Pyroclast loss or retention during explosive volcanism on asteroids: Influence of asteroid size and gas content of melt

Details Pyroclast loss or retention during explosive volcanism on asteroids: Influence of asteroid size and gas content of melt Pyroclast loss or retention during explosive volcanism on asteroids: Influence of asteroid size and gas content of melt

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010m%26ps...45.1284w&link_type=abstract

Meteoritics and Planetary Science, Volume 45, Issue 8, pp. 1284-1301.

Computer Science

4

Scientific paper

We review the conditions under which explosive volcanism took place on early-forming differentiated asteroids. The pressure-dependent solubility of typical asteroid volatiles in melts implies that the gas driving explosive volcanism on asteroids less than approximately 100km in diameter was probably present mainly as a free phase capable of accumulating into large gas bodies and, thus, causing slug flow in melts approaching the surface. In contrast, in asteroids larger than approximately 100km the gas was probably present largely as a dispersion of small bubbles. We show that these gas distributions have implications for the size distribution of the pyroclastic droplets produced in explosive eruptions at the surface. All pyroclastic melt droplets are accelerated by the expanding gases, but their speeds lag the gas speed by a finite amount that is a function of the droplet size and density and the asteroid size and, hence, acceleration due to gravity. We compute pyroclast speeds and, by comparing them with escape velocities, we identify the critical pyroclast diameter on a given-size asteroid that distinguishes droplets lost to space from droplets that return to the surface. Identification of asteroidal pyroclasts and measurements of their sizes could throw light on the amounts of gas driving eruptions.

Affiliated with

Also associated with

No associations

Rating

Pyroclast loss or retention during explosive volcanism on asteroids: Influence of asteroid size and gas content of melt does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Pyroclast loss or retention during explosive volcanism on asteroids: Influence of asteroid size and gas content of melt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pyroclast loss or retention during explosive volcanism on asteroids: Influence of asteroid size and gas content of melt will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-983353