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- W2922245736 abstract "The U deposits of Novazza and Val Vedello are located in the Permian basin of Collio Orobico, close to the unconformity with the South-Alpine basement. The ignimbrites adjacent to the Novazza deposit have undergone a pervasive hydrothermal alteration. For this deposit, the study of the micas provides crystallization temperatures ranging from 540 °C to 350 °C. These micas do not show a zonal distribution with respect to the mineralized bodies. In the neighbouring barren basin of Collio Trumplino, the mica crystallization temperatures at 200 °C suggest a post-magmatic evolution very different from that of Novazza. The U-Pb data on zircons were made for ignimbrites collected in the Novazza mine and in the barren basin. They allow to propose a multi-episodic evolution model taking into account a mixing of two populations of zircons : a small amount of Precambrian zircons located in basement xenoliths within the ignimbrites, and a large proportion of zircons having crystallized in the ignimbrites, which are supposed to have been emplaced about 280 My ago. The U-Pb data of the Novazza and Val Vedello U-mineralizations suggest a phase of U concentration, during Cretaceous times. For each deposit, this age does not seem to be related to the ages of fault motions. Different hypothesis concerning the genesis of Novazza and Val Vedello deposits are discussed which take into account the paleotemperature data on micas, the ore paragenesis and the U-Pb data obtained on U-mineralizations." @default.
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- W2922245736 date "1987-01-01" @default.
- W2922245736 modified "2023-09-26" @default.
- W2922245736 title "Données minéralogiques et isotopiques sur deux gîtes hydrothermaux uranifères du bassin volcano-sédimentaire permien de Collio Orobico (Alpes Bergamasques) : mise en évidence d'une phase de remobilisation crétacée" @default.
- W2922245736 doi "https://doi.org/10.3406/bulmi.1987.7986" @default.
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