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| Titel |
Domains of Archean mantle lithosphere deciphered by seismic anisotropy – inferences from the LAPNET array in northern Fennoscandia |
| VerfasserIn |
J. Plomerova, L. Vecsey, V. Babuska, LAPNET Working Group |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 2, no. 2 ; Nr. 2, no. 2 (2011-12-15), S.303-313 |
| Datensatznummer |
250000601
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| Publikation (Nr.) |
 copernicus.org/se-2-303-2011.pdf |
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| Zusammenfassung |
| An international LAPNET array (2007–2009, http://www.oulu.fi/sgo-oty/lapnet)
of the POLENET/LAPNET sub-project of the POLENET-IPY consortium, related to
seismic and geodetic studies in the Arctic regions, consisted of about 60
broadband seismic stations located on the territory of northern Finland and
adjacent parts of Sweden, Norway and Russia. We analyze relative P-wave
travel-time deviations evaluated for a subset of 90 teleseismic events
recorded by the LAPNET array and show examples of lateral variations of
shear-wave splitting to demonstrate variability of fabrics of the Archean
mantle lithosphere. The initial results clearly demonstrate the Archean
mantle lithosphere consists of domains with consistent fabrics reflecting
fossil anisotropic structures. 3-D self-consistent anisotropic models with
inclined symmetry axes accommodate two independent sets of body-wave
anisotropic observations. Individual domains are delimited by boundaries
(sutures), where the anisotropic parameters change. The results obtained
from the LAPNET array fill a gap in structural studies of the upper mantle
beneath northern Fennoscandia. |
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