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A new 1.42 GA paleomagnetic pole from the Amazonian craton: implications for the Columbia supercontinent configuration
Universidade de São Paulo.
Universidade de São Paulo.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Universidade de São Paulo.
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2011 (English)In: Proceedings of Second Biennial Meeting of Latinmag: Tandil Argentina, November 2011, 2011Conference paper (Other academic)
Abstract [en]

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.

Place, publisher, year, edition, pages
, Latinmag Letters, 2
Research subject
Applied Geophysics
URN: urn:nbn:se:ltu:diva-29720Local ID: 3480c8bd-eb20-42d8-88d7-50ba1ac735daOAI: diva2:1002945
Biennial Meeting of the Latin-American Association of Paleomagnetism and Geomagnetism (LATINMAG) : 23/11/2011 - 26/11/2011
Godkänd; 2011; 20111214 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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