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Columbia revisited: paleomagnetic results from the 1790 Ma colider volcanics (SW Amazonian Craton, Brazil)
Universidade de São Paulo.
Universidade de São Paulo.
Universidade de São Paulo.
Universidade de São Paulo.
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2008 (English)In: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 164, no 1-2, p. 40-49Article in journal (Refereed) Published
Abstract [en]

In an attempt to improve our understanding of the Paleoproterozoic geodynamic evolution, a paleomagnetic study was performed on 10 sites of acid volcanic rocks of the Colider Suite, southwestern Amazonian Craton. These rocks have a well-dated zircon U-Pb mean age of 1789 +/- 7 Ma. Alternating field and thermal demagnetization revealed northern (southern) directions with moderate to high upward (downward) inclinations. Rock magnetism experiments and magnetic mineralogy show that this characteristic magnetization is carried by Ti-poor magnetite or by hematite that replaces magnetite by late-magmatic cleuteric alteration. Both magnetite and hematite carry the same characteristic component. The mean direction (Dm = 183.0 degrees, Im = 53.5 degrees, N = 10, alpha(95) = 9.8 degrees, K = 25.2) yielded a paleomagnetic pole located at 298.8 degrees E, 63.3 degrees S (alpha(95) = 10.2 degrees, K = 23.6), which is classified with a quality factor Q = 5. Paleogeographic reconstructions using this pole and other reliable Paleoproterozoic poles suggest that Laurentia, Baltica, North China Craton and Amazonian Craton were located in laterally contiguous positions forming a large continental mass at 1790 Ma ago. This is reinforced by geological evidence which support the existence of the supercontinent Columbia in Paleoproterozoic times.

Place, publisher, year, edition, pages
2008. Vol. 164, no 1-2, p. 40-49
National Category
Geophysics
Research subject
Applied Geophysics
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URN: urn:nbn:se:ltu:diva-7947DOI: 10.1016/j.precamres.2008.03.004ISI: 000257534600003Scopus ID: 2-s2.0-44649136187Local ID: 66258420-6914-11dd-9843-000ea68e967bOAI: oai:DiVA.org:ltu-7947DiVA, id: diva2:980837
Note
Validerad; 2008; 20080813 (bajo)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Elming, Sten-åke

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