Estimate the Percentage of Mafic Minerals Activity 5.5 Name: Course/Section Date

Question

Estimate the Percentage of Mafic Minerals Activity 5.5 Name: Course/Section Date: felsic (granite, rhyolite) intermediate (diorite, andesite) mafic (basalt, gabbro) ultramafic (peridotite, etc.) 15% 45% 85% 5% 30% 60% 95% Figure A5.5.1 The mafic minerals in photo A are shown as black areas in map B. Use the scale above to estimate the percentage of mafic minerals in this rock mafic % Based on your estimate, describe this rock as felsic, intermediate, mafic, or ultramafic. Now do the same analysis for the three rocks shown below mafic 96: rock description mafic 96: rock description mafic %: rock description Figure A5.5.2 143

Explanation / Answer

A. The mafic mineral in the photo A are shown as black areas in map B. Use the scale above to estimate the percentage of mafic minerals in the rock. Mafic% is less than 15% .

Based on mafic minerals the rock is felsic

B. The mafic mineral in the photo c are shown as black areas. Use the scale above to estimate the percentage of mafic minerals in the rock. Mafic% is nearly about 85% or varies from 60% to 85% .

Based on mafic minerals the rock is Mafic.

C. The mafic mineral in the photo A are shown as black areas. Use the scale above to estimate the percentage of mafic minerals in the rock. Mafic% is 15% to 30% .

Based on mafic minerals the rock is intermediate.

D. The mafic mineral in the photo A are shown as black areas. Use the scale above to estimate the percentage of mafic minerals in the rock. Mafic% is above 90% .

Based on mafic minerals the rock is ultramafic.

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