rock Lamproite – Mantle rock expulsed to the surface in volcanic pipes Lamprophyre – Ultrapotassic igneous rocks – An ultramafic, ultrapotassic intrusive... 14 KB (2,211 words) - 23:33, 16 April 2024 |
dikes or sills consist either of phonolite, tinguaite, lamprophyre micromalignite, lamprophyre micromelteigite, or carbonatite. The Beemerville Alkaline... 9 KB (1,104 words) - 16:33, 29 October 2023 |
otherwise inaccessible mantle. Basalts, kimberlites, lamproites and lamprophyres, which have their source in the upper mantle, often contain fragments... 7 KB (771 words) - 11:39, 28 October 2023 |
Piégut-Pluviers Granodiorite (section Lamprophyre) northern apophysis, the lamprophyres and the dark inclusions. The clear-cut distinction of the microgranites and the lamprophyres from the other facies... 22 KB (2,533 words) - 21:35, 11 August 2023 |
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... 48 KB (5,657 words) - 16:36, 13 April 2024 |
in ultrapotassic igneous rocks such as kimberlites, carbonatites, and lamprophyre, owing to the unusual magma genesis of these rocks.[citation needed]... 29 KB (3,034 words) - 07:39, 12 April 2024 |
greater than 90% amphiboles, which have a feldspar groundmass, may be lamprophyres. Metamorphic rocks composed primarily of amphibole, plagioclase, with... 9 KB (1,012 words) - 14:30, 9 January 2024 |
IUGS rules. Kimberlite – Igneous rock which sometimes contains diamonds Lamprophyre – Ultrapotassic igneous rocks Ultrapotassic igneous rocks – Class of... 11 KB (1,074 words) - 04:24, 4 January 2024 |
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... 2 KB (231 words) - 02:31, 24 November 2023 |
Archaean age is found locally. Igneous intrusions of dolerite, felsite, lamprophyre and diorite of Palaeozoic age are encountered in places. The eastern... 27 KB (2,859 words) - 23:31, 3 March 2024 |