Lamprophyres (from Ancient Greek λαμπρός (lamprós) 'bright', and φύρω (phúrō) 'to mix') are uncommon, small-volume ultrapotassic igneous rocks primarily...

rock Lamproite – Mantle rock expulsed to the surface in volcanic pipes Lamprophyre – Ultrapotassic igneous rocks – An ultramafic, ultrapotassic intrusive...

dikes or sills consist either of phonolite, tinguaite, lamprophyre micromalignite, lamprophyre micromelteigite, or carbonatite. The Beemerville Alkaline...

considered "ultramafic". Ultrapotassic, ultramafic igneous rocks such as lamprophyre, lamproite and kimberlite are known to have reached the surface of the...

otherwise inaccessible mantle. Basalts, kimberlites, lamproites and lamprophyres, which have their source in the upper mantle, often contain fragments...

equivalent, rhyolite. Biotite is an essential phenocryst in some varieties of lamprophyre. Biotite is occasionally found in large cleavable crystals, especially...

occurrences are as masses adjacent to ultramafic intrusives, associated with lamprophyre dikes and as large crystals in pegmatites. It commonly occurs as a detrital...

northern apophysis, the lamprophyres and the dark inclusions. The clear-cut distinction of the microgranites and the lamprophyres from the other facies...

forms. Other rock types present include: alkali basalt, nephelinite, lamprophyre, and carbonatite. Mantle xenoliths have been described from Kachchh (northwestern...

microdiamonds in the island arc of Japan are found in a type of rock called lamprophyre. Kimberlites can be found in narrow (1 to 4 meters) dikes and sills,...

A dike of lamprophyre near the Shiprock volcanic plug, New Mexico, that has resisted the erosion that removed some of the softer rock into which the dike...

time. Lamproite – Mantle rock expulsed to the surface in volcanic pipes Lamprophyre – Ultrapotassic igneous rocks Nepheline syenite – Holocrystalline plutonic...

proposed, but differences in chemistry mean this remains uncertain. Lamprophyre dykes of Late Permian age are found throughout Orkney. Glacial striation...

begins by determining if the rock is ultramafic, a carbonatite, or a lamprophyre. An ultramafic rock contains more than 90% of iron- and magnesium-rich...

Line district, in kimberlite in the Iron Mountain district, Wyoming, in lamprophyre at Cedar Mountain in Wyoming, and in numerous anthills and outcrops of...

volcanic breccia and black dikes of igneous rock called minette, a type of lamprophyre. It is the erosional remnant of the throat of a volcano, and the volcanic...

kimberlites in Colorado, from the Bishop Conglomerate and in a Tertiary age lamprophyre at Cedar Mountain in Wyoming. A variety of pyrope from Macon County,...

phenocryst and groundmass phase within ultrapotassic igneous rocks such as lamprophyre, kimberlite, lamproite, and other deeply sourced ultramafic or high-magnesian...

volcanic rocks associated with this rise are tholeiitic lavas and intrusive lamprophyre sheets, which form a volcanic basement, on average, 50 m (160 ft) below...

in ultrapotassic igneous rocks such as kimberlites, carbonatites, and lamprophyre, owing to the unusual magma genesis of these rocks.[citation needed]...

diorites, lamprophyres, alkali-syenites and rhyolites. The parent gabbroic magma is shown to have given rise in sequence to diorites, lamprophyres and alkali-syenites...

subsequently cools and solidifies, it forms unusual potassic rock such as lamprophyre, lamproite, or kimberlite. When enough rock is melted, the small globules...

orthogneisses. On the west face of Broad Peak and the south spur of K2, lamprophyre dikes, which consist of clinopyroxene and biotite-porphyritic vogesites...

continental crust above upwelling mafic magma, such as at rift zones. Lamprophyres and melilitic rocks Kimberlite Lamproite Orangeite (see Group II kimberlite)...

IUGS rules. Kimberlite – Igneous rock which sometimes contains diamonds Lamprophyre – Ultrapotassic igneous rocks Ultrapotassic igneous rocks – Class of...

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...

greater than 90% amphiboles, which have a feldspar groundmass, may be lamprophyres. Metamorphic rocks composed primarily of amphibole, plagioclase, with...

surface of the water and includes 700 meters of tholeiitic lavas and lamprophyre sheets dated to 33 million years ago. The oceanic crust around the island...

Archaean age is found locally. Igneous intrusions of dolerite, felsite, lamprophyre and diorite of Palaeozoic age are encountered in places. The eastern...

and they seem to bear a complementary relationship to certain types of lamprophyre dikes. Though nowhere very common they have a wide distribution with...