Paleomagnetism of trap intrusions, East Siberia: Implications to flood basalt emplacement and the Permo–Triassic crisis of biosphere

Konstantinov, K.M.; Bazhenov, M.L.; Fetisova, A.M.; Khutorskoy, M.D.

Авторы: Konstantinov Konstantin M., Bazhenov Mikhail L., Fetisova Anna M., Khutorskoy Mikhail D.
Журнал: Earth and Planetary Sciences Letters
Номер: 394
Год издания: 2014
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 242
Последняя страница: 253
DOI: 10.1016/j.epsl.2014.03.029
Аннотация: Despite decades of concentrated studies, flood basalts are still among the most enigmatic phenomena of the Earth evolution. An important reason for this, albeit not a sole one, is the still poorly known characteristics of volcanic activity, its distribution through time in particular. Really, the common accuracy of geochronological dating does not allow finding out whether traps were emplaced during one million years, or 100 ky, or 10 ky, whether magmatic activity was more or less uniform or concentrated in few powerful outbursts. In turn, many “trap-related” questions, from their origin to possible impact on the biosphere, still cannot be answered. With the purpose to address the above questions in mind, paleomagnetism has already been applied to flood basalts but the data are still too limited for general conclusions. These ambiguities are fully applicable to the Siberian traps, which are among the largest volcanic provinces of the world. We studied minor trap intrusions along two long profiles in the eastern part of the province and found that most site-mean directions are grouped several times tighter than is common for the data on thick lava series and dyke swarms; similar over-grouping is found in other parts of the Siberian trap province two. We argue that this phenomenon is most likely related to nearly simultaneous emplacement of trap intrusions over areas of several ten to few hundred kilometers in dimension for few millenniums. Moreover, such brief events account for all, or nearly all, magmatism in each area; how such events correlate over the entire trap province, however, remains an open question. Also, we discuss the implications that the proposed scenario imposes on paleomagnetism of flood basalts.
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Paleomagnetism of trap intrusions, East Siberia: Implications to flood basalt emplacement and the Permo–Triassic crisis of biosphereстатья

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