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, laccoliths, stocks, and small intrusions.
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 rocks with high magnesium oxide, >3% potassium oxide, high sodium oxide and high nickel and chromium.
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 texture in which large crystals (phenocrysts) of dark, iron-magnesium (mafic) minerals are enclosed in a.
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 groundmass.
Lamprophyres, lamproites and related rocks: Tracers to …
2023年3月28日 · Potassium-rich rocks, including lamprophyres, lamproites, orangeites and kimberlites, form a fascinating group of volatile-rich igneous group that occur in diverse tectonic regimes. In spite of their small volume, they far outweigh the other groups in diversity and rock names due to their inherent heterogeneity and diverse petrogenesis.
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 are genetically linked with individual phases of the amalgamation and break-up of former supercontinents.
Because lamprophyres are abundant in Germany and Switzerland, where they were first recognized (Chapter 2), they received much attention in these countries during the closing decades of the 19th century, culminating in an influential exposition by Rosenbusch (1897).
What are Lamprophyres? — History, Definitions, Classification
Abstract. To an uncomfortably large number of geologists, the term ‘lamprophyre’ conjures up predominantly negative images: of rotten dykes forming miniscule, impersistent outcrops; of legion obscure rock-types named after equally obscure European villages.
The nature and origin of lamprophyres: an overview
Lamprophyres are far more common than generally stated, occurring worldwide in more tectonic settings than many other alkaline rocks and throughout the geological record. They may approximate intratelluric magma compositions. Nearly all represent primitive magmas, and many represent primary magmas.
(PDF) Lamprophyres, lamproites and related rocks as tracers to ...
2021年10月20日 · Proterozoic to Cenozoic lamprophyres, lamproites and related rock types hold a unique potential for the investigation of processes affecting mantle reservoirs.
- 某些结果已被删除