- 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...
- ****s or
sills consist either of phonolite, tinguaite,
lamprophyre micromalignite,
lamprophyre micromelteigite, or carbonatite. The
Beemerville Alkaline...
- diorites,
lamprophyres, alkali-syenites and rhyolites. The
parent gabbroic magma is
shown to have
given rise in
sequence to diorites,
lamprophyres and alkali-syenites...
-
continental crust above upwelling mafic magma, such as at rift zones.
Lamprophyres and
melilitic rocks Kimberlite Lamproite Orangeite (see
Group II kimberlite)...
-
otherwise inaccessible mantle. Basalts, kimberlites,
lamproites and
lamprophyres,
which have
their source in the
upper mantle,
often contain fragments...
- rock Lamproite –
Mantle rock
expulsed to the
surface in
volcanic pipes Lamprophyre – Type of ultrapot****ic
igneous rock – An ultramafic, ultrapot****ic intrusive...
-
greater than 90% amphiboles,
which have a
feldspar groundm****, may be
lamprophyres.
Metamorphic rocks composed primarily of amphibole, plagioclase, with...
- the
Southern Kerguelen Plateau, the
Rajmahal Traps/Indian
lamprophyres,
Antarctic lamprophyres, and the
Central Kerguelen Plateau/Broken Ridge. In the late...
-
classified as
diabases or dolerites. Rare
ultramafic hypabyssal rocks called lamprophyres have
their own
classification scheme.
Intrusive rocks are characterized...
- 132–128 Ma; the
Rajmahal Traps in
Northeast India 118–117 Ma; and
finally lamprophyres in
India and
Antarctica 115–114 Ma. The
oldest Australian volcanism that...
