These rock types include iron-rich diorite, gabbro, and norite; leucocratic mafic rocks such as leucotroctolite and leuconorite; and iron-rich felsic rocks, including monzonite and rapakivi granite.
32.
Oceanic crust, on the otherhand, is made from mafic rock, basalt, which is made of amphiboles and pyroxenes, which crystallize earlier in the Bowens reaction series.
33.
Nickel is a chalcophile element which prefers sulfides, so an ultramafic or mafic rock which has a sulfide phase in the magma may form nickel sulfides.
34.
A few dikes of gabbro and other mafic rock from the Jurassic Period, 210 to 145 million years ago, are present in Pendleton and surrounding counties.
35.
Abstract mafic rocks at Lake Nipigon give evidence of rift-related continental basaltic magmatism during the Midcontinent Rift System event, estimated at 1, 109 million years ago.
36.
The process of forming " nickel laterite " deposits is essentially similar to the formation of gold laterite deposits, except that ultramafic or mafic rocks are required.
37.
By contrast, more mafic rocks, such as tonalite, gabbro and diorite, have 1 to 5 ppm uranium, and limestones and sedimentary rocks usually have equally low amounts.
38.
Samarium is accommodated more easily into mafic minerals, so a mafic rock which crystallises mafic minerals will concentrate neodymium in the melt phase faster relative to samarium.
39.
Mafic rocks are associated with strike-slip faults and normal shoshonitic ( both 25 and 21 m ) to andesitic ( post-Miocene ) lavas are found in the southern Altiplano.
40.
It tends to grow in wet habitats, such as on river bluffs, river bottoms, and flatwoods, and generally over basic substrates, such as mafic rocks, shells, or calcareous sediment.
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