A sequential genetic diagram is proposed for lamprophyres adopting their definitions, classification, petrological and geochemical signatures from an elaborated literature survey. Based on the definition of individual lamprophyric types, the existence of "Lamprophyre clan" of rocks is supported as it was first proposed by Rock in 1991. A …

Lamprophyre, any of a group of dark gray to black intrusive igneous rocks that generally occur as dikes (tabular bodies inserted in fissures). Such rocks are characterized by a …

The only one ultramafic lamprophyre dyke is composed mainly of serpentinized olivine and phlogopite in the talc-carbonate groundmass and similar (to Ingashi lamproites) accessory assemblage with ...

Lamprophyre is a group of ultrapotassic, igneous rocks that consist of phenocrysts of mica - particularly biotite or phlogopite - and amphibole, such as pargasite or hornblende. It also includes smaller quantities of melilite and clinopyroxene. It is an alkaline silica-under-saturated mafic, or ultramfic, rock with high percentages of nickel ...

The Petrology of Lamprophyre Dykes in the Above Rocks Granitoid, Jamaica: Evidence of rifting above a subduction zone during the early Tertiary. Caribbean Journal of Science, vol. 34, no. 1-2, pp. 1-11, 1998. ^ Mitchell, R.H., 1994b. Suggestions for revisions to the terminology of kimberlites and lamprophyres from a genetic viewpoint. In Proc ...

8.2.5 Geochemistry of the Lamprophyres. The whole-rock major- and trace-element geochemistry of the lamprophyres from Goodall gold mine is shown in Table …

1 Citations Abstract To an uncomfortably large number of geologists, the term 'lamprophyre' conjures up predominantly negative images: of rotten dykes forming …

Lamprophyre. melanocratic igneous dike rock that differs from the corresponding igneous rocks to which it is genetically related by its sharply increased content of dark minerals (usually at least 30 percent of the rock). The color of lamprophyre varies from dark gray to black. Its constituents include feldspar (sometimes feldspathoid) and dark ...

N. Rock. Springer Science & Business Media, Dec 6, 2012 - Science - 285 pages. Following their recognition by Gumbel (1874), lamprophyres were treated for an entire century as little more than obscure curiosities. Although this situation has changed recently, with a flowering of publications and active workers, lamprophyres remain almost …

Field photographs and photomicrographs of some Indian lamprophyres. (A) A lamprophyre dyke in the Gondwana coal fields (Chhoti Nadi) exposed in a river cutting; (B) A shoshonitic lamprophyre dyke ...

The end-Cretaceous (ca. 66 Ma) Phenaimata alkaline igneous complex, associated in space and time with the Deccan large igneous province (LIP) in Western India, consists of bimodal (tholeiitic to alkaline) differentiated plutonic to volcanic igneous rocks. Mineralogy and petrology of variably fractionated alkaline lamprophyre and dolerite …

Abstract. Lamprophyre is one of the most important probes to understand the enrichment and depletion processes of the lithospheric evolution. In this research, one lamprophyre site (Liguo), which is the nearest lamprophyre to the South China Block (SCB) ever discovered in North China Craton (NCC), had been used to analysis the …

In Khanozai–Muslim Bagh area, NW Pakistan, the sills are intruded into mainly Triassic–Jurassic successions of Indian platform sediments. They are petrographically identified as dolerite and lamprophyre. The dolerite is a normal dolerite and olivine dolerite and is altered compared with lamprophyre. Lamprophyre is classified as …

A Selective Lamprophyre Bibliography. N. M. S. Rock; Pages 157-213. Back Matter. Pages 214-285. PDF Back to top About this book. Following their recognition by GUmbel (1874), lamprophyres were treated for an entire century as little more than obscure curiosities. Although this situation has changed recently, with a flowering of publications and ...

In all geological periods, lamprophy occurs. Archaicexamples are usually associated with goldreserves. Among the Cenozoicexamples, the magnesian rocks in Mexico and South America and the youngultramafic lamp lamps from Gympie in Australia are 18.5% MgO at ~ 250 Ma. Rock …

We report rare occurrence of lamprophyre xenoliths within a host lamprophyre from the Dongargaon area, Deccan Large Igneous Province, NW India. The lamprophyre xenoliths are distinct in texture (grain size) as well in mineralogy from those of their host rock. The clinopyroxene (diopside) in the xenoliths is depleted in Ca and Mg …

Dark, lustrous rocks with mafic phenocrysts occurring in the Fichelgebirge, W Germany, were called lamprophyre (shining porphyries) by C. W. von Gümbel. A few pre-existing names, some still in use, were incorporated by him in the new term. Later, Rosenbusch (1887) included it in his systematic classification as a group name for rocks with ...

Contrary to the commonly accepted notion that the lithosphere in NE China thinned from the Late Jurassic through to the Early Cretaceous period, we report the discovery of a thickening episode in the backdrop of this long-term thinning. A series of lamprophyre dikes have been recently discovered in the Tuquan Basin of the western …

Lamprophyre dykes and sills are common throughout the Western European Variscan realm from England and France to Germany, Czech Republic, Poland, and Spain (Fig. 1).The lamprophyric occurrences also extend north of the Variscan orogenic front in Scotland, Norway, and Sweden (Kirstein et al. 2006).The widespread dyke and sill …

Lamprophyres (Greek λαµπρός (lamprós) = "bright" and φύρω (phýro) = to mix) are uncommon, small volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions. They are alkaline silica-undersaturated, ultramafic rocks with high magnesium oxide, >3% potassium oxide, high sodium oxide and high …

The term "lamprophyre", from " lampros " and " porphyros " (glistening porphyry), was introduced by von Gumbel in 1874 for a group of dark rocks that form minor intrusions, …

Numerous dykes of ultramafic lamprophyre (aillikite, mela-aillikite, damtjernite) and subordinate dolomite-bearing carbonatite with U–Pb perovskite emplacement ages of ∼590–555 Ma occur in the vicinity of Aillik Bay, coastal Labrador. The ultramafic lamprophyres principally consist of olivine and phlogopite phenocrysts in a …

It is argued that all ultramafic lamprophyre rock types can be related to a common magma type which differs in important petrogenetic aspects from kimberlites, orangeites, olivine lamproites and the remainder of lamprophyres such as alkaline and calc-alkaline varieties. Ultramafic lamprophyres can be readily distinguished from olivine ...

The lamprophyre dyke is defined by the presence of magmatic as well as xenocrystic phlogopites and clinopyroxenes. New 40 Ar/ 39 Ar ages of phlogopites from the dyke reveal two distinct ages of 65.4 and 68.1 Ma. …

Abstract. In order to study the weakening mechanism and mechanical behaviors of hard lamprophyre of Carboniferous Permian coal-bearing strata in China's mining area, lamprophyre samples were subjected to static rock dissolution experiments with pH values of 0, 2, and 4. The acid corrosion mechanism of lamprophyre was revealed from the …