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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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volcanic rock Blairmorite – Rare
porphyritic volcanic rock Boninite –
Ultramafic extrusive rock high in both
magnesium and
silica Carbonatite – Igneous...
- ****ociations are noted: high-alumina basalts, ultrapot****ic
igneous rocks, and
ultramafic rocks. The
basaltic occurrence of
phlogopite is in ****ociation with picrite...
- analcite, prehnite, natrolite, scolecite, chabazite, heulandite, etc.
Ultramafic tuffs are
extremely rare;
their characteristic is the
abundance of olivine...
- melt. Ideally, the
stratigraphic sequence of an
ultramafic-mafic
intrusive complex consists of
ultramafic peridotites and
pyroxenites with ****ociated chromitite...
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metamorphic mineral derived from
ultramafic rocks along with serpentinite.
Anthophyllite is
formed by the
breakdown of talc in
ultramafic rocks in the
presence of...
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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...
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similar to that of
light motor oil. Most
ultramafic lavas are no
younger than the Proterozoic, with a few
ultramafic magmas known from the
Phanerozoic in...
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intruded these metamorphic rocks, and also
intrusive Early Paleoproterozoic ultramafic rocks. The term
Zoroaster Plutonic Complex is used for all Paleoproterozoic...
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classifications exist for
igneous rock of
unusual compositions, such as
ultramafic rock or carbonatites.
Where possible,
extrusive igneous rocks are also...
