Results 171 to 180 of about 1,350 (208)
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Postorogenic lamprophyres of the Kadaya ores
International Geology Review, 1968The hydrothermal lead-zinc ores of the Kadaya were deposited during the intermission between two intrusions of lamprophyric magma, presumably from the same hearth. – V. P. Sokoloff.
N.G. Kudryavtseva +2 more
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Fluorine in lamprophyre and lamproid rocks
Geochimica et Cosmochimica Acta, 1968Abstract The fluorine content has been determined for 80 igneous dyke rocks (mostly lamprophyre and lamproid rocks; rarely alkaline and strongly acid ones) from two areas at the eastern margin of the Bohemian Massif. The main carriers of fluorine are biotite and amphibole.
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Phosphorus in lamprophyre and lamproid rocks
Contributions to Mineralogy and Petrology, 1972The P2O5-content of 300 samples of lamprophyre, lamproid and some acid dyke rocks from three areas of the Bohemian Massif has been determined colorimetrically. The values established range from 0.02% in microgranite to 2.38% in an alkaline minette. A negative correlation exists between P2O5 and SiO2, and Al2O3, respectively, a positive one between P2O5
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Mineralogical Magazine and Journal of the Mineralogical Society, 1963
SummaryIn the Carboniferous-Permian dyke-suite north of Loch Sunart, Argyll, a complete gradation is displayed from olivine-dolerite to camptonite. The dolerites are more numerous than the camptonites, and dykes of monchiquite are rare. A small number of minettes and allied lamprophyre types of Devonian age are also present. New analyses of biotite and
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SummaryIn the Carboniferous-Permian dyke-suite north of Loch Sunart, Argyll, a complete gradation is displayed from olivine-dolerite to camptonite. The dolerites are more numerous than the camptonites, and dykes of monchiquite are rare. A small number of minettes and allied lamprophyre types of Devonian age are also present. New analyses of biotite and
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The carbonate fraction in carbonatitic Italian lamprophyres
Lithos, 2005Abstract Alkaline and ultramafic lamprophyres represent the majority of pre-Pleistocene alkaline mafic magmatic activity in Italy and have been described from several localities. The age of magmatism ranges from Triassic to Lower Oligocene. Some contain appreciable amounts of carbonate.
VICHI G., STOPPA, Francesco, WALL F.
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The South Hill Lamprophyre, Jersey
Geological Magazine, 1936A Brief account of this dyke was published in 1933, but since that time further studies, with assistance from Dr. A. E. Mourant and Mr. A. J. Robinson, have been made, and the results seem to be of sufficient value to justify a return to the subject.
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The nature and origin of lamprophyres: an overview
Geological Society, London, Special Publications, 1987SummaryLamprophyres are ‘alkaline rocks’ because they carry high alkalis at a given percentage of SiO2, together with one or more of normativene, lcorac, modal foids, and Na-K-Ti-rich amphiboles or pyroxenes. They reach higher whole-rock H2O, CO2, Sr and Ba contents than other silicate igneous rocks.
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Nature, Origin and Evolution of Lamprophyre Melts
1991Petrogenetic theories for lamprophyres are legion, largely of historical interest, and are reviewed by Rock (1977, 1984, 1986, 1987a, 1989a), R.H.Mitchell (1986) and Bergman (1987). This chapter concentrates on: (1) the nature of lamprophyre liquids; (2) genetic unity and diversity; (3) the probability that lamprophyres represent primary melts ...
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