Publication Date:
2017-04-04
Description:
Recent geological studies performed at Etna allow reassessing
the stratigraphic frame of the volcano where distinct evolutionary
phases are defined. This stratigraphic reconstruction
was chronologically constrained on the basis of a limited
number of U–Th and K–Ar age determinations whose uncertainty
margins are sometimes too wide. For this reason, we
successfully adopted at Etna the 40Ar/39Ar technique that
allowed obtaining more precise age determinations. The
incremental heating technique also gives information on
sample homogeneity, and potential problems of trapped argon.
Five samples were collected from stratigraphically well-controlled
volcanic units in order to chronologically define the
transition between the fissure-type volcanism of the Timpe
phase to the central volcanism of the Valle del Bove Centers.
Isotopic ages with an uncertainty margin of 2–4% have been
obtained emphasizing that this transition occurred (130–
126 ka) without significant temporal hiatus.
Description:
University of Catania grants (COFIN-
2002, resp. F. Lentini); CNR-IDPA and
INGV-Sezione di Catania grants.
Description:
Published
Description:
292-298
Description:
3.5. Geologia e storia dei sistemi vulcanici
Description:
JCR Journal
Description:
reserved
Keywords:
40Ar/39Ar dating
;
Etna
;
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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