-
become extrusions.
Examples of
diatremes include the
Blackfoot diatreme and
Cross diatreme in
British Columbia, Canada.
Diatremes are
sometimes ****ociated with...
-
nepheline syenite plutons; a
nearby diatreme (Rutan Hill); and
several other nearby and much
smaller ****s, sills, and
diatremes. The two
large nepheline syenite...
- at
intersections of ****s
where p****age of
magma is
least obstructed.
Diatremes and
breccia pipes are pipe-like
bodies of
breccia that are
formed by particular...
-
quartz crystals in a silica-deficient lava and
diamonds within kimberlite diatremes.
Xenoliths can be non-uniform
within individual locations, even in areas...
- The
Aristifats Diatreme is a
diatreme in the
Northwest Territories, Canada,
located about 100 km (62 mi) east of Yellowknife. It is
thought to have formed...
-
portion the more
deeply eroded feeder diatremes. The
maars result from
explosive interaction of the hot
diatreme material with the
groundwater system and...
- is in two
diatreme breccias,
named the Peñasco and the
Brecha Azul. The
mineralization contains gold, silver, lead and zinc. The
diatremes flare upward...
-
minerals and
depth of the
magma source, but on the
other hand
volcanic diatremes are common,
indeed the
second commonest form of
volcanic extrusion (that...
-
volcanoes in
Canada "Comparative
mineralogy of
three ultramafic breccia diatremes in
southeastern British Columbia Cross,
Blackfoot and HP* (82J, 82G, 82N)"...
- observed,
analogues are preserved. Most of
these rocks occur as ****s,
diatremes,
lopoliths or laccoliths, and very rarely, intrusions. Most kimberlite...
