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
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)
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 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
Expert Solution
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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