Where did Archean rocks form and what is their nature? Most Archean rocks occur
ID: 290635 • Letter: W
Question
Where did Archean rocks form and what is their nature?
Most Archean rocks occur in bluestone belts, consisting largely of metamorphosed, dark, volcanic rocks.
Most Archean rocks occur in greenstone belts, consisting largely of metamorphosed, dark, volcanic rocks.
Most Archean rocks occur in greenstone belts, consisting largely of felsic, granitic rocks in ancient mountain belts.
Most Archean rocks occur in greenstone belts, consisting largely of weathered, light, volcanic rocks.
When and why did large continents begin to form?
Large continental landmasses formed in late Archean time only after Earth's radioactive furnace increased its heat production rate and the number of subduction zones increased.
Large continental landmasses formed in late Archean time only after Earth's radioactive furnace increased its heat production rate and the number of rift zones declined markedly.
Large continental landmasses formed in late Archean time only after Earth's radioactive furnace increased its heat production rate and the number of rift zones increased markedly.
Large continental landmasses formed in late Archean time only after Earth's radioactive furnace reduced its heat production rate and the number of rift zones declined markedly.
Most Archean rocks occur in bluestone belts, consisting largely of metamorphosed, dark, volcanic rocks.
Most Archean rocks occur in greenstone belts, consisting largely of metamorphosed, dark, volcanic rocks.
Most Archean rocks occur in greenstone belts, consisting largely of felsic, granitic rocks in ancient mountain belts.
Most Archean rocks occur in greenstone belts, consisting largely of weathered, light, volcanic rocks.
Explanation / Answer
before answer this question let me tell you that greenstone belt is characterize by the green color which is index by three minerals chlorite, actinolite and other amphibolite.
answer 1: Most Archean rocks occur in greenstone belts, consisting largely of metamorphosed, dark, volcanic rocks.
answer 2:Large continental landmasses formed in late Archean time only after Earth's radioactive furnace increased its heat production rate and the number of subduction zones increased.
some previous studies, propose that it is the actual melting of the subducting oceanic crust that is the 'key to produce continental crust so there must be some high heat producing event which melt the oceanic crust( high radioactive heat) and rebuild continental crust
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