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The two tectonic models postulated for greenstone belt evolution are..... A- intercontinental rift, back are basin B- Subduction, mid-ocean ridge C-continent/continent collision, intracontinental rift D- back-arc basin, continent/continent collision

Question

The two tectonic models postulated for greenstone belt evolution are..... A- intercontinental rift, back are basin B- Subduction, mid-ocean ridge C-continent/continent collision, intracontinental rift D- back-arc basin, continent/continent collision

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Solution

The two tectonic models postulated for greenstone belt evolution are:

  1. Subduction Zone Model: This model suggests that greenstone belts are analogous to modern-day island arc systems. In this model, the greenstone belts represent the remnants of ancient oceanic crust that was formed at mid-ocean ridges, then subducted and metamorphosed in subduction zones, and finally uplifted and exposed at the surface.

  2. Back-Arc Basin Model: This model proposes that greenstone belts are similar to modern-day back-arc basins. In this model, the greenstone belts represent the remnants of ancient oceanic crust that was formed in back-arc basins behind subduction zones, then uplifted and exposed at the surface.

So, the correct answer is B- Subduction, mid-ocean ridge and D- back-arc basin, continent/continent collision.

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