Late Proterozoic caldera complex in Saudi Arabia
The Salma caldera is a late Proterozoic caldera complex in the northeastern Arabian Shield of Saudi Arabia. It encompasses rhyolitic volcanic rocks, a peralkaline ring intrusion that rose along a fracture formed during caldera collapse, and a younger resurgent metaluminous and peraluminous granite core.[1]
References
This article incorporates public domain material from websites or documents of the United States Geological Survey.