mafic dykes

См. также в других словарях:

• 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

• Great Dyke — The Great Dyke is a linear geological feature that trends nearly north south through the center of Zimbabwe passing just to the west of the capital, Harare. It consists of a band of short, narrow ridges and hills spanning for approximately… …   Wikipedia

• Upper Rhine Graben — in western Germany.Formation to the north of the Alps [Sengor, A.M.C. 1976. Collision of irregular continental margins: Implications for foreland deformation of Alpine type orogens. Geology, 4, 779 782.] . The result was substantial crustal… …   Wikipedia

• Gerhard Spaeth — (* 14. Dezember 1930 in Dankmarshausen) ist ein deutscher Geologe und Polarforscher. Inhaltsverzeichnis 1 Wissenschaftlicher Werdegang 2 Antarktisforschung 3 Quellen …   Deutsch 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

• Pilbara craton — The Pilbara craton (the Pilbara province in northwest Western Australia), along with the Kaapvaal craton (the Kaapvaal province of South Africa) are the only remaining areas of pristine Archaean 3.6 2.7 Ga crust on Earth. Similarities of their… …   Wikipedia

• Large igneous province — Only a few of the largest Large Igneous Provinces are indicated (by the dark purple areas) on this geological map, which depicts crustal geologic provinces as seen in seismic refraction data. A Large Igneous Province (LIP) is an extremely large… …   Wikipedia

• Anorthosite — (pronEng|æˈnɔrθəsaɪt/, /ə ) is a phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90–100%), and a minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most… …   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

• Ultramafic rock — Ultramafic (also referred to as ultrabasic) rocks are igneous and meta igneous rocks with very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark… …   Wikipedia

• Narryer Gneiss Terrane — Stratigraphic range: > 3.3 Ga Satellite image of Jack Hills in the Narryer Gneiss Terrane Type Geological complex Sub units …   Wikipedia