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Paleointensity dete...
Paleointensity determination on a 1.786 Ga old gabbro from Hoting, Central Sweden
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- Donadini, Fabio (författare)
- Institut für Geophysik, ETH Zürich
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- Elming, Sten-Åke (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik,Luleå Tekniska Universitet
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- Tauxe, Lisa (författare)
- Scripps Institution of Oceanography, University of California, San Diego,University of California, La Jolla
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- Hålenius, Ulf (författare)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Swedish Museum of Natural History, Department of Mineralogy
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(creator_code:org_t)
- Elsevier BV, 2011
- 2011
- Engelska.
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Ingår i: Earth and Planetary Science Letters. - : Elsevier BV. - 0012-821X .- 1385-013X. ; 309:3-4, s. 234-248
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Paleointensities from Precambrian rocks are rare and might be biased by remagnetization processes. Here we present new analyses of samples from a 1.786 Ga gabbro near Hoting, Central Sweden. Rock magnetic and mineralogical analyses indicate that one of the sites (site 5) may be pristine, whereas the others exhibit evidence of alteration. Characteristic remanent magnetization was determined using principal component analysis for each sample and was compared with results obtained in a previous study of Elming et al. (2009). Intensity measurements from site 5 show higher values compared to those of the other sites, suggesting that alteration processes may lead to underestimation of the field intensity. After cooling rate and anisotropy correction, the field moment at 1.786 Ga was estimated to be 25.6 ± 3.3 ZAm2 and 15.2 ± 6.1 ZAm2 from site 5 only and from all sites respectively. We consider the result from site 5 to be more accurate owing to the lack of evidence for alteration; our estimates agree well with the Proterozoic VDM values suggested by Biggin et al. (2009).
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Nyckelord
- Applied Geophysics
- Tillämpad geofysik
- The changing Earth
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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