Results 191 to 200 of about 26,385 (251)

Multiple mush generations provide insight into the longevity of open-conduit basaltic volcanoes. [PDF]

Sci Rep
Schiavon B, Petrone CM, Forni F, Pontesilli A, Hu H, Scarlato P, Andronico D, Bello ED, Nazzari M, Mollo S.   +9 more
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Mantle melting and lithospheric structure beneath eastern Australia's Cenozoic volcanoes from 3D magnetotellurics. [PDF]

Sci Rep
Margiono R, Heinson G.
europepmc   +1 more source

Mineral Phase-Resolved Quantification in LA-ICP-MS Imaging. [PDF]

Anal Chem
Umfahrer B, Buday J, Pořízka P, Kaiser J, Garofalo PS, Günther D.   +5 more
europepmc   +1 more source

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Mechanism of plagioclase albitization

Journal of Sedimentary Research, 1992
Abstract Observations of closely spaced porous and cemented sandstones from the San Joaquin basin, the Los Angeles basin and the Gulf Coast reveal that albitization of plagioclase occurs during fracturing of the detrital plagioclase grains.
Ramseier, Karl, Boles, J.R., Lichtner, P.C.   +2 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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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.
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The structures of the plagioclase felspars: VI. Natural intermediate plagioclases

Mineralogical Magazine and Journal of the Mineralogical Society, 1956
SummarySpecimens from some forty different localities over the composition range from about 20 % An to about 70 % An have been examined by X-ray single-crystal methods. The majority of these specimens show the normal intermediate plagioclase pattern characterized by weak pairs of subsidiary layer-lines of variable separation. It has been found that the
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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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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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The structures of the plagioclase felspars: VII. The heat treatment of intermediate plagioclases

Mineralogical Magazine and Journal of the Mineralogical Society, 1956
SummaryPrevious work has established that natural ‘low-temperature’ intermediate plagioclases show single-crystal diffraction patterns in which the subsidiary reflections are split into two; the separation of these split reflections appears to be dependent on the composition of the felspar. Several of these specimens have been subjected to varying heat
P. Gay, M. G. Bown
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