Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A dark igneous rock, having porphyritic texture, in which both the phenocrysts and the matrix consist of hornblende, pyroxene, and biotite.
from The Century Dictionary.
- noun The name given by Gümbel to rocks, considerably varied in lithological character, occurring in dikes in strata of Paleozoic age.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology An uncommon, small-volume ultrapotassic
igneous rock primarily occurring asdikes ,lopoliths ,laccoliths ,stocks and smallintrusions .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The occurrence of low-volatile coal in certain coalfields in India is attributed to the carbonization of coal seams by the intrusion of mica lamprophyre which is a mica-rich ultrabasic rock containing altered olivine, calcite (or dolomite), bronze-coloured mica and apatite.
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In Fergus County, Montana, they are mined from decomposed dikes of lamprophyre (a basic igneous rock).
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The diamond-bearing lamprophyre breccia is coincident with a crudely circular magnetic low as defined by an airborne magnetic survey.
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- Moreover, a zone of lamprophyre dykes and lamprophyric breccias has been delineated within a
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Drillholes LR-026 and LR-027 show the halo mineralization is concentrated at the intersection of northwest oriented lamprophyre dike and northeast trending fractured zone.
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- This diamond discovery was from a multi-phased xenolith-bearing lamprophyre dyke system, approximately 6 metres wide in its surface exposure.
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- A 9.3 kilogram sample of lamprophyre core from one of the drill holes contained 4 macro-diamonds, the largest being 1. 36mm by 1. 20mm by 1. 12mm, and 91 micro-diamonds.
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Exploration by IMMC has focused on only two of the more than 20 known lamprophyre zones.
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This is strikingly similar to the Company's "Mockingbird" Gold Property geology, where the gold is also hosted in lower plate Precambrian gneiss, and is frequently associated spatially with lamprophyre dikes.
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Follow up work will focus on assessment of priority kimberlite targets and additional evaluation of the most prospective of the lamprophyre breccias.
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