Palaeomagnetic age of remagnetizations in Silurian dolomites, Rástla quarry (Central Estonia)

• Autorzy: Plado J. , Preeden U. , Puura V. , Pesonen L. J. , Kirsimäe K. , Pani T. , Elbra T.
• Języki publikacji: EN

Abstrakty

EN

Alternating field and thermal demagnetization of dolomite samples from the Silurian (Llandovery) horizontally-bedded sequence of central Estonia reveal two secondary magnetization components (A and B) both of chemical origin. A low-coercivity (demagnetized at -50 mT) component A (D = 60.7°, I = 7.7°, alfa95 = 16.6°) with high dispersion (k = 14.2), yields a palaeopole at 18.2°N and 139.5°E that points towards the Late Devonian — Mississipian segment of the Baltica APWP (Apparent Polar WanderPath). A high-coercivity component B (D = 13.5°, I = 60.7°, k = 67.0, alfa 95 = 4.7°) carries both normal and reversed polarities. Comparing the palaeopole (71.1°N and 173.3°E) with the European APWP reveals a Cretaceous age. These two remagnetizations are linked to mineral assemblages of magnetite and maghemite (A), and hematite (B) determined from mineralogical (X-ray, SEM and optical microscopy) and rock magnetic (acquisition and thermal demagnetization of a 3-component IRM; Lowrie-test) studies. The results suggest that the first (A) Palaeozoic remagnetization was caused by low-temperature hydrothermal circulation due to the influence of the Caledonian (more likely) or Hercynian Orogeny after the diagenetic dolomitization of carbon ates. Hematite, carrying the component B, and goethite, are the latest ferromagnetic minerals that have precipitated into the existing pore space (hematite) and walls of microscopic fractures (goethite) that opened to allow ac cess for oxygen-rich fluids during the Late Mesozoic.

Słowa kluczowe

EN

Estonia; Baltica; Silurian; palaeomagnetism; remagnetization; dolomites

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2008
• Tom: Vol. 52, No 3
• Strony: 213--213
• Opis fizyczny: –224, bibliogr. 24 poz., rys., tab., wykr.

Twórcy

autor

Plado J.

autor

Preeden U.

autor

Puura V.

autor

Pesonen L. J.

autor

Kirsimäe K.

autor

Pani T.

autor

Elbra T.

