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Tsodilo Resources Limited: Ngamiland Iocg Complex
Jan. 18, 2011 (Filing Services Canada) -- Tsodilo Resources Limited (TSD - TSX Venture), ("Tsod...
About this update from Tsodilo Resources Limited
[{"type":"text","content":"\nTsodilo Resources Limited: Ngamiland Iocg Complex\n\n\n Jan. 18, 2011 (Filing Services Canada) -- Tsodilo Resources Limited (TSD - TSX Venture), (\"Tsodilo\" or the \"Company\") is pleased to announce the results of the first age-dating done by modern geochronological techniques in Ngamiland which has a main bearing on the mineralization model of the area, and the scheduling of a workshop on the geological model with the technical staff at AEON (UCT) in Cape Town on February 9, 2011.Recent dating by AEON's research group at UCT highlights the presence in Ngamiland of Archean granite-gneisses (ca. 2550 Ma), intruded by Paleoproterozoic granites (ca. 2000 Ma), which have been tectonically interlayered with Pan-African meta-sediments (including graphitic schist, carbonates, diamictites and metabasalts (ca. 540 Ma). The tectonic contacts and graphitic schists are mineralized and have been targeted for further work. This is the first time Archean-Paleoproterozoic basement rocks have been discovered in this NW part of Botswana. The 2 billion year old granites can be correlated with either the nearby Quangwadum and Okwa Complex in Botswana, and with the granites of the Bushveld intrusion in South Africa, suggesting the possibility of a large cryptic mineralized mafic intrusion in the region, or with the Kibaran granitic basement (ca. 2050 Ma) to the Katangan Supergroup beneath the Lufilian Arc in the DRC. The Pan African metabasalt in Nagamiland yield an age of ca. 535 Ma. This is younger than the metabasalts of the Matchless Amphibolite Belt (MAB) and Katanga (ca. 765 Ma), but similar to the age of peak metamorphism and deformation in the MAB and Lufilian Arc (ca. 530 Ma). This difference can be accounted for through the higher degrees of Pan African deformation and metamorphism found in Ngamiland (e.g. the new age is a tectonically reset age rather than a magmatic age) and/or that the metabasalts of Ngamiland represent subducted basaltic MAB-like oceanic crust that has been recycled as island arc basalts. Either way, the new dates strengthen the previous suggestions by Tsodilo of a correlation between the mineralized Pan African rocks and basement in Ngamiland with those in the Central African Copper Belt, and those in the MAB. Work with AEON is ongoing to refine the geological models.The presence of the layered and massive magneti...