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40 Ar/ 39 Ar geochronological method is applied to date both emplacement and subsequent very low-grade metamorphism of a thick lava series, the Veta Negra Formation from the Cordón de Chacana area, in the Coastal Range of central Chile. On the same lava series, and even on the same rock sample, it was possible to measure apparently valid ages of both the emplacement of lava flows (by dating...
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