In-situ cosmogenic 3He exposure ages of pyroxene phenocrysts from basalts from the Upper Neostromboli formation in southwest Stromboli date its eruption at 7.0 0.3 ka (1s, n ¼ 3, Ginostra site) and 6.8 0.2 ka (1s, n ¼ 10, Timpone del Fuoco site) respectively. Correlation of our new data to previous K/ Ar and palaeomagnetic ages from the northwestern Neostromboli phase suggests that it erupted within a confined period between roughly 6 and 14 ka. The low uncertainty on the 3Hecos ages as well as on individual exposure ages (4.4–8.7%) demonstrates that 3Hecos exposure dating is a viable tool for dating Holocene basalt lavas. The ages compare favourably to uncertainties obtained for radiocarbon dating of similar rocks.
Dating Holocene lavas on Stromboli, Italy using cosmogenic He / J.P.T. FOEKEN; F.M. STUART; L. FRANCALANCI. - In: QUATERNARY GEOCHRONOLOGY. - ISSN 1871-1014. - STAMPA. - 6:(2009), pp. 517-524. [10.1016/j.quageo.2009.09.001]
Dating Holocene lavas on Stromboli, Italy using cosmogenic He
FRANCALANCI, LORELLA
2009
Abstract
In-situ cosmogenic 3He exposure ages of pyroxene phenocrysts from basalts from the Upper Neostromboli formation in southwest Stromboli date its eruption at 7.0 0.3 ka (1s, n ¼ 3, Ginostra site) and 6.8 0.2 ka (1s, n ¼ 10, Timpone del Fuoco site) respectively. Correlation of our new data to previous K/ Ar and palaeomagnetic ages from the northwestern Neostromboli phase suggests that it erupted within a confined period between roughly 6 and 14 ka. The low uncertainty on the 3Hecos ages as well as on individual exposure ages (4.4–8.7%) demonstrates that 3Hecos exposure dating is a viable tool for dating Holocene basalt lavas. The ages compare favourably to uncertainties obtained for radiocarbon dating of similar rocks.
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
