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

• Autorzy: Plado J. , Preeden U. , Joeleht A. , Pesonen L. J. , Mertanen S.

Identyfikatory

DOI

10.1515/acgeo-2016-0066

• Języki publikacji: EN

Abstrakty

EN

The hill range of Vaivara Sinimäed in northeast Estonia consists of several narrow east- to northeast-trending glaciotectonic fold structures. The folds include tilted (dips 4-75°) Middle Ordovician (early Darriwilian) layered carbonate strata that were studied by mineralogical, palaeomagnetic, and rock magnetic methods in order to specify the postsedimentational 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 (Dref = 154.6°± 15.3°, Iref = 60.9°± 9.7°) was identified. The component is carried by (titano)magnetite, dates to the Middle Ordovician (Plat = 17.9°, Plon = 47.3°, K = 46.7, A95 = 11.3°), 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.

Słowa kluczowe

EN

Baltic plate; Estonia; Ordovician; rock magnetism; palaeomagnetism

PL

płyta bałtycka; Estonia; ordowik; skała magnetyczna; paleomagnetyzm

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2016
• Tom: Vol. 64, no. 5
• Strony: 1391--1411
• Opis fizyczny: Bibliogr. 37 poz.

Twórcy

autor

Plado J.

• Department of Geology, University of Tartu, Tartu, Estonia

autor

Preeden U.

• Department of Geology, University of Tartu, Tartu, Estonia
• Põlva County Government, Põlva, Estonia

autor

Joeleht A.

• Department of Geology, University of Tartu, Tartu, Estonia

autor

Pesonen L. J.

• Division of Physics, University of Helsinki, Helsinki, Finland

autor

Mertanen S.

• Geological Survey of Finland, Espoo, Finland

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