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Archaean domes and basins pattern. |
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Archaean crustal architecture in most Archaean cratons consists in granitic domes and synformal greenstone basins. This domes and basins architecture is interpreted in terms of either two phases of folding with orthogonal axis, or as the result of gravitational instabilities related to the density inversion following the emplacement of dense greenstone cover over a less dense felsic basement (personally this is my favourite explanation). These three structural maps illustrate domes and basins structure in three Archaean cratons. |
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| Murchison province (Yilgarn Craton, WA). |
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Dharwar craton (South India). |
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Eastern Pilbara (WA). |
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