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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
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Rahul kumar Best Answer
Answer: Hornblende Granite Given, Qtz= 20%, Plg= 20%, Orthoclase= 30%, Hbl= 10%, Others= 10% For IUGS classification of plutonic rocks, we have to Normalise Q (Quartz), A (Alkali feldspar), P (plagioclase) to 100%. After normalisation, the modal percentage of Q,A and P are; Q= (20/70) × 100 = 28.57% A= (30/70) × 100 = 42.85% P= (20/70) × 100 = 28.57% On IUGS classification Diagram of plutonic igneous rocks (QAPF Diagram), this modal composition will lie in the zone of Granite. So, according to the IUGS classification, this rock should be classified as Granite. Also, looking at the high modal percentage of Hornblende in the rock, the more precise name for this rock will be Hornblende Granite.
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Owishi Sarkar![best-answer]()
The answer is Hornblende Granite according to IUGS classification. Refer to the images given below.