Iron in plagioclase as a monitor of the differentiation of the Skaergaard intrusion
Article Abstract:
Research aimed at estimating the liquid line of descent of the most evolved Skaergaard liquids has involved using the iron content in plagioclases from a drill core around 950 mt long in combination with liquid compositions modelled by incremental bulk-rock summation of Upper Zone cumulates. There was found to be an increase in both the iron content and the silica content of the evolving liquid with fractional crystallization. It was concluded that iron in plagioclases of oxide ferrodiorites of a 950 mt long drill core directly monitors the iron content of the evolving Skaergaard magma.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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Diffusion of lead in plagioclase and K-fledspar: an investigation using Rutherford Backscattering and Resonant Nuclear Reaction Analysis
Article Abstract:
Lead (Pb) isotope diffusion was measured in one K-feldspar and four plagioclases by Rutheford backscattering spectrometry and resonate nuclear reaction analysis. Lead (Pb) to calcium (Ca) exchange takes place during chemical diffusion in calcic plagioclase. The uptake of Pb is related to a decrease in the amount of Ca. In solid plagioclase and K-feldspar, the Pb exchange is a coupled reaction with aluminum (Al). The uptake of Pb and the increase in Al content are related to decrease in the amount of Na and K respectively.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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An experimental study of the effects of melt composition on plagioclase - melt equilibria at 5 and 10 kbar: implications for the origin of magmatic high-An plagioclase
Article Abstract:
The Fourier transform infrared spectroscopic technique aided in assessing water content in glasses coexisting with liquidus or almost liquidus plagioclase and revealed Ca# (Ca/(Ca+Na)*100), Al# (Al/(Al+Si)*100), H2O content and pressure of crystallization as the major influences on liquidus plagioclase composition. Intensity of calcic plagioclase is directly proportional to Ca# and Al# increase and inversely proportional to increase in crystallization pressure.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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