-
Ultramafic rocks (also
referred to as
ultrabasic rocks,
although the
terms are not
wholly equivalent) are
igneous and meta-igneous
rocks with a very low...
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chemical types based on
silica content: felsic, intermediate, mafic, and
ultramafic.
Felsic or
silicic lavas have a
silica content greater than 63%. They...
- on the Mohs
scale of 5.5.
Chromite minerals are
mainly found in mafic-
ultramafic igneous intrusions and are also
sometimes found in
metamorphic rocks....
-
dioxide is such a
common component of
metamorphic fluids, talc-carbonated
ultramafics are
relatively common. However, the
degree of talc-carbonation is usually...
- melt. Ideally, the
stratigraphic sequence of an
ultramafic-mafic
intrusive complex consists of
ultramafic peridotites and
pyroxenites with ****ociated chromitite...
- of
ferromagnesian minerals, such as
olivine and pyroxene, in
mafic and
ultramafic rock to
produce serpentinite.
Minerals formed by
serpentinization include...
- analcite, prehnite, natrolite, scolecite, chabazite, heulandite, etc.
Ultramafic tuffs are
extremely rare;
their characteristic is the
abundance of olivine...
-
Skaergaard intrusion.
Notable rock
provinces (metamorphic
igneous rocks,
ultramafics, and anorthosites) are
found on the
southwest coast at Qeqertarsuatsiaat...
- zones; stratigraphy;
magmatism and
igneous rocks;
ophiolite series and
ultramafic rocks; and
orogenic events in Iran.
Considering geological and structural...
-
intruded these metamorphic rocks, and also
intrusive Early Paleoproterozoic ultramafic rocks. The term
Zoroaster Plutonic Complex is used for all Paleoproterozoic...
