Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for Magnetostratigraphy
Abstract Dating of upper Miocene sediments of the Pannonian Basin (Hungary) has proven difficult due to the endemic nature of biota, scarcity of reliable radio isotopic data, and generally inconsistent magnetostratigraphic results. The natural remanent magnetization (NRM) is mostly residing in greig...
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| Format: | Article |
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Wiley
2018-09-01
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| Series: | Geochemistry, Geophysics, Geosystems |
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| Online Access: | https://doi.org/10.1029/2018GC007673 |
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| author | Nick A. Kelder Karin Sant Mark J. Dekkers Imre Magyar Gijs A. vanDijk Ymke Z. Lathouwers Orsolya Sztanó Wout Krijgsman |
| author_facet | Nick A. Kelder Karin Sant Mark J. Dekkers Imre Magyar Gijs A. vanDijk Ymke Z. Lathouwers Orsolya Sztanó Wout Krijgsman |
| author_sort | Nick A. Kelder |
| collection | DOAJ |
| description | Abstract Dating of upper Miocene sediments of the Pannonian Basin (Hungary) has proven difficult due to the endemic nature of biota, scarcity of reliable radio isotopic data, and generally inconsistent magnetostratigraphic results. The natural remanent magnetization (NRM) is mostly residing in greigite (Fe3S4), which complicates NRM interpretation. We reinvestigate the viability of these sediments for magnetostratigraphy using samples from recently drilled well cores (PAET‐30 and PAET‐34) from the Paks region. Significant intervals of the cores contain composite NRM behavior. Thermal demagnetization results include multipolarity (M‐type) samples consisting of a low‐temperature (LT, above ~120 °C), a medium‐temperature (MT), and a high‐temperature (HT) component, within distinct temperature ranges and all exhibiting dual polarities. The LT and HT components have the same polarity and are antiparallel to the MT component. Rock magnetic and scanning electron microscopy results indicate that all magnetic components reside in authigenic greigite. The LT and HT components represent the characteristic remanent magnetization and are of early diagenetic origin. The MT component records a late diagenetic overprint. Alternating field demagnetization cannot resolve the individual components: it yields polarities corresponding to the dominant component resulting in erratic polarity patterns. Interpretation of LT and HT components allows a reasonably robust magnetostratigraphic correlation to the geomagnetic polarity time scale with the base of PAET‐30 at ~8.4 Ma and its top at ~6.8 Ma (average sedimentation rate of ~30 cm/kyr). The base of PAET‐34 is correlated to ~9 Ma and its top to ~6.8 Ma (average sedimentation rate of 27 cm/kyr). |
| format | Article |
| id | doaj-art-100018d583d34649bd6fee36cebf543e |
| institution | Kabale University |
| issn | 1525-2027 |
| language | English |
| publishDate | 2018-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj-art-100018d583d34649bd6fee36cebf543e2025-08-20T03:24:47ZengWileyGeochemistry, Geophysics, Geosystems1525-20272018-09-011993405342910.1029/2018GC007673Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for MagnetostratigraphyNick A. Kelder0Karin Sant1Mark J. Dekkers2Imre Magyar3Gijs A. vanDijk4Ymke Z. Lathouwers5Orsolya Sztanó6Wout Krijgsman7Paleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences Utrecht University Utrecht The NetherlandsPaleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences Utrecht University Utrecht The NetherlandsPaleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences Utrecht University Utrecht The NetherlandsMTA‐MTM‐ELTE Research Group for Paleontology Budapest HungaryPaleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences Utrecht University Utrecht The NetherlandsPaleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences Utrecht University Utrecht The NetherlandsDepartment of Physical and Applied Geology Eötvös Loránd University Budapest HungaryPaleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences Utrecht University Utrecht The NetherlandsAbstract Dating of upper Miocene sediments of the Pannonian Basin (Hungary) has proven difficult due to the endemic nature of biota, scarcity of reliable radio isotopic data, and generally inconsistent magnetostratigraphic results. The natural remanent magnetization (NRM) is mostly residing in greigite (Fe3S4), which complicates NRM interpretation. We reinvestigate the viability of these sediments for magnetostratigraphy using samples from recently drilled well cores (PAET‐30 and PAET‐34) from the Paks region. Significant intervals of the cores contain composite NRM behavior. Thermal demagnetization results include multipolarity (M‐type) samples consisting of a low‐temperature (LT, above ~120 °C), a medium‐temperature (MT), and a high‐temperature (HT) component, within distinct temperature ranges and all exhibiting dual polarities. The LT and HT components have the same polarity and are antiparallel to the MT component. Rock magnetic and scanning electron microscopy results indicate that all magnetic components reside in authigenic greigite. The LT and HT components represent the characteristic remanent magnetization and are of early diagenetic origin. The MT component records a late diagenetic overprint. Alternating field demagnetization cannot resolve the individual components: it yields polarities corresponding to the dominant component resulting in erratic polarity patterns. Interpretation of LT and HT components allows a reasonably robust magnetostratigraphic correlation to the geomagnetic polarity time scale with the base of PAET‐30 at ~8.4 Ma and its top at ~6.8 Ma (average sedimentation rate of ~30 cm/kyr). The base of PAET‐34 is correlated to ~9 Ma and its top to ~6.8 Ma (average sedimentation rate of 27 cm/kyr).https://doi.org/10.1029/2018GC007673greigitemultipolarity NRMLake Pannonlate diageneticpaleomagnetic dating |
| spellingShingle | Nick A. Kelder Karin Sant Mark J. Dekkers Imre Magyar Gijs A. vanDijk Ymke Z. Lathouwers Orsolya Sztanó Wout Krijgsman Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for Magnetostratigraphy Geochemistry, Geophysics, Geosystems greigite multipolarity NRM Lake Pannon late diagenetic paleomagnetic dating |
| title | Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for Magnetostratigraphy |
| title_full | Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for Magnetostratigraphy |
| title_fullStr | Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for Magnetostratigraphy |
| title_full_unstemmed | Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for Magnetostratigraphy |
| title_short | Paleomagnetism in Lake Pannon: Problems, Pitfalls, and Progress in Using Iron Sulfides for Magnetostratigraphy |
| title_sort | paleomagnetism in lake pannon problems pitfalls and progress in using iron sulfides for magnetostratigraphy |
| topic | greigite multipolarity NRM Lake Pannon late diagenetic paleomagnetic dating |
| url | https://doi.org/10.1029/2018GC007673 |
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