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Article Dans Une Revue Nature Année : 1994

Sulphur output and magma degassing budget of Stromboli volcano

Résumé

STROMBOLI volcano in the Aeolian islands has been erupting continuously for more than 2,000 years1, and probably as many as 5,000, following a major flank collapse2,3. Here we describe air-borne measurements of the plume flux of SO2 during 1980–93, which show that the volcano emits very large amounts of gas, mostly by open-conduit degassing between explosive outbursts, while exuding little basalt. Microprobe analysis of sulphur in the K-rich (shoshonitic) basalt, along with data for primitive basalts in the region4,5, suggests that the time-averaged SO2 flux is produced by intrusive degassing of 0.01-0.02 km3 yr-1 of magma, 100-200 times more than the volume erupted. Over 5,000 years, this rate implies that 50-100 km3 of intruded basalt would have been degassed, suggesting either that the volcanic pile has grown substantially by intrusion6 or, more probably, that a large magma storage system is emplaced at a shallow level within the crustal basement. Our results indicate that Etna and Stromboli alone provide 10% of the global budget of volcanic SO2.

Dates et versions

hal-03587271 , version 1 (24-02-2022)

Identifiants

Citer

P. Allard, J. Carbonnelle, N. Métrich, H. Loyer, P. Zettwoog. Sulphur output and magma degassing budget of Stromboli volcano. Nature, 1994, 368 (6469), pp.326-330. ⟨10.1038/368326a0⟩. ⟨hal-03587271⟩
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