Results 201 to 210 of about 59,128 (262)

Integrated remote sensing and petrological study of garnet-bearing rocks in the Arabian-Nubian shield: a case study from Wadi Shait-Wadi Gemal area, South Eastern Desert, Egypt. [PDF]

Sci Rep
Younis MA, Elyaseer MH, Shahin TM, El-Desoky HM.   +3 more
europepmc   +1 more source

Disequilibrium response to tapping crustal magma reveals storage conditions. [PDF]

Nature
Birnbaum J, Wadsworth FB, Kendrick JE, Kennedy B, Wallace PA, da Silva MM, Hess KU, Lavallée Y.   +7 more
europepmc   +1 more source

Complex eruption processes and deposits of basaltic fissures: insights from the ~37 ka Budj Bim volcanic complex, Southeastern Australia. [PDF]

Bull Volcanol
Kavanagh JL, Chamberlain KJ, Hrintchuk JA, Mariani E, Boyce J, Urbani S, Havard TA, Williams KM, Cas RAF.   +8 more
europepmc   +1 more source

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Micropores in plagioclase

Contributions to Mineralogy and Petrology, 1975
Plagioclase feldspar is often surprisingly porous on a small scale. Pores range in size from less than 1 μm to about 40 μm, and occupy up to 2.3 % by volume. In general, the highest plagioclase porosities occur in rocks which would have had a comparatively “wet” history: normal granites and pegmatites.
Montgomery, Carla W., Brace, W. F.
openaire   +1 more source

Oscillatory Zoning in Plagioclase Feldspar

Science, 1980
A kinetic mathematical model of crystal growth from the melt is used to describe quantitatively the phenomenon of oscillatory zoning in plagioclase feldspar. In this model, the functional dependence of crystal growth rate on both melt and crystal surface composition and the transport of material within the melt are explicitly considered.
C S, Haase, J, Chadam, D, Feinn, P, Ortoleva   +3 more
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Crystallography of Some Lunar Plagioclases

Science, 1970
Crystals of calcic bytownite from type B rocks have space group C 1̅ with c ≈ 14 angstroms. Bytownite crystals from type A rocks are more sodic and have space group C 1̅, c ≈ 7 angstroms.
D B, Stewart, D E, Appleman, J S, Huebner, J R, Clark   +3 more
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Partial Melting Reactions of Plagioclases and Plagioclase-Bearing Systems

1994
The kinetics of partial melting were studied in the systems: $$\begin{gathered} \begin{array}{*{20}c} {Ab - An} & {{\text{ }}\left( {P = 1{\text{ }}atm} \right)} \\ \end{array} \hfill \\ \begin{array}{*{20}c} {Ab - An - H_2 O} & {{\text{ }}\left( {P = 5{\text{ }}kbar} \right)} \\ \end{array} \hfill \\ \begin{array}{*{20}c} {Qz - Ab - An - H_2 O} & {
W. Johannes, J. Koepke, H. Behrens
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Plagioclase—melt equilibria

Geochimica et Cosmochimica Acta, 1976
Results of experiments investigating the crystallization of plagioclase from natural and synthetic melts are presented and are analyzed in terms of empirical and semiquantitative mixing models for the melt. Elemental partition constants were determined from the results and from other published data.
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An igneous plagioclase thermometer

Contributions to Mineralogy and Petrology, 1970
An empirical approach has been taken to develop a geothermometer based on plagioclase-magmatic liquid equilibrium. Compositions of coexisting plagioclase and liquid (glass) obtained by electron microprobe analysis of quenched samples from equilibrium melting experiments of natural granitic rocks at water pressures of 0.5 and 1.0 kilobars have been used
Kudo, Albert M., Weill, Daniel F.
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Cation Diffusion in Plagioclase Feldspar

Science, 1984
Steep compositional gradients in igneous plagioclase feldspar from slowly cooled intrusive bodies imply a maximum value of the intracrystalline diffusion coefficient for NaSi ⇄ CaAl exchange, D max ∼10 -20 centimeters squared per second for temperatures in the range 1250° to 1000°C ...
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