Based upon emplacement models for diatremes it can be inferred that the diatreme that forms Rutan Hill is the throat of an ancient, extinct volcano.
12.
This diatreme contains a small plug-like body of nepheline syenite that is about in diameter and is choked with variety of angular to subangular xenoliths and autoliths.
13.
The "'Cross diatreme "'is a diatreme in southeastern British Columbia, Canada, located east of the Rocky Mountain Trench and northeast of Elkford.
14.
The "'Cross diatreme "'is a diatreme in southeastern British Columbia, Canada, located east of the Rocky Mountain Trench and northeast of Elkford.
15.
These differing facies are associated with a particular style of magmatic activity, namely crater, diatreme and hypabyssal rocks ( Clement and Skinner 1985, and Clement, 1982 ).
16.
The maars result from explosive interaction of the hot diatreme material with the groundwater system and result in a mixture of volcanic tuff material and sediments of the Miocene Pliocene lacustrine sediments of the Bidahochi Formation.
17.
It is the eroded remnant of what was an active volcano or diatreme that last erupted approximately 35 million years ago, making it one of the youngest volcanos on the east coast of North America.
18.
Its low rim is composed of loose pieces of basaltic lava and wall rocks ( sandstone, shale, limestone ) of the underlying diatreme, as well as random chunks of ancient crystalline rocks blasted upward from great depths.
19.
For instance, the Sullivan orebody in south-eastern British Columbia was developed within an interformational diatreme, caused by overpressuring of a lower sedimentary unit and eruption of the fluids through another unit en route to the seafloor.
20.
The "'HP diatreme "', also called the "'HP pipe "', is a diatreme in the Rocky Mountains of southeastern British Columbia, Canada, located northeast of Golden.