Palaeomagnetism of Middle Ordovician Carbonate Sequence, Vaivara Sinimaed Area, Northeast Estonia, Baltica

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Plado , J , Preeden , U , Joeleht , A , Pesonen , L J & Mertanen , S 2016 , ' Palaeomagnetism of Middle Ordovician Carbonate Sequence, Vaivara Sinimaed Area, Northeast Estonia, Baltica ' , Acta Geophysica , vol. 64 , no. 5 , pp. 1391-1411 . https://doi.org/10.1515/acgeo-2016-0066

Title: Palaeomagnetism of Middle Ordovician Carbonate Sequence, Vaivara Sinimaed Area, Northeast Estonia, Baltica
Author: Plado, Juri; Preeden, Ulla; Joeleht, Argo; Pesonen, Lauri J.; Mertanen, Satu
Contributor: University of Helsinki, Department of Physics
Date: 2016-10
Language: eng
Number of pages: 21
Belongs to series: Acta Geophysica
ISSN: 1895-7455
URI: http://hdl.handle.net/10138/232689
Abstract: The hill range of Vaivara Sinimaed in northeast Estonia consists of several narrow east-to northeast-trending glaciotectonic fold structures. The folds include tilted (dips 4-75 degrees) Middle Ordovician (early Darriwilian) layered carbonate strata that were studied by mineralogical, palaeomagnetic, and rock magnetic methods in order to specify the post-sedimentational history of the area and to obtain a better control over the palaeogeographic position of Baltica during the Ordovician. Mineralogical studies revealed that (titano) magnetite, hematite, and goethite are carriers of magnetization. Based on data from 5 sites that positively passed a DC tilt test, a south-easterly downward directed component A (D-ref = 154.6 degrees +/- 15.3 degrees, I-ref = 60.9 degrees +/- 9.7 degrees) was identified. The component is carried by (titano) magnetite, dates to the Middle Ordovician (Plat = 17.9 degrees, Plon = 47.3 degrees, K = 46.7, A95 = 11.3 degrees), and places Baltica at mid-southerly latitudes. Observations suggest that in sites that do not pass the tilt test, the glaciotectonic event has caused some rotation of blocks around their vertical axis.
Subject: Baltica plate
Estonia
Ordovician
rock magnetism
palaeomagnetism
FERROMAGNETIC MINERALS
LIMESTONES
MAGNETIZATIONS
CONSTRAINTS
TEMPERATURE
MAGNETITE
SEDIMENTS
HISTORY
ORIGIN
SEA
1171 Geosciences
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