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- W2009487906 abstract "In the Monte Baldo area of the Southern Alps basalts have been deposited below fossiliferous neritic limestones. Large foraminifers gave a “Biarritziano” age to the limestones immediately overlying the basalts. These sediments are followed by a Priabonian sequence. Some of the basalts are rich enough in celadonite for this component to have been used by Roman artists as a cheap painting pigment. This celadonite gave several KAr apparent ages of ∼ 30 and 23.5 Ma, clearly younger than the time of deposition of the basalts. One basalt gave a KAr apparent age of 36.5 ± 2.0 Ma, significantly younger than a plagioclase, selected from a basalt of apparently similar stratigraphic location, measured at 40.4 ± 0.8 Ma. The age of ∼ 40 Ma is an indication of the maximum time of deposition of the sediments of “Biarritziano” age. Dans la région du Monte Baldo, Alpes méridionales, des basaltes sont interstratifiés dans des calcaires néritiques fossilifères. D'après les grands Foraminifères un âge “Biarritziano” a été attribué aux calcaires immédiatement sus-jacents aux basaltes. Ces calcaires sont eux-mêmes suivis d'une séquence priabonienne. Certains basaltes sont assez riches en céladonite pour avoir été exploités depuis les Romains comme pigment pictural bon marché. Cette céladonite a révélé des âges apparents KAr d'environ 30 et 23,5 Ma, nettement plus jeunes que le moment de mise en place des basaltes. Un échantillon de basalte a donné un âge apparent sur roche totale de 36,5 ± 2,0 Ma significativement plus jeune qu'un plagioclase, extrait d'un basalte réputé de même âge stratigraphique, qui a livré l'âge de 40,4 ± 0,8 Ma. Cet âge est un âge maximum pour le dépôt des sédiments sus-jacents attribués au “Biarritziano”." @default.
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- W2009487906 date "1986-01-01" @default.
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- W2009487906 title "Le volcanisme du “Biarritziano” de Vénétie (Italie): Ages KAr sur basalte, pasalte, plagioclase et céladonites" @default.
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- W2009487906 doi "https://doi.org/10.1016/0168-9622(86)90069-2" @default.
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