The volcanic equivalent of granodiorite is which rock?

The volcanic equivalent of granodiorite is which rock?

• A. Rhyolite
• B. Andesite
• C. Dacite
• D. Basalt

Answer: (C)

Granodiorite is an intermediate felsic intrusive rock, with abundant plagioclase and quartz. When magma with that same composition erupts and crystallizes at the surface, the resulting volcanic rock keeps a similar mineral makeup but becomes fine-grained. That volcanic rock is dacite. Dacite sits in the intermediate to felsic range with quartz and plagioclase and a silica content similar to granodiorite, making it the appropriate surface counterpart. The other options correspond to different intrusive-extrusive pairs: rhyolite pairs with granite, andesite with diorite, and basalt with gabbro.

Granodiorite is an intermediate felsic intrusive rock, with abundant plagioclase and quartz. When magma with that same composition erupts and crystallizes at the surface, the resulting volcanic rock keeps a similar mineral makeup but becomes fine-grained. That volcanic rock is dacite. Dacite sits in the intermediate to felsic range with quartz and plagioclase and a silica content similar to granodiorite, making it the appropriate surface counterpart. The other options correspond to different intrusive-extrusive pairs: rhyolite pairs with granite, andesite with diorite, and basalt with gabbro.