mafic rock वाक्य
उदाहरण वाक्य
मोबाइल
- The highlands of the peninsula contain amphibolite and eclogite mafic rocks which, like tholeiitic metabasalt, are similar to the rocks found both on island arcs and on mid-ocean ridges.
- The name comes from the green hue imparted by the colour of the metamorphic minerals within the mafic rocks : the typical green minerals are chlorite, actinolite, and other green amphiboles.
- The Beaver Bay Complex occupies the center of the North Shore Volcanics, and is slightly younger in age than the other mafic rocks of the Duluth Complex, dating from c . 1096 mya.
- These felsic protocontinents ( cratons ) probably formed at hot spots from a variety of sources : mafic magma melting more felsic rocks, partial melting of mafic rock, and from the metamorphic alteration of felsic sedimentary rocks.
- Gabbro and diabase structures of the Duluth Complex trend generally from southwest to northeast, and the differential erosion has left a series of ridges comprising these harder mafic rocks rising from the softer sedimentary rocks of the Rove Formation.
- These characteristics include being composed of igneous mafic rock types with high percentages of olivine and pyroxene phenocrysts, having the individual boulders isolated from severe weathering by the formation of well-drained boulder fields, and having similar sounds and surface weathering.
- In the Troodos ophiolite it was observed from the variation in magma types, which can be seen to go from evolved to less evolved mafic rocks in localised cross cutting field relationships implying the presence of more than one magma chamber that cuts other exhausted ones.
- High-alumina basalts have aluminium contents of 17 19 wt % Al 2 O 3; boninites have magnesium contents of up to 15 percent MgO . Rare feldspathoid-rich mafic rocks, akin to alkali basalts, may have Na 2 O + K 2 O contents of 12 % or more.
- The mineral crocoite, occurring as orange-yellow prismatic crystals, is a moderately rare mineral known from the oxidation zones of such Pb ore beds, that were affected by chromate-bearing solutions, coming from the oxidation of primary Cr minerals ( chromite ) of the nearby ( ultra ) mafic rocks.
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