Results 281 to 290 of about 87,697 (345)

A potential mantle origin for precursor rocks of high-Mg impact glass beads in Chang'e-5 soil. [PDF]

Sci Adv
Ding CL, Nemchin A, Johnson T, Norman MD, Guan Y, Tian LL, Xie WL, Li LS, Zhou SD, Xu KX, Wang XL.   +10 more
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Electron microprobe study of lunar and planetary zoned plagioclase feldspars: An analytical and experimental study of zoning in plagioclase

, 1982
Robert K. Smith, G. E. Lofgren
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Role of micropores, mass transfer, and reaction rate in the hydrothermal alteration process of plagioclase in a granitic pluton

American Mineralogist, 2019
This paper describes the plagioclase alteration process with a focus on the role of micropores, mass transfer, and reaction rate in the Toki granitic pluton in central Japan.
T. Yuguchi, Kaho Shoubuzawa, Yasuhiro Ogita, K. Yagi, M. Ishibashi, E. Sasao, T. Nishiyama   +6 more
semanticscholar   +1 more source

Plagioclase disequilibrium induced during fluid‐absent biotite‐breakdown melting in metapelites

Journal of Metamorphic Geology, 2018
In the Bandelierkop Quarry (South Marginal Zone of the Limpopo belt), two generations of leucosome contain peritectic garnet produced by incongruent melting of biotite‐bearing assemblages, either in the presence or absence of sillimanite, respectively ...
Nonkuselo Madlakana, G. Stevens
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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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