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statuscvo [17]
3 years ago
10

Suppose you are on a hike when you find a dark-colored igneous rock (pictured below). the rock has very small crystals that can

only be seen under magnification. you bring the rock back to the lab and make a thin section of it so that you can examine its mineral composition using a petrographic microscope. in thin section, you are able to determine that the rock consists of plagioclase feldspar (mostly ca-rich) and several ferromagnesian minerals. what does this tell you about the rock's origin?
Geography
1 answer:
sveticcg [70]3 years ago
6 0

They are made of lighter elements, they tend to be more buoyant than mafic rocks, which are rocks high in magnesium and iron, like basalt.

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