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| Titel |
Subsurface mapping of marlstone and limestone facies in the Silurian bedrock of Gotland, by use of Radiomagnetotelluric (RMT) methods |
| VerfasserIn |
Jan Mikael Erlstroem, Lena Persson |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250095033
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| Publikation (Nr.) |
 EGU/EGU2014-10473.pdf |
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| Zusammenfassung |
| The Silurian bedrock on the island of Gotland in the central Baltic Sea is composed of a
series of stacked carbonate platforms. Up to 10 cycles of shallow marine back reef,
reef and fore reef limestone overlie and interfinger with shallow shelf marl and
marlstone deposits. Three main regional, up to 70 m thick limestone dominated bodies
with high electrical resistivity are clearly marked in the electromagnetic map. The
subsurface structural framework of the different lithofacies is at presently less well
known. There is therefore a great interest to develop and test the applicability of
different geophysical methods for this purpose. Especially as the limestone bodies
constitute important groundwater aquifers and raw material to the lime and steel
industry. The primary aim of this investigation is to assess the application of the
RMT method regarding obtaining information on the thickness of the limestone
body and the subsurface distribution of different lithofacies on central Gotland.
RMT is an electromagnetic method that make use of distant radio transmitters in
the frequency range between 10-250 kHz. A significant difference in resistivity
between the limestone (1000–10000 Ωm) and the marlstone ( |
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