector offshore South America (310°–355°) with low virtual geomagnetic pole latitudes ranging from − 15° to − 70°. The hypothesis that a transitional geomagnetic field configuration was recorded during the short volcanic activity of these five localities is supported by 9 paleointensity results and 39Ar/40Ar dating. Virtual geomagnetic dipole moments range from 1.1 to 2.9·1022 Am2 for sites with low VGP latitudes below about 60° and from 3.0 to 9.3·1022 Am2 for sites with higher virtual geomagnetic pole latitudes. The new 39Ar/40Ar ages of 2.51 ± 0.27 Ma for Klöch and 2.39 ± 0.03 Ma for Steinberg allow for the correlation of the Styrian transitional directions with cryptochron C2r.2r-1 of the geomagnetic polarity time scale. Graphic abstract Article in Journal/Newspaper Geomagnetic Pole Directory of Open Access Journals: DOAJ Articles Earth, Planets and Space 73 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Paleomagnetism Paleointensity Transitional field configuration Cryptochron C2r.2r-1 39Ar/40Ar dating Styria (Austria) Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 |
spellingShingle |
Paleomagnetism Paleointensity Transitional field configuration Cryptochron C2r.2r-1 39Ar/40Ar dating Styria (Austria) Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 Elisabeth Schnepp Patrick Arneitz Morgan Ganerød Robert Scholger Ingomar Fritz Ramon Egli Roman Leonhardt Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1 |
topic_facet |
Paleomagnetism Paleointensity Transitional field configuration Cryptochron C2r.2r-1 39Ar/40Ar dating Styria (Austria) Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 |
description |
Abstract Pliocene volcanic rocks from south-east Austria were paleomagnetically investigated. Samples were taken from 28 sites located on eight different volcanoes. Rock magnetic investigations revealed that magnetic carriers are Ti-rich or Ti-poor titanomagnetites with mainly pseudo-single-domain characteristics. Characteristic remanent magnetization directions were obtained from alternating field as well as from thermal demagnetization. Four localities give reversed directions agreeing with the expected direction from secular variation. Another four localities of the Klöch–Königsberg volcanic complex (3) and the Neuhaus volcano (1) have reversed directions with shallow inclinations and declinations of about 240° while the locality Steinberg yields a positive inclination of about 30° and 200° declination. These aberrant directions cannot be explained by local or regional tectonic movements. All virtual geomagnetic pole positions are located on the southern hemisphere. Four virtual geomagnetic poles lie close to the geographic pole, while all others are concentrated in a narrow longitude sector offshore South America (310°–355°) with low virtual geomagnetic pole latitudes ranging from − 15° to − 70°. The hypothesis that a transitional geomagnetic field configuration was recorded during the short volcanic activity of these five localities is supported by 9 paleointensity results and 39Ar/40Ar dating. Virtual geomagnetic dipole moments range from 1.1 to 2.9·1022 Am2 for sites with low VGP latitudes below about 60° and from 3.0 to 9.3·1022 Am2 for sites with higher virtual geomagnetic pole latitudes. The new 39Ar/40Ar ages of 2.51 ± 0.27 Ma for Klöch and 2.39 ± 0.03 Ma for Steinberg allow for the correlation of the Styrian transitional directions with cryptochron C2r.2r-1 of the geomagnetic polarity time scale. Graphic abstract |
format |
Article in Journal/Newspaper |
author |
Elisabeth Schnepp Patrick Arneitz Morgan Ganerød Robert Scholger Ingomar Fritz Ramon Egli Roman Leonhardt |
author_facet |
Elisabeth Schnepp Patrick Arneitz Morgan Ganerød Robert Scholger Ingomar Fritz Ramon Egli Roman Leonhardt |
author_sort |
Elisabeth Schnepp |
title |
Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1 |
title_short |
Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1 |
title_full |
Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1 |
title_fullStr |
Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1 |
title_full_unstemmed |
Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1 |
title_sort |
intermediate field directions recorded in pliocene basalts in styria (austria): evidence for cryptochron c2r.2r-1 |
publisher |
SpringerOpen |
publishDate |
2021 |
url |
https://doi.org/10.1186/s40623-021-01518-w https://doaj.org/article/a1c1365bdfaa44ad8c26eef4020dbad6 |
genre |
Geomagnetic Pole |
genre_facet |
Geomagnetic Pole |
op_source |
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-21 (2021) |
op_relation |
https://doi.org/10.1186/s40623-021-01518-w https://doaj.org/toc/1880-5981 doi:10.1186/s40623-021-01518-w 1880-5981 https://doaj.org/article/a1c1365bdfaa44ad8c26eef4020dbad6 |
op_doi |
https://doi.org/10.1186/s40623-021-01518-w |
container_title |
Earth, Planets and Space |
container_volume |
73 |
container_issue |
1 |
_version_ |
1766006047840927744 |