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05-Nov-2016 02:44

There is extensive evidence from petrology, geochemistry and isotope data for variable contamination with continental crust, and the most plausible physical model involves deep-crustal ponding of basaltic magmas, crystallization and sinking of mafic silicates, and eventual flotation of buoyant plagioclase.

Massifs were constructed by the coalescence of plagioclase-rich mushes, which ascended to mid-crustal emplacement sites.

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The onset of massif-type anorthosite formation at ~ 2.6 Ga probably reflects global secular cooling of the Earth, resulting in increased lithospheric strength and crustal thickness, which promoted Moho-depth ponding and slow crystallization of basaltic magmas in continental arc environments.

The apparent disappearance of anorthosite massifs at ~ 0.5 Ga may also relate to global secular cooling that changed the thermal structure of subduction zones, and promoted the onset of high and ultra-high pressure metamorphism.

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