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Author Question: The arkose contains greater than 25 feldspar (both potassium and sodium-rich plagioclase feldspar) ... (Read 37 times)

CORALGRILL2014

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on: Jul 16, 2018
The arkose contains greater than 25 feldspar (both potassium and sodium-rich plagioclase feldspar) along with abundant quartz. What kind of igneous rock might have weathered to produce the sediment? Hint: Look back to Figure 4.3 in your textbook.
 
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Question 2

Geologists interpret a very warm climate for this region at this time. What evidence in the rocks supports this interpretation?
 
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Question 3

Consider what other minerals might be in this igneous rock other than the quartz and two feldspars. Why aren't these minerals also present in the arkose?
 
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daiying98

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Reply #1 on: Jul 16, 2018
Answer to Question 1

I appreciate you answering this question. This is a great community

Answer to Question 2

Posted another one can you check that one too? Thanks.

Answer to Question 3

The other minerals present in the granite are biotite and amphibole. Both of these are Fe-Mg rich minerals and they are not present in the arkose because they have been chemically weathered into clay and Fe-oxides (hence the reddish color of the arkose).


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