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Granite petrogenesis revealed by combined gravimetric and radiometric imaging

Tartèse, Romain; Boulvais, Philippe; Poujol, Marc and Vigneresse, Jean-Louis (2011). Granite petrogenesis revealed by combined gravimetric and radiometric imaging. Tectonophysics, 501(1-4) pp. 98–103.

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In peneplaned terranes, it is often impossible to get a full 3D view of geological objects. In the case of granitic plutons, for which intrusive relationships between constituent units can provide first order information regarding their petrogenesis, this lack of 3D field evidence is a major issue. Indirect observations can be provided by geophysical surveys. Here, we interpret field gravity data and airborne gamma ray radiometric maps with whole rock geochemistry data in order to obtain information on granite petrogenesis. First, we test our proposed combined geophysical and geochemical approach on the Huelgoat Variscan intrusion (Armorican Massif, France) and we show that ternary radiometric maps are a good proxy for the distribution of K, U and Th radioelements. Then, we apply our method to the Lizio and Questembert Variscan granitic intrusions (Armorican Massif) and show that some features characteristic of the intrusions, such as the feeding zones, can be localised by geophysical imaging. Indeed, radiometric maps constitute a frozen image of the latest stage of the magmatic building of plutons.

Item Type: Journal Article
Copyright Holders: 2011 Elsevier B.V.
ISSN: 0040-1951
Keywords: airborne gamma ray radiometry; geochemistry; granite petrogenesis; gravimetry
Academic Unit/Department: Science > Physical Sciences
Item ID: 31682
Depositing User: Romain Tartèse
Date Deposited: 30 Jan 2012 11:54
Last Modified: 18 Jan 2016 12:02
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