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- W2023480493 abstract "The Andringitra Range (Madagascar) is made of potassic to ultrapotassic syenites (K2O=8–11 weight%; K2O/Na2O=2–8). It is a new example of this rare type of magmatism, here related to the Late Precambrian Panafrican orogeny. In the Pic Boby area, the main rock type contains pyroxene (diopside) and amphibole (edenite), and is nearly silica-saturated. A subordinate type is an undersaturated diopside- and phlogopite-bearing syenite. Very high K, Ba, Rb, Sr and LREE contents, together with moderate to high Mg# (33–54), suggest a parental magma derived from the enriched (metasomatized) lithospheric mantle. Fractional crystallisation and crustal assimilation may be responsible for the most evolved compositions. Le massif de l'Andringitra (Madagascar) est formé de syénites potassiques à ultrapotassiques (K2O=8–11 % en poids ; K2O/Na2O=2–8). Il constitue un nouvel exemple de ce type de magmatisme rare, ici lié à un contexte orogénique, en l'occurrence l'orogenèse panafricaine de la fin du Précambrien. Dans la région du pic Boby, le type pétrographique dominant est une syénite à pyroxène (diopside) et amphibole (édénite), proche de la saturation en silice. Un deuxième type de syénite, sous-saturé, renferme diopside et phlogopite. Les teneurs très importantes en K, Ba, Rb, Sr et terres rares légères, associées à un Mg# (100 Mg/[Mg+Fe]) assez élevé (33–54), indiquent un magma parent issu d'un manteau lithosphérique enrichi en éléments incompatibles sous l'effet de fluides métasomatiques. Cristallisation fractionnée et assimilation crustale peuvent rendre compte des compositions les plus évoluées." @default.
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- W2023480493 date "2001-06-01" @default.
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- W2023480493 title "Un nouvel exemple de magmatisme potassique à ultrapotassique : les syénites de l'Andringitra (Madagascar)" @default.
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- W2023480493 doi "https://doi.org/10.1016/s1251-8050(01)01599-3" @default.
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