origin of continental crust
Answers
Answer:
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Explanation:
as with oceanic crust, continental crust is created by plate tectonics. At convergent plate boundaries, where tectonic plates crash into each other, continental crust is thrust up in the process of orogeny, or mountain-building.
Recent data have documented the importance of Si, Na, K, O, and H derived from the lower layers of the mantle, along Benioff zones. In the Tethys and circum-Pacific volcanic zones, continental layers have formed from the generation of juvenile granite and eruptions of intermediate and acidic lava. Numerous data contradict the contention that andesitic and rhyolitic magma are differentiates of basaltic magma; the downsliding and assimilation of basaltic oceanic crust do not account for the bulk of the continental granitic and andesitic crust. Lighter materials have ascended from the deep layers of the mantle, and these compose the main masses of continental crust.
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