The rock mass and material characteristics of an igneous rock are greatly influenced by the chemistry...

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Civil Engineering

The rock mass and material characteristics of an igneous rockare greatly influenced by the chemistry of magma and the tectonicsettings in which they are formed. Based on the statement given,answer the following questions. a) Briefly explain the maindifference between the texture of volcanic and plutonic igneousrock? (3b) Discuss how silica content affects the chemistry ofmagma? c) Explain the difference between the typical rock masscharacteristics of plutonic and volcanic igneous rock? (d) Discussthe suitability of the following rock types in terms of theirpotential for Alkali Silica Reaction (ASR) when used as aggregatesin concrete mix. i) Granite ii)

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a Volcanic rocks have very fine crystals due to rapid cooling of magma This results in aphanitic texture Aphantic texture means glassy texture with no visible crystals Eg Basalt Plutonic rocks have large or coarse grained crystals due to slow cooling This results in phaneritic texture phaneritic texture means there are visible crystals Eg See Answer

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