Starting from the basic mineralogical/chemical composition of a basalt, what type of rock would have been generated with an increase in silica (SiO2), sodium and potassium? 1. andesite - 2. komatiite - 3. gabbro - 4. peridotite
Starting from the basic mineralogical/chemical composition of a basalt, what type of rock would have been generated with an increase in silica (SiO2), sodium and potassium? 1. andesite - 2. komatiite - 3. gabbro - 4. peridotite
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Starting from the basic mineralogical/chemical composition of a basalt, what type of rock would have been generated with an increase in silica (SiO2), sodium and potassium?
1. andesite - 2. komatiite - 3. gabbro - 4. peridotite
Expert Solution
Step 1: introduction
A basalt is a type of igneous rock that is rich in iron (Fe) and magnesium (Mg) and has a low silica (SiO2) content. When you increase the silica content, sodium (Na), and potassium (K), you are essentially moving towards a more felsic composition, as opposed to the mafic composition of basalt. Felsic rocks have higher SiO2 and lower Fe and Mg content.
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