Age of magnetization of Mesoproterozoic rocks from the Natal sector of the Namaqua-Natal belt, South Africa

Thomas, Robert James; Gose, W.; Johnston, S.T.. 2005 Age of magnetization of Mesoproterozoic rocks from the Natal sector of the Namaqua-Natal belt, South Africa. Journal of African Earth Sciences, 40 (3). 137-145.

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We report paleomagnetic results from Mezoproterozoic rocks from the Margate and Mzumbe terranes of the Natal belt, KwaZulu-Natal, South Africa. The Port Edward pluton, a member of the Oribi Gorge Suite, yields a pole position at 7.4S, 327.8E, A95 = 4.2. The magnetic remanence of these magnetite-bearing rocks was not acquired soon after crystallization at 1025 Ma but only when the sampling area cooled below 500 C at about 1005 Ma. Similar results have been reported from the western (Namaqualand) sector of the Namaqua-Natal Belt which suggests that the entire belt underwent a similar tectono-metamorphic history. The tonalitic Mzumbe Gneiss was intruded by a swarm of porphyroblastic metadolerite dykes. The magnetization of these Equeefa dykes and the gneissic wall rock is carried by titano-maghemite with Curie temperatures between 330 and 400 C. Their magnetization was reset at about 530 Ma after burial and exhumation and they yield a pole position at 24.7N, 17.4E, A95 = 10.6. These results demonstrate the difficulty in finding rocks on the Kalahari craton that would yield pole positions to fill the data gap in the apparent polar wander path between 1.1 and 1.0 Ga, a critical time span for Rodinia reconstructions, and provide the first dated Cambrian pole position for the Kalahari craton.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BGS Programmes > International
Additional Keywords: Namaqua-Natal Belt; Mzumbe terrane; Oribi Gorge; Remagnetization; Rodinia; Mesoproterozoic
NORA Subject Terms: Earth Sciences
Date made live: 13 Jan 2009 10:13 +0 (UTC)

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