-
Nephelinites are also ****ociated with
carbonatite in some occurrences,
consistent with
source rocks relatively rich in
carbon dioxide.
Nephelinite is...
-
intraplate hotspots.
Their silica content can
range from
ultramafic (
nephelinites,
basanites and tephrites) to
felsic (trachytes). They are more likely...
-
consisting mainly of
nephelinites or larnite-normative
nephelinites and
basanites along with
lesser olivine melilite nephelinites,
phonolites and tholeiitic...
-
feldspathoid classifies a rock as silica-undersaturated; an
example is
nephelinite.
Magmas are
further divided into
three series: The
tholeiitic series...
-
Mount Meru.
Mount Meru's
lavas are
alkaline in
character and
include nephelinite. Much of the mountain's
height was lost
about 7,800
years ago due to...
- melanite-garnet. This rock is the
plutonic and holo-crystalline
analogue of the
nephelinites -volcanic
equivalent and nepheline-dolerites; it
bears the same relation...
-
intraplate hotspots.
Their silica content can
range from
ultramafic (
nephelinites,
basanites and tephrites) to
felsic (trachytes). They are more likely...
-
igneous rock.
There is very
little co****r-grained
gabbro and diabase.
Nephelinite is
exposed on the
islands but is
extremely rare. The
majority of eruptions...
- feldspars. They
range from olivine-rich
melilitites through leucites to
nephelinites, containing, in
various proportions mainly the
minerals nepheline, leucite...
- tuffs. The
nephelinites are
classified into
three types based on petrography, mineralogy, and geochemistry:
strongly porphyritic nephelinite, wollastonite...
