HR: 0800h
AN: GP11A-0008    [Abstracts]
TI: Paleomagnetic Evidence for Large Scale Southward Translation of Crimea (East European Platform) During the Jurassic
AU: Meijers, M J
EM: meijers@geo.uu.nl
AF: Paleomagnetic Laboratory Fort Hoofddijk, Dept. of Earth Sciences, Utrecht University, Budapestlaan 17, Utrecht, 3584 CD Netherlands
AU: Deenen, M H
EM: deenen@geo.uu.nl
AF: Paleomagnetic Laboratory Fort Hoofddijk, Dept. of Earth Sciences, Utrecht University, Budapestlaan 17, Utrecht, 3584 CD Netherlands
AU: Saintot, A
EM: aline.saintot@falw.vu.nl
AF: Dept. of Tectonics and Structural Geology, Free University, De Boelelaan 1085, Amsterdam, 1081 HV Netherlands
AU: Stephenson, R
EM: randell.stephenson@falw.vu.nl
AF: Dept. of Tectonics and Structural Geology, Free University, De Boelelaan 1085, Amsterdam, 1081 HV Netherlands
AU: Krijgsman, W
EM: krijgsma@geo.uu.nl
AF: Paleomagnetic Laboratory Fort Hoofddijk, Dept. of Earth Sciences, Utrecht University, Budapestlaan 17, Utrecht, 3584 CD Netherlands
AU: * Langereis, C G
EM: langer@geo.uu.nl
AF: Paleomagnetic Laboratory Fort Hoofddijk, Dept. of Earth Sciences, Utrecht University, Budapestlaan 17, Utrecht, 3584 CD Netherlands
AB: The East European Platform, and especially the area surrounding the Black Sea (North Dobrogea, Crimea, Caucasus, Pontides), is a very suitable region to study the behaviour of large scale tectonic proecesses like (lithospheric) fault zones and terrane accretion, because subduction processes have continuously been taking place over a 400 Myr period (Devonian-Neogene). Major controversies still exist, however, on the mechanisms that have been active. Therefore, detailed knowledge of the paleolatitudinal positions of the different blocks and plates through time is a prerequisite for testing the different hypotheses. In this context, it is important to realise that paleomagnetic results from sediments typically show (too) low inclinations, caused by the inclination error. A recently published field model (TK03.GAD, of Tauxe and Kent, 2004) may prove useful, however, to overcome this restriction, provided that a sufficient numbers of samples is available (> 100). We therefore took an appropriately large number of paleomagnetic samples from several sedimentary sequences of Triassic and Jurassic age, Here, we report the first results on the Crimean Peninsula and the North Dobrogea Orogen. We conclude that the Jurassic rocks from Crimea have originally been formed at very low equatorial latitudes, in contrast to existing data and to current tectonic hypotheses. Alternatively, the European APWP for this timespan may be flawed, for which recently evidence was published (Muttoni et al., 2005). Unfortunately, it appeared that the results from Triassic sections in North Dobrogea are disappointing: we must conclude that we have insufficiently been able to remove a younger overprint.
DE: 1525 Paleomagnetism applied to tectonics: regional, global
DE: 1527 Paleomagnetism applied to geologic processes
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005