Magnetic susceptibility of Middle Ordovician sedimentary rocks, Pakri Peninsula, NW Estonia

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dc.contributor.author Plado, Juri
dc.contributor.author Ainsaar, Leho
dc.contributor.author Dmitrijeva, Marija
dc.contributor.author Poldsaar, Kairi
dc.contributor.author Ots, Siim
dc.contributor.author Pesonen, Lauri J.
dc.contributor.author Preeden, Ulla
dc.date.accessioned 2017-05-11T12:31:01Z
dc.date.available 2017-05-11T12:31:01Z
dc.date.issued 2016-09
dc.identifier.citation Plado , J , Ainsaar , L , Dmitrijeva , M , Poldsaar , K , Ots , S , Pesonen , L J & Preeden , U 2016 , ' Magnetic susceptibility of Middle Ordovician sedimentary rocks, Pakri Peninsula, NW Estonia ' , Estonian Journal of Earth Sciences , vol. 65 , no. 3 , pp. 125-137 . https://doi.org/10.3176/earth.2016.11
dc.identifier.other PURE: 80901399
dc.identifier.other PURE UUID: cb37f278-e0f2-419e-b0f5-311a6e86e617
dc.identifier.other WOS: 000383310800001
dc.identifier.other Scopus: 84985963169
dc.identifier.other ORCID: /0000-0001-7410-4193/work/43412856
dc.identifier.uri http://hdl.handle.net/10138/183973
dc.description.abstract Magnetic susceptibility (MS), its frequency-dependence and anisotropy of the Middle Ordovician Dapingian and Darriwilian sedimentary sequence from three sites (Uuga, Testepere and Leetse) in the Pakri Peninsula, NW Estonia are analysed in combination with the mineralogical composition. The study is based on 463 cores drilled at intervals of a few centimetres to a maximum of about 1 m. All the samples show low and positive MS, which suggests the presence of small quantities of paraand/or ferromagnetic minerals. The stratigraphic units of the three studied sites have a similar along-section appearance, which provides a base for a composite curve. The relatively higher susceptibilities are carried by secondary Fe-Ti oxides (Toila Formation), goethite ooids (Kandle Formation) and ferrous dolomite (Pae Member), whereas paramagnetic minerals are mostly responsible for the rest of the sequence. Considering the dependence of MS on regressive transgressive cycles (high/low MS within deposits of regressive/transgressive parts of the cycles, respectively), the MS data do not agree with sedimentologically derived sea-level compilations. The measured changes in MS in the Pakri Peninsula outcrops correlate at certain characteristic levels with those deposited in the deeper part of the palaeobasin (Viki core), indicating that the post-depositional iron mobilization within the sediments took place at least at a regional level. Because of post-depositional reorganization of ferromagnetic carrier minerals, the MS values may, however, not be used as a detrital proxy. en
dc.format.extent 13
dc.language.iso eng
dc.relation.ispartof Estonian Journal of Earth Sciences
dc.rights cc_by_nc
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject magnetic susceptibility
dc.subject carbonate rocks
dc.subject Ordovician
dc.subject Estonia
dc.subject EIFELIAN-GIVETIAN GSSP
dc.subject EAST EUROPEAN CRATON
dc.subject SEA-LEVEL
dc.subject MAGNETOSTRATIGRAPHY SUSCEPTIBILITY
dc.subject MAGNETOSUSCEPTIBILITY EVENT
dc.subject SILICICLASTIC SEDIMENTS
dc.subject NORTHWESTERN ESTONIA
dc.subject OSMUSSAAR BRECCIA
dc.subject BASIN
dc.subject BOUNDARY
dc.subject 1171 Geosciences
dc.subject 114 Physical sciences
dc.title Magnetic susceptibility of Middle Ordovician sedimentary rocks, Pakri Peninsula, NW Estonia en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Division of Geophysics and Astronomy (-2017)
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.3176/earth.2016.11
dc.relation.issn 1736-4728
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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