17 Questions
What is the type of rock generally produced at oceanic divergent plate boundaries?
Basaltic rocks
Where are hotspots most likely to occur?
Intraplate settings
Which type of rock is commonly formed at continental rifts?
Silicic rocks
What is the primary rock type associated with the Mid-Atlantic Ridge?
Peridotite rocks
What is the percentage estimate of basic (basaltic) melts generated at modern divergent plate boundaries?
62%
What type of rocks are typically found at convergent plate boundaries?
Granodiorite, diorite, gabbro, and tonalite
Which type of rocks are associated with the Columbia River basalts?
Alkalic rocks
What is the spectrum of possible volcanic rock types near convergent plate boundaries?
Quartz diorite, diorite, granite, andesites
What influences the melting behavior of mantle peridotite at convergent margins?
Composition (continental vs oceanic), fractionation processes
What type of rocks are referred to as trondhjemite near convergent margins?
Silicic rocks
What process lowers the melting temperature of mantle peridotite at convergent boundaries?
Flux melting releasing volatile vapors
What types of lava are erupted in the East African rift system?
Alkali basalt, phonolite, trachyte, rhyolite, and carbonatite
Which of the following ancient rifts is mentioned in the text?
Rhine Graben and Oslo Graben
What is the driving force behind the lithospheric extension that leads to the development of continental rifts?
Upwelling of hot plumes generated by the return convective loop of downgoing oceanic lithosphere
Where does bimodal volcanism occur according to the text?
Continental rifts and hotspots underlying lithosphere
What type of volcanism involves the occurrence of both basalt and rhyolite at continental rifts?
Bimodal volcanism
Which volcanic rocks are referred to as silicic rocks in the text?
Rhyolite
Explore the geological phenomenon of continental rifting, focusing on notable rift systems like the East African rift basin and the Rio Grande rift system. Learn about the diverse lava types associated with these rifts and uncover the driving forces behind lithospheric movement.
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