The model for early crustal evolution is based on the interactions of all of the following except..... A- accretion of island arcs B- greenstone belt formation C- Plutonism D- meteorite impact
Question
The model for early crustal evolution is based on the interactions of all of the following except..... A- accretion of island arcs B- greenstone belt formation C- Plutonism D- meteorite impact
Solution
The model for early crustal evolution is based on the interactions of:
A- Accretion of island arcs: This refers to the process of material being added to a tectonic plate or a landmass. This occurs wherever two tectonic plates collide and one is forced underneath the other.
B- Greenstone belt formation: Greenstone belts are zones of variably metamorphosed mafic to ultramafic volcanic sequences with associated sedimentary rocks that occur within Archaean and Proterozoic cratons between granite and gneiss bodies.
C- Plutonism: This refers to the geological processes associated with the formation of plutonic rocks, which are coarse-grained rocks crystallized from magma beneath the Earth's surface.
D- Meteorite impact: This refers to the collision of a meteorite with the Earth's surface.
Among these options, the one that is not typically associated with the model for early crustal evolution is D- Meteorite impact. While meteorite impacts have certainly occurred throughout Earth's history and have influenced its geology, they are not a primary factor in the model for early crustal evolution, which is more concerned with processes occurring within the Earth's crust and upper mantle.
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