-
Trachyandesite is an
extrusive igneous rock with a
composition between trachyte and andesite. It has
little or no free quartz, but is
dominated by sodic...
- is
intermediate in
composition between basalt and
andesite Basaltic trachyandesite –
Naming system for
volcanic rocksPages displaying short descriptions...
- Trachybasalt. S2 (Basaltic
trachyandesite)—*Sodic and pot****ic
variants are
Mugearite and Shoshonite. S3 (
Trachyandesite—*Sodic and pot****ic variants...
- basalt-trachybasalt-
trachyandesite volcanoes (Ngorongoro also
contains trachydacite) and the 1.6-1.5 Ma
Oldeani basalt-
trachyandesite volcano. The highlands...
-
example in the
intrusive dioritic pluton of El Teniente,
Chile and in
trachyandesite pumice erupted by El Chichón volcano, Mexico. The name
anhydrite was...
- rock. More specifically, it is a pot****ium-rich
variety of
basaltic trachyandesite,
composed of olivine,
augite and
plagioclase phenocrysts in a groundm****...
- as
plagioclase basalt, but now
reclassified from
basaltic trachyandesite to
trachyandesite. The
third phase, from 2.75 to 2.52
million years ago, completed...
-
descended over
steep slopes.
Tambora has
produced trachybasalt and
trachyandesite rocks which are rich in pot****ium. The
volcanics contain phenocrysts...
- fields, such as the
trachyandesite field, are
further classified by the
ratio of pot****ium to
sodium (so that pot****ic
trachyandesites are
latites and sodic...
-
trachyandesite was
interpreted as lacustrine,
likely the
result of
ponding against the
volcanic flows. The high
relative abundance of
trachyandesite and...
