Wiktionary
n. (context geology English) A cone-shaped volcanic vent produced by the explosion of gas-filled magma.
Wikipedia
A diatreme, sometimes known as a maar-diatreme volcano, is a volcanic pipe formed by a gaseous explosion. When magma rises up through a crack in the Earth's crust and makes contact with a shallow body of ground water, rapid expansion of heated water vapor and volcanic gases can cause a series of explosions. A relatively shallow crater is left (known as a maar) and a rock filled fracture (the actual diatreme) in the Earth's crust. Diatremes breach the Earth's surface and produce a steep inverted cone shape.
The term diatreme has been applied more generally to any concave body of broken rock formed by explosive or hydrostatic forces, whether or not it is related to volcanism.
Usage examples of "diatreme".
Jack and the rest of them used those gonzo hats in creativity mode to chill the diatreme on Callie.
After the grief this world's had coping wi' the diatreme, we've unco' need for a celebration.
There was already grumbling that the Milieu and the Old World weren't doing enough to help the diatreme refugees, and politicians were exploiting the situation both on Caledonia and in the European Intendancy back on Earth.
It's as though the diatreme blew away your good sense, for I swear I don't understand what's come over you since then.
Did you deepscan the thing when he lent it to you for good luck during the diatreme event?
Their decision to marry had been sudden, a notable shock to their relatives and associates, arrived at back on Caledonia in the aftermath of the diatreme eruption.
Nothing as spectacular as the Caledonian diatreme, thank God, but enough all-around crustal instability to keep us hopping.
Think of your own world in the aftermath of the diatreme disaster, with unexpected acts of bravery and compassion commonplace among the people.
It was done without his being aware of it, by the cockpit black box in the deep-driller that he used during the Caledonian diatreme event.
We've even had a kimberlite diatreme for the first time in thirty thousand orbits.
Millions of years ago, there was another, much smaller diatreme on this site.
Only when the diatreme began its ascent would we know for certain whether or not the operation had been a success.
The drill-rig carrying Jack and Doroth ée, together with the four other machines, withdrew to a safe distance from the ascending diatreme and then headed for the top.
Closer to the surface, its heat almost entirely dissipated, the rising diatreme just pulverized whatever got in its way.