Recent hydrovolcanic deposits with evidence of magmatic immiscibility on Deception Island, Antarctica

Outcrops of hydro-volcanic deposits on Deception Island are stratigraphically re-classified. The sequence was assigned to a pre-caldera phase, but it has very different compositional and consolidation characteristics, enabling it to be differentiated and redefined as a new unit. In this paper, it is...

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Bibliographic Details
Main Authors: Caselli, A.T., Agusto, M.R.
Format: Journal/Newspaper
Language:unknown
Subjects:
Antarctica
Deception Island
Historical eruptions
Hydrovolcanism
immiscibility
magma
volcanic eruption
Arctic and Antarctic
South Shetland Islands
World
Antarc*
Antarctic
Arctic
Online Access:https://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p495_Caselli
Description
Summary:Outcrops of hydro-volcanic deposits on Deception Island are stratigraphically re-classified. The sequence was assigned to a pre-caldera phase, but it has very different compositional and consolidation characteristics, enabling it to be differentiated and redefined as a new unit. In this paper, it is stratigraphically relocated as a historical eruption, on the basis of its compositional similarity to ash-falls in Bransfield Basin. The studied deposits are bimodal (basaltic/rhyolitic) implying a relationship with magma immiscibility. The occurrence of more acidic periods would allow relatively more explosive vents with greater particle dispersion to take place. © 2004 Asociación Geológica Argentina.

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