mafic volcanics

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• Musgrave Block — The Musgrave Block is an east west trending belt of Proterozoic granulite gneiss basement rocks approximately 500km long. The Musgrave Block extends from western South Australia into Western Australia. The Musgrave Block is primarily exposed… …   Wikipedia

• Circum-Superior Belt — Map of cratons, orogenies and the Circum Superior Belt. Areas associated with the Circum Superior Belt include …   Wikipedia

• Geology of Tasmania — Tasmania has a varied geological history, with the world s biggest exposure of diabase, or dolerite. Rocks from the Neoproterozoic, Paleozoic and Mesozoic time periods appear. It is one of the few southern hemisphere areas glaciated during the… …   Wikipedia

• Duluth Complex — Shaded relief image showing Duluth Complex arcing from Duluth to Pigeon Point, interrupting and splitting the Mesabi and Gunflint Ranges The Duluth Complex, the related Beaver Bay Complex (often treated as part of the Duluth Complex),[1] and the… …   Wikipedia

• Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …   Universalium

• Volcanogenic massive sulfide ore deposit — Volcanogentic massive sulfide ore deposit at Kidd Mine, Timmins, Ontario, Canada, formed 2.4 billion years ago on an ancient seafloor. Volcanogenic massive sulfide ore deposits (VMS ) are a type of metal sulfide ore deposit, mainly Cu Zn Pb which …   Wikipedia

• Gawler craton — The Gawler Craton covers approximately 440,000 square kilometres of central South Australia. Its Precambrian crystalline basement crustal block was cratonised ca. 1550 1450 Ma. Prior to 1550 Ma the craton comprised a number of active Proterozoic… …   Wikipedia

• Baltic Shield — The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia (Norway, Sweden and Finland), northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the exposed Precambrian northwest segment of …   Wikipedia

• Kaapvaal craton — The Kaapvaal craton (Limpopo province of South Africa), along with the Pilbara craton of Western Australia, are the only remaining areas of pristine 3.6 2.5 Ga crust on Earth. Similarities of rock records from both these cratons, especially of… …   Wikipedia

• Geology of the Iberian Peninsula — The geology of the Iberian Peninsula consists of the study of the rock formations on the Iberian Peninsula, which includes Spain, Portugal, Andorra, and Gibraltar. The peninsula contains rocks from every age from Ediacaran to Recent, and almost… …   Wikipedia

• Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… …   Wikipedia