Lamprophyre - Wikipedia
Lamprophyres (from Ancient Greek λαμπρός (lamprós) 'bright' and φύρω (phúrō) 'to mix') are uncommon, small-volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, …
Lamprophyre | Properties, Composition and Formation - Geology …
2019年5月11日 · Lamprophyre is ultrapotassic igneous rock that is occurring as dikes, lopoliths, loccoliths, stocks and small intrussion. It is alkaline silica-undersaturated mafic or ultramafic …
Lamprophyres - ALEX STREKEISEN
A rare variety of ultramafic lamprophyre consisting of combinations of forsteritic olivine, diopsidic pyroxenes, various amphiboles and phlogopite in a matrix of similar minerals with abundant …
Lamprophyre | Igneous, Mafic & Ultramafic | Britannica
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 porphyritic …
Lamprophyres – Geology is the Way
Lamprophyres (from the Greek lampros, ‘glistening’ + porphyros ‘porphyry’) are rare and poorly understood ultrapotassic hypabissal rocks that occur only as dikes. Even though they share …
Lamprophyre - an overview | ScienceDirect Topics
Lamprophyre is defined as a type of porphyritic dyke rock characterized by phenocrysts of solely mafic minerals, such as biotite or amphibole, with feldspars and/or feldspathoids limited to the …
Lamprophyres, lamproites and related rocks as tracers to …
Lamprophyres, lamproites and related rock types (e.g. kimberlites, orangeites and shoshonites) represent mantle-derived, volatile-rich rocks situated both in craton and off-craton settings that …
The nature and origin of lamprophyres: some definitions, distinctions ...
1977年9月1日 · Lamprophyres are porphyritic dyke-rocks, readily recognisable in the field, which seemed to have become enveloped in petrological mystery because of their scattered and …
The term 'lamprophyre' was coined by GUmbel (1874), making it one of petrography's oldest; in fact it predates such fashionable wunderkinden as komatiite and ophiolite by a full century.
What are Lamprophyres? — History, Definitions, Classification
To an uncomfortably large number of geologists, the term ‘lamprophyre’ conjures up predominantly negative images: of rotten dykes forming miniscule, impersistent outcrops; of …