Starting from the basic mineralogical/chemical composition of a gabbro, what type of rock would have been generated with a decrease in silica (SiO2) and an increase in iron, calcium and magnesium? 1. andesite     2. komatiite     3. gabbro      4. peridotite

Applications and Investigations in Earth Science (9th Edition)
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ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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Chapter1: The Study Of Minerals
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Starting from the basic mineralogical/chemical composition of a gabbro, what type of rock would have been generated with a decrease in silica (SiO2) and an increase in iron, calcium and magnesium?
1. andesite     2. komatiite     3. gabbro      4. peridotite

 

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Step 1: introduction

Gabbro is an intrusive igneous rock with a mafic composition, characterized by relatively low silica (SiO2) content and higher amounts of iron (Fe), calcium (Ca), and magnesium (Mg). When you decrease the silica content and increase iron, calcium, and magnesium, you are moving towards a more ultramafic composition, as opposed to the mafic composition of gabbro.


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