• Department of Geoogy, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia;,

Bibliografia

• ALM E., HUHMA H. and SUNDBLAD H. (2005) - Preliminary Palaeozoic Sm-Nd ages of fluorite-calcite-galena veins in the south-eastern part of the Fennoscandian Shield. Swedish Nuclear Fuel and Waste Management Co, Report R-04-27: 1-32.
• BESSE J. and COURTILLOT V. (2003) - Correction to "Apparent and true polar wander and the geometry of the geomagnetic field over the last 200 Myr". J. Geophys. Res., 108: EPM 3 (1-2).
• BYLINO L. V., MAKAROV V. G., BORDON I. P., ZARZHITSKIJ G. F., BORDON V. E., KRIVODUBSKAYA Z. V., PUURA V. A., FEDORENKO YA. D., MENAKER E. A. and VASIL'EV B. A. (1970) - Perspectives of search for ore deposits in Bielorussia and Baltic states (in Russian). Sovet. Geol., 13: 3-14.
• DUNLOP D. J. and ÖZDEMIR Ö. (1997) - Rock Magnetism. Cambridge Univ. Press. Cambridge.
• FISHER R. (1953) - Dispersion on a sphere. Proc.. Royal Soc., London, A217: 293-305.
• GRADSTEIN F. M., OGG J. G., SMITH A. G., AGTERBERG F. P., BLEEKER W., COOPER R. A., DAVYDOV V., GIBBARD P., HINNOV L. A., HOUSE M. R., LOURENS L., LUTERBACHER H. P., MCARTHUR J., MELCHIN M. J., ROBB L. J., SHERGOLD J., VILLENEUVE M., WARDLAW B. R., ALI J., BRINKHUIS H., HILGEN F. J., HOOKER J., HOWARTH R. J., KNOLL A. H., LASKAR J., MONECHI S., PLUMB K. A., POWELL J., RAFFI I., RÖHL U., SADLER P., SANFILIPPO A., SCHMITZ B., SHACKLETON N. J., SHIELDS G. A., STRAUSS H., VAN DAM J., VAN KOLFSCHOTEN T., VEIZER J. and WILSON D. (2004) - A Geologic Time Scale 2004. Cambridge Univ. Press. Cambridge.
• JOHNSON G. R. and OLHOEFT G. R. (1984) - Density of rocks and minerals. In: Handbook of Physical Properties of Rocks, vol. III (ed. R. S. Carmichael): 1-38. CRC Press. Boca Raton.
• JÜRGENSON E. (1970) - Secondary changes of the Silurian sequence (in Russian). In: Silurian of Estonia (ed. D. Kaljo): 96-101. Valgus. Tallinn.
• KATINAS V. and NAWROCKI J. (2004) - Mesozoic remagnetization of Upper Devonian carbonates from Ćesis and Skaistgirys quarries (Baltic states). Geol. Quart., 48 (3): 293-298.
• KIIPLIT. (1983) - On the genesis of Ordovician and Silurian dolomites at the contact with Devonian deposits (in Russian). Proc. Estonian Acad. Sc., 32: 110-117.
• KIRSCHVINK J. L. (1980) - The least-squares line and plane and the analysis of palaeomagnetic data. Geophys. J. Royal Astronom. Soc., 62: 699-718.
• KLEESMENT A. and MARK-KURIK E. (1997) - Lower Devonian. In: Geology and Mineral Resources of Estonia (eds. A. Raukas and A. Teedumäe): 107-111. Estonian Acad. Publ., Tallinn.
• KRZEMINSKA E., WISZNIEWSKA J. and WILLIAMS I. S. (2006) - Early Carboniferous age of the cratonic intrusions in the crystalline basement of NE Poland (in Polish with English summary). Prz. Geol., 54 (9): 1093-1098.
• LEWCHUK M. T., AL-AASM I. S., SYMONS D. T. A. and GILLEN K. P. (2000) - Late Laramide dolomite recrystallization of the Husky Rainbow "A" hydrocarbon Devonian reservoir, northwestern Alberta, Canada: paleomagnetic and geochemical evidence. Canadian J. Earth Sc., 37: 17-29.
• LOWRIE W. (1990) - Identification of ferromagnetic minerals in a rock by coercivity and unblocking temperature properties. Geophys. Res. Lett., 17: 159-162.
• MCCABE C. and ELMORE R. D. (1989) - The occurrence and origin of late Paleozoic remagnetization in the sedimentary rocks of North America. Geophysics, 2: 471-494.
• MCFADDEN P. L. and MCELHINNEY M. W. (1990) - Classification of the reversal test in palaeomagnetism. Geophys. J. Internat., 103: 725-729.
• NESTOR H. (1997) - Silurian. In: Geology and Mineral Resources of Estonia (eds. A. Raukas and A. Teedumäe): 89-106. Estonian Acad. Publ., Tallinn.
• NESTOR H. and EINASTO R. (1997) - Ordovician and Silurian carbon-ate sedimentation basin. In: Geology and Mineral Resources of Estonia (eds. A. Raukas and A. Teedumäe): 192-204. Estonian Acad. Publ., Tallinn.
• PUURA V. and SUDOV B. (1976) - The tectonically active platform zones on the south slope of the Baltic Shield and their metallogeny (in Russian with English summary). Proc. Acad. Sc. Estonian SSR. Chem. Geol., 25: 206-214.
• PUURAV.,AMANTOVA., SVIRIDOVN. andKANEVS. (1991) -Tectonics (in Russian). In: Geology and Geomorphology of the Baltic Sea (ed. A. A. Grigelis): 267-290. Nedra, Leningrad.
• PUURA V., VAHER R. and TUULING I. (1999) - Pre-Devonian landscape of the Baltic Oil-Shale Basin, NW of the Russian platform. In: Uplift, Erosion and Stability: Perspectives on Long-term Landscape Development (eds. B. J. Smith et al.). Geol. Soc., London,. Spec. Publ., 162: 75-83.
• SUNDBLAD K., KIVISILLA J., PUURA V., JONSSON E. and FEDORENKO J. (1999) - Palaeozoic Pb (±Zn) mineralization in the Baltic Sea region. GFF, 121: 76-77.
• TAYLOR J. C. (1991) - Computer programs for standardless quantitative analysis of minerals using the full powder diffraction profile. Powder diffraction, 6: 2-9.224Jüri Plado et al.
• TEEDUMÄE A., KALLASTE T. and KIIPLI T. (2001) - Aspects of the dolomitization of the Máhküla beds (Silurian, Estonia). Proc. Estonian Acad. Sc., 50: 190-205.
• TORSVIK T. H. (1998) - Palaeozoic palaeogeography: a North Atlantic viewpoint. GFF, 120: 109-118.
• TORSVIK T. H., SMETHURST M. A., MEERT J. G., VAN DER VOO R., MCKERROW W. S., BRASIER M. D., STURT B. A. and WALDERHAUG H. J. (1996) - Continental break-up and collision in the Neoproterozoic and Palaeozoic - A tale of Baltica and Laurentia. Earth Sc. Rev., 40: 229-258.
• TORSVIK T. H., VAN DER VOO R., MEERT J. G., MOSAR J. and WALDERHAUG H. J. (2001) - Reconstructions of the continents around the North Atlantic at about the 60th parallel. Earth Planet. Sc. Lett., 187: 55-69.
• VAASJOKIM., APPELQVIST H. J. A. and KINNUNEN K. (2002) - Paleozoic remobilization and enrichment of Proterozoic uranium mineralization in the East Uusimaa area, Finland. In: Lithosphere 2002 Second Symposium on the Structure, Composition and Evolution of the Lithosphere in Finland. Programme and extended abstracts, Espoo, Finland (eds. R. Lahtinen et al.). Institute of Seimology, Univ. Helsinki, Report S-42.
• VAHER R. M., PUURA V. A. and ERISALU E. K. (1962) - Tectonism of NE Estonia (in Russian). In: Geology of Paleozoic. Valgus, Tallinn.
• VAN DER VOO R. (1990) - The reliability of paleomagnetic data. Tectonophysics, 184: 1-9.
• VINGISAAR P. A. and TAALMANN V. A. (1974) - An overview on the dolomitization of lower-Paleozoic carbonate rocks in Estonia (in Russian). Proc. Acad. Sc. Estonian SSR. Chem. Geol., 3: 237-243.
• ZIJDERVELD D. J. (1967) - A.C. demagnetization in rocks: analysis of results. In: Methods in Paleomagnetism (eds. D. W. Collinson et al.): 254-286. Elsevier, Amsterdam.