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Les zircons des granites océaniques et continentaux: Couplage typologie-géochimie des éléments en traces
Pupin, J.-P. (1992). Les zircons des granites océaniques et continentaux: Couplage typologie-géochimie des éléments en traces. Bull. Soc. Géol. Fr. 163(4): 495-507
In: Bulletin de la Société Géologique de France. Société Géologique de France: Paris. ISSN 0037-9409, more
Peer reviewed article  

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Keywords
    Continental crust; Earth mantle; Geochemical cycle; Granite; Oceanic crust; Petrology; Trace elements; Zircon; Marine

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  • Pupin, J.-P.

Abstract
    The coupling of zircon typology together with the distribution of trace elements contents (Hf, Y, Th, U) in crystals, determined after ponctual electron microprobe analyses (and observations with cathodoluminescence), constitutes a fundamental key for the understanding of granitic magma history: source material and protolitic composition, contaminations at different periods of the magmatic stage, role of late fluid phases. Chemical composition of zircon crystals changes as a function of the mantle, hybrid or crustal origin of granitic rocks (oceanic or continental). Oceanic tholeiitic differentiates have specific zircons with low HfO2 (mainly <1%) and high Y contents. In the same way, but less marked, zircon populations from calc-alkaline rocks have early magmatic crystals with low HfO2 (<1.2%) and sometimes high Y contents, systematically absent in crustal rocks (out of inherited nuclei).

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