Results 111 to 120 of about 16,578 (144)

Composition of Phlogopite From Ultramafic Lamprophyres as an Indicator of Formation Conditions (Zima Alkaline Ultramafic Carbonatite Complex, Southern Siberian Craton)

Russian Geology and Geophysics
Abstract ––The paper presents data on the age and composition of phlogopite from dikes of ultramafic lamprophyres (aillikites) of the Zima Complex located within the Urik–Iya graben in the East Sayan region (southern margin of the Siberian craton).
A G Doroshkevich
exaly   +2 more sources

Alteration in Ultramafic Lamprophyres and Its Control on REE Distribution in Western Kentucky

Geological Society of America Abstracts with Programs, 2023
Zachary Walton, Georgina Lukoczki, Craig Dietsch   +2 more
exaly   +2 more sources

Olivine in Ultramafic Lamprophyres: Chemistry, Crystallisation, and Melt Sources of Siberian Pre- and Post-Trap Aillikites

Contributions To Mineralogy and Petrology, 2018
We studied olivines from the Devonian pre-trap (the Ilbokich occurrence) and the Triassic post-trap (the Chadobets occurrence) carbonate-rich ultramafic lamprophyres (UMLs) in the southwestern portion of the Siberian craton. On the basis of detailed investigations of major, minor, and trace-element distributions, we have reconstructed the main ...
Anna Nosova, Alexey Vladimirovich Kargin, A V Lapin   +2 more
exaly   +2 more sources

Polygenic Nature of Olivines From the Ultramafic Lamprophyres of the Terina Complex (Chadobets Upland, Siberian Platform) Based on Trace Element Composition, Crystalline, and Melt Inclusion Data

Minerals (Basel, Switzerland), 2021
Olivine from the deep mantle-derived rocks, such as ultramafic lamprophyres, carries important information about the composition of the mantle source, the processes of mantle metasomatism, the origin of specific silicate-carbonate melts, as well as the ...
Anna G Doroshkevich, Alexey Ragozin, Anastasia E Starikova   +2 more
exaly   +2 more sources

Alkaline and ultramafic lamprophyres in Italy: Distribution, mineral phases, and bulk rock data

, 2008
Several lamprophyre outcrops occur in Italy paralleling the European cycles. Lamprophyre occurrences from the lower Cretaceous to the Oligocene are comprised primarily of dykes and rarely lavas, generally emplaced in isolation. They are ultramafic or alkaline lamprophyres located in eight different places ranging from the eastern Alps to the areas of ...
STOPPA, Francesco
openaire   +2 more sources

Petrogenesis of Ultramafic Lamprophyres From the Terina Complex (Chadobets Upland, Russia): Mineralogy and Melt Inclusion Composition

Minerals (Basel, Switzerland), 2020
The mineral composition and melt inclusions of ultramafic lamprophyres of the Terina complex were investigated. The rocks identified were aillikites, mela-aillikites, and damtjernites, and they were originally composed of olivine macrocrysts and ...
Anna G Doroshkevich, Anastasia E Starikova, Ilya Prokopyev   +2 more
exaly   +2 more sources

Trace Element and Nd–Sr Isotopic Composition of Ultramafic Lamprophyres From the East Antarctic Beaver Lake Area

Chemical Geology, 2001
The trace element and Nd-Sr isotopic compositions of Cretaceous (110-117 Ma) ultramafic lamprophyres from the Beaver Lake area in East Antarctica, which are developed as sill, dyke and plug intrusions. have been investigated.
S.F Foley, Foley, Stephen F., A.V Andronikov, Andronikov, A. V.   +3 more
exaly   +2 more sources

Alkaline mafic and ultramafic lamprophyres from the Aillik Bay area, Labrador

Canadian Journal of Earth Sciences, 1986
The Aillik Bay lamprophyric dyke swarm comprises abundant sannaites, plus rarer olivine sannaites, aillikites and carbonatites. Sannaites are characterized by phenocrysts of Ti–Al titansalite plus rarer olivine and phiogopite in a groundmass dominated by pyroxene, biotite, titanomagnetite, and K-feldspar.
Foley, SF, King, AF, Malpas, J
openaire   +2 more sources

Geochemistry of Pyroxenitic and Hornblenditic Xenoliths in Alkaline Lamprophyres From the Spanish Central System [PDF]

Lithos, 2006
The alkaline lamprophyres and diabases of the Spanish Central System carry a heterogeneous suite of xenoliths which includes scarce pyroxenitic and hornblenditic types that can be divided in two groups: (a) pyroxenite xenoliths, including spinel ...
Carlos Villaseca, David Orejana
exaly   +2 more sources

Petrology of the ultramafic lamprophyre and associated rocks at Coral Rapids, Abitibi River, Ontario

Canadian Journal of Earth Sciences, 1994
An ultramafic lamprophyre sill and dikes, and an olivine–melilite-rich dike rock intrude Lower to Middle Devonian sediments and low- to high-grade Archean metamorphic rocks on the west bank of the Abitibi River, Coral Rapids, Ontario. Although previously considered to be kimberlitic, all these rocks contain olivine + clinopyroxene + phlogopite ...
A. D. Edgar, L. A. Pizzolato, G. M. Butler   +2 more
openaire   +1 more source