A pyroclastic flow deposit on Venus

Ghail, Richard and Wilson, Lionel (2014) A pyroclastic flow deposit on Venus. In: Volcanism and tectonism across the inner solar system. Geological Society Special Publication . Geological Society, London, pp. 97-106. ISBN 9781862396326

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Abstract

Explosive volcanism on Venus is severely inhibited by its high atmospheric pressure and lack of water. This paper shows that a deposit located near 16°S, 144°E, here referred to as Scathach Fluctus, displays a number of morphological characteristics consistent with a pyroclastic flow deposit. These characteristics, particularly its lack of channelisation and evidence for momentum rather than cooling limited flow length, contrast with fissure-fed lava flow deposits. The total erupted volume is estimated to have been between 225 km3 and 875 km3 but this may have been emplaced in more than one event. Interaction between Scathach Fluctus and a small volcanic cone constrain the flow velocity to 48 m s−1 and plausible volatile concentrations to at least 1·8 wt% H2O, 4·3 wt% CO2 or 6·1 wt% SO2, the latter two implying magma sourced directly from the mantle. The deposit has radar characteristics, particularly an exponential backscatter function, that are similar to those of nearly half the planetary surface, implying that pyroclastic deposits may be much more common on Venus than has been recognised to date, and suggesting both a relatively volatile-rich mantle and a volcanic source for atmospheric SO2.

Item Type:
Contribution in Book/Report/Proceedings
ID Code:
70317
Deposited By:
Deposited On:
13 Aug 2014 09:29
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 05:47