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A new 1.42 GA paleo...
A new 1.42 GA paleomagnetic pole from the Amazonian craton : implications for the Columbia supercontinent configuration
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- D’Agrella-Filho, Manoel S. (författare)
- Universidade de São Paulo
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- Trindade, Ricardo I.F. (författare)
- Universidade de São Paulo
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- Elming, Sten-åke (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Yokoyama, Eder (författare)
- Universidade de São Paulo
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- Bispo-Santos, Franklin (författare)
- Universidade de São Paulo
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(creator_code:org_t)
- 2011
- 2011
- Engelska.
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Ingår i: Proceedings of Second Biennial Meeting of Latinmag.
- Relaterad länk:
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http://www.geofisica...
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https://ltu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Paleomagnetic studies carried out on the 1.42 Ga Indiavaí mafic intrusive rocks, that crop out in the SW Mato Grosso State provides a great opportunity to test the proposed paleogeographic models for Columbia. Paleomagnetic AF and thermal treatment revealed south/southwest magnetic directions with downward inclinations for sixteen analyzed sites. These directions are probably carried by SD/PSD magnetite with high coercivities and high unblocking temperatures as indicated by additional magnetic tests, including thermomagnetic curves, hysteresis loops and the IRM acquisition curves. A different magnetization obtained for host mafic rocks from the basement ca. 10 km NW away from the Indiavaí intrusive, further attests to the primary origin of the characteristic magnetic component. A mean site direction was calculated at Dm=209.8°, Im=50.7° (α95=8.0°, K=22.1), which yielded a paleomagnetic pole located at 249.7°E, -57.0°N (A95=8.6°). Comparison of this pole with other paleomagnetic poles of similar age from Baltica and Laurentia provides evidence for a link of north-northeastern Amazonian craton, southwestern Baltica and Laurentia, as previously suggested from the similar Mesoproterozoic geological evolution of their margins.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Nyckelord
- Tillämpad geofysik
- Applied Geophysics
Publikations- och innehållstyp
- vet (ämneskategori)
- kon (ämneskategori)