Ar-40/Ar-39 geochronology of Holocene basalts; examples from Stromboli, Italy
Por:
Wijbrans J., Schneider B., Kuiper K., Calvari S., Branca S., De Beni E., Norini G., Corsaro R.A., Miraglia L.
Publicada:
1 abr 2011
Resumen:
Absolute chronologies of active volcanoes and consequently timescales for eruptive behaviour and magma production form a quantitative basis for understanding the risk of volcanoes. Surprisingly, the youngest records in the geological timescale often prove to be the most elusive when it comes to isotopic dating. Absolute Holocene volcanic records almost exclusively rely on C-14 ages measured on fossil wood or other forms of biogenic carbon. However, on volcanic flanks, fossil carbon is often not preserved, and of uncertain origin when present in paleosols. Also, low C-14-volcanic CO2 may have mixed with atmospheric and soil C-14-CO2, potentially causing biased ages. Even when reliable data are available, it is important to have independent corroboration of inferred chronologies as can be obtained in principle using the K-40/Ar-40 decay system. Here we present results of a Ar-40/Ar-39 dating study of basaltic groundmass in the products from the Pleistocene - Holocene boundary until the b
Filiaciones:
Wijbrans J.:
Department of Earth Sciences, Faculty of Earth and Life Sciences, VU University de Boelelaan 1085, NL-1081HV, Amsterdam, Netherlands
Schneider B.:
Department of Earth Sciences, Faculty of Earth and Life Sciences, VU University de Boelelaan 1085, NL-1081HV, Amsterdam, Netherlands
Kuiper K.:
Department of Earth Sciences, Faculty of Earth and Life Sciences, VU University de Boelelaan 1085, NL-1081HV, Amsterdam, Netherlands
Calvari S.:
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Catania, Italy
Branca S.:
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Catania, Italy
De Beni E.:
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Catania, Italy
Norini G.:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Computat Geodynam Lab, Queretaro, Mexico
Corsaro R.A.:
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Catania, Italy
Miraglia L.:
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Catania, Italy
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