- America, and
young ultramafic lamprophyres from
Gympie in
Australia with 18.5% MgO at ~250 Ma.
Modern science treats lamprophyres as a catch-all term for ultrapot****ic...
- rock Lamproite –
Mantle rock
expulsed to the
surface in
volcanic pipes Lamprophyre – Ultrapot****ic
igneous rocks – An ultramafic, ultrapot****ic intrusive...
-
otherwise inaccessible mantle. Basalts, kimberlites,
lamproites and
lamprophyres,
which have
their source in the
upper mantle,
often contain fragments...
- diorites,
lamprophyres, alkali-syenites and rhyolites. The
parent gabbroic magma is
shown to have
given rise in
sequence to diorites,
lamprophyres and alkali-syenites...
-
greater than 90% amphiboles,
which have a
feldspar groundm****, may be
lamprophyres.
Metamorphic rocks composed primarily of amphibole, plagioclase, with...
- is
encountered as a
primary igneous phenocryst within lamproites and
lamprophyres, the
result of
highly fluid-rich melt
compositions within the deep mantle...
-
continental crust above upwelling mafic magma, such as at rift zones.
Lamprophyres and
melilitic rocks Kimberlite Lamproite Orangeite (see
Group II kimberlite)...
- the
Southern Kerguelen Plateau, the
Rajmahal Traps/Indian
lamprophyres,
Antarctic lamprophyres, and the
Central Kerguelen Plateau/Broken Ridge. In the late...
-
considered "ultramafic". Ultrapot****ic,
ultramafic igneous rocks such as
lamprophyre,
lamproite and
kimberlite are
known to have
reached the
surface of the...
-
classified as
diabases or dolerites. Rare
ultramafic hypabyssal rocks called lamprophyres have
their own
classification scheme.
Intrusive rocks are characterized...
