-
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...
-
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...
- of
three ultramafic breccia diatremes in
southeastern British Columbia Cross,
Blackfoot and HP* (82J, 82G, 82N)
Diatreme breccias In
British Columbia...
-
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...
- cones, stratovolcanoes,
shield volcanoes,
submarine volcanoes, calderas,
diatremes, and maars,
along with less
common volcanic forms such as
tuyas and subglacial...
- is in two
diatreme breccias,
named the Peñasco and the
Brecha Azul. The
mineralization contains gold, silver, lead and zinc. The
diatremes flare upward...
-
unusual igneous rock
called minette. It is one of many such
volcanic diatremes that are
found in
Navajo country of
northeast Arizona and
northwest New...
-
volcanoes in
Canada "Comparative
mineralogy of
three ultramafic breccia diatremes in
southeastern British Columbia Cross,
Blackfoot and HP* (82J, 82G, 82N)"...