7. Compare the photomicrographs of sandstones in Figure 3.8 A and Figure 3.8 B.

Question

7. Compare the photomicrographs of sandstones in Figure 3.8 A and Figure 3.8 B. Which sandstone is more texturally mature? Which one is more compositionally mature?
8. Compare the photomicrographs of sandstones in Figure 3.8 A and Figure 3.8 C. Which sandstone is more texturally mature? Which one is more compositionally mature? 7. Compare the photomicrographs of sandstones in Figure 3.8 A and Figure 3.8 B. Which sandstone is more texturally mature? Which one is more compositionally mature?
8. Compare the photomicrographs of sandstones in Figure 3.8 A and Figure 3.8 C. Which sandstone is more texturally mature? Which one is more compositionally mature? 7. Compare the photomicrographs of sandstones in Figure 3.8 A and Figure 3.8 B. Which sandstone is more texturally mature? Which one is more compositionally mature?
8. Compare the photomicrographs of sandstones in Figure 3.8 A and Figure 3.8 C. Which sandstone is more texturally mature? Which one is more compositionally mature?

Explanation / Answer

The ratio of quartz to other components (feldspar and lithic fragments combined) is an index of compositional maturity. If a rock contains a low proportion of quartz and a higher proportion of softer, unstable elements, it an immature rock. If the sample contains a high proportion of resistant, stable quartz compared to the unstable elements it is a more mature rock.

In terms of textural maturity, a rock is immature when it contains angular, poorly sorted grains, and it is mature when it contains rounded, well-sorted grains

Using the above definitions

7) texturally stable : 3.8 B)

Compositionally stable : 3.8 B)

8)texturally stable : 3.8 A)

Compositionally stable 3.8A)

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