metamorphic overprint

metamorphic overprint

[¦med·ə¦mȯr·fik ′ō·vər‚print]
(geochemistry)
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The presence of sillimanite is important as it reflects a high grade metamorphic overprint has occurred.
Romer & Wright (1992) investigated one columbite sample in the contact aureole of a Paleoproterozoic granite that was subjected to a Caledonian upper greenschist to lower amphibolite facies regional metamorphic overprint and this columbite displayed only partial resetting during Caledonian metamorphism.
Overburden Drilling Management Limited (ODM) of Ottawa, Ontario during the 1996 field season discovered that the area is actually underlain by prospective Superior Province volcanic and sedimentary rocks with a metamorphic overprint and, the magnetic anomaly is due to a profusion of Iron Formation and komatiite horizons